full-color emission of quantum-dot
introduction of quantum dot量子点技术介绍(附演讲稿)-半导体物理全英文展示
Introuction
Nanoscale crystals<=100nm Diameter of ≈10 to 50 atoms Contains 100 - 100,000 atoms
Introuction
Emission spectrum controlled by size Larger QDs emit longer wavelengths Smaller QDs emit shorter wavelengths
4. From our course, we know it’s nano scale size make quantum dots so special. The important point is Bohr diameter. These data is cited form our course slides. In this kind of single point, carriers are constrained strongly. So they have discrete, quantized energy levels, according to the laws of quantum theory. It is a bit like individual atoms, sometimes known as "artificial atoms."
Fluorescence mages for the detection of CEA
Conclusion
Nanocrystal Size controlling emission color Optical, biomedical research application
量子点具有量子力学的
量子点具有量子力学的英文回答:Quantum dots exhibit quantum mechanical effects due to their nanoscale dimensions. These effects include:Quantization of energy levels: The energy levels of electrons in quantum dots are discrete, meaning they can only occupy certain specific energies. This is in contrast to the continuous energy levels of electrons in bulk materials.Tunable bandgap: The bandgap of a quantum dot is the energy difference between the valence band and the conduction band. The bandgap of a quantum dot can be tuned by changing the size of the dot. This allows quantum dots to be used in a variety of optoelectronic applications.Enhanced optical properties: Quantum dots have enhanced optical properties, such as high photoluminescenceefficiency and narrow emission spectra. These properties make quantum dots ideal for use in applications such as light-emitting diodes (LEDs), lasers, and solar cells.中文回答:量子点由于其纳米尺度的尺寸而表现出量子力学效应。
量子点在显示应用中的研究进展
第 38 卷第 7 期2023 年 7 月Vol.38 No.7Jul. 2023液晶与显示Chinese Journal of Liquid Crystals and Displays量子点在显示应用中的研究进展林永红,黄文俊,张胡梦圆,刘传标,刘召军*(南方科技大学电子与电气工程系,广东深圳 518055)摘要:量子点因具有量子产率高、吸收范围宽、发光光谱窄、发光波长可调等优异的光电特性,使其在显示中展现出巨大的应用前景。
化学溶液法合成的量子点不仅具有制备工艺简单和成本低廉等优势,而且也可通过多种方式实现高分辨率的显示器件。
量子点优异的电致发光和光致发光特性,使其在显示领域具有重要的研究价值。
电致发光的量子点发光二极管,在材料合成和器件结构的研究都获得了快速的发展,为实现商业化的显示器件提供了必要基础。
利用量子点的光致发光显示器件获得了更广的色域,呈现出了更丰富的视觉效果。
本文从量子点的特性、电致发光和光致发光出发,介绍了量子点在显示中的应用,总结了量子点器件的研究现状,分析了在器件发展中存在的问题。
关键词:量子点;电致发光;光致发光;显示中图分类号:TN383;O482.31 文献标识码:A doi:10.37188/CJLCD.2022-0265Research progress of quantum dots in display applicationsLIN Yong-hong,HUANG Wen-jun,ZHANGHU Meng-yuan,LIU Chuan-biao,LIU Zhao-jun*(Department of Electronic and Electrical Engineering, Southern University of Science and Technology,Shenzhen 518055, China)Abstract: The excellent optoelectronic characteristics of quantum dots, such as high quantum yield, wide absorption range, narrow emission spectrum and adjustable emission wavelength, make them show great application prospects in displays.Quantum dots synthesized by chemical-solution methods not only have the advantages of a simple preparation process and low cost, but also can be used to achieve high-resolution displays in various ways. The excellent electroluminescence and photoluminescence of quantum dots make them play an important role in the research of displays.Electroluminescent quantum-dot light-emitting diodes have achieved a rapid development in the research of material synthesis and device structure, which provides a foundation for the realization of commercial displays. The displays using the photoluminescence of quantum dots have attained a wider color gamut and presented a richer visual effect. This paper introduces the characteristics, electroluminescence and photoluminescence of quantum dots, and their applications in displays, summarizes the research status of quantum-dot devices, and analyzes the existing problems in the 文章编号:1007-2780(2023)07-0851-11收稿日期:2022-11-12;修订日期:2022-12-03.基金项目:广东省基础与应用基础研究基金(No.2021B15113001);深圳市科技计划项目(No.KQTD20170810110313773,No.JCYJ20190812141803608)Supported by Fundamental and Applied Fundamental Research Fund of Guangdong Province (No.2021B1515130001);Shenzhen Science and Technology Program (No.KQTD20170810110313773,No.JCYJ20190812141803608)*通信联系人,E-mail: liuzj@第 38 卷液晶与显示development of quantum-dot devices.Key words: quantum dots; electroluminescence; photoluminescence; displays1 引言在科技日新月异的今天,显示设备作为一种信息交换媒介,在现代信息化社会占有越来越重要的地位,无论是最初的阴极射线管(Cathode Ray Tube,CRT)显示器、液晶显示器(Liquid Crystal Display,LCD)和发光二极管(Light-Emitting Diode,LED),还是如今的有机发光二极管(Organic Light-Emitting Diode,OLED)、量子点发光二极管(Quan‑tum Dot Light-Emitting Diode,QLED)、Mini Light-Emitting Diode (Mini-LED)和Micro Light-Emit‑ting Diode (Micro-LED)。
研究团队:铯铅卤化物的量子点使LED更亮、反应速度更快
研究团队:铯铅卤化物的量子点使LED更亮、反应
速度更快
为了激发更多颜色的光,科学家一直在研究量子点(Quantum Dots,DQ),而有瑞士研究团队发现铯铅卤化物(Caesium Lead Halide)的量子点可以使得LED更亮、点亮速度更快。
量子点是一种纳米微晶体(Nanocrystal)半导体材质,其直径仅有
2~10nm,相当于10~50个原子宽度而已。
瑞士研究团队研发出的纳米微晶体是由铯铅卤化物组成,并以钙钛矿晶格(Perovskite Lattice)排列。
研究人员之一的苏黎世联邦理工学院教授Maksym Kovalenko表示,这种纳米微晶体受光子激发后可以快速发光。
Kovalenko借由改变纳米微晶体的组成和大小,可以激发出不同波段的可见光,并应用于LED和显示器。
根据以往的研究,量子点在室温下被激发后,大约20十亿分之一秒(Nanoseconds)后发光;而铯铅卤化物量子点同样在室温下被激发后,大约只要十亿分之一秒就会发光。
相较之下,铅铯卤化物量子点反应速度相当快。
全 quantum dot 技术的应用
全 quantum dot 技术的应用Quantum Dot 晶体管技术是一种新兴的技术,它是通过在晶体管上使用非常小的结构来实现能量量子化。
这种技术已经在许多领域得到广泛应用,如平板显示器、LED灯、太阳能电池、医学成像、生物标记等等。
在本文中,我们将重点探讨全 Quantum Dot 技术的应用。
什么是 Quantum Dot 技术?Quantum Dots是一种类似于半导体晶体管的材料,可以将电能捕获、存储和发射为光能。
这些小小的点状晶体是从半导体材料中创造出来的,其尺寸非常小,只有数分之一微米大小。
由于Quantum Dots 的尺寸非常小,因此可以产生非常高的能量密度。
由此产生的电子能带比传统的半导体晶体管要更高,带宽更宽,因此可以处理更高速的数据。
Quantum Dot 技术在平板显示器中的应用Quantum Dot 技术在平板显示器上的应用非常广泛,大大增强了显示器的色彩和色彩准确度。
平板显示器通常使用 LED 灯来背光,这些LED 的颜色极其单调,无法产生广泛的颜色渲染。
然而,与传统的LED 相比,Quantum Dot 技术能够产生更多颜色的显示,甚至可以显示超过99%的 Adobe RGB 色彩空间。
因此,Quantum Dot 技术在显示器上使用,不仅能够展现更真实的颜色,而且能够提高显示器的色彩准确度。
此外,Quantum Dot 技术还可以帮助显示器节约能源,因为 Quantum Dot 可以更好地控制屏幕的亮度和色彩,进而节约电能。
Quantum Dot 技术在 LED 灯中的应用Quantum Dot 技术也可以在 LED 灯上应用。
传统的 LED 灯只能发出单一的颜色。
然而,Quantum Dot 技术可以使灯泡发出多种颜色,因此可以制作出更真实的照明。
此外,Quantum Dot 技术还可以延长 LED 灯的使用寿命,因为 Quantum Dot 可以提高 LED灯的效率,从而降低灯泡工作时产生的热量。
Hisense Google TV U7系列4K电视65寸说明书
U7 Series Quantum Hisense Google TVModel 65U7Hinches65The entertainment you love. With a little help from Google. Google TV brings together movies, shows, live TV and more from across your apps and subscriptions and organizes them just for you. Discover new things to watch with recommendations based on what you watch and what interests you, from across your subscriptions and content available to you. Ask Google to find movies and shows, answer questions, control smart home devices, and more, with your voice. And with the Google TV app you can watch anywhere, anytime.The 2022 Hisense U7H series is packed with features for tech, content, and gaming fans alike. ULED technology improves picture depth, clarity, color accuracy and motion delivering a unique experience only found in Hisense ULED television sets. The U7H gets a user interface and content upgrade with Google TV which can be accessed hands-free through the in-bezel microphones and, for gamers, there’s not only 480 motion rate but 4k 120Hz variable refresh rate, Dolby Vision Gaming, FreeSyncPremium and auto-low latency game mode to maximize the next-generation console experience. The Hisense U7H’s picture quality and extensive list of features make it one of the most affordable premium televisions available.Game Mode ProAll the most advanced gaming tech, all in this TV. HDMI 2.1 inputs recognize gaming sequences to automatically adjust settings for smooth, uninterrupted play. The automatic low-latency mode (ALLM), 120Hz variable refresh rate (VRR) minimize input lag, screen jitter, and frame tearing.Quantum Dot Wide Color GamutQuantum Dot produces purer, richer, more brilliant and accurate colors than a regular LED TV. Creating over a billion color combinations bring vibrant images to life in a way non-QLED TVs can’t.Dolby Vision ™• Dolby Atmos®Dolby Vision HDR * picture and Dolby Atmos sound are cinema technology for your home. They provide amazing realism you can see and hear in every scene.Peak Brightness/Full Array Local Dimming ZonesThe average TV is 250-350 nits. Anything over 500 nits is extremely good. This television is up-to-1000nits peak brightness across up-to-120 local dimming zones. Above average peak brightness and local dimming are critical to correctly reproducing HDR content.Smooth Motion and 120Hz Native refresh rateSmooth Motion removes the digital ‘noise’ that can affect moving objects. The TV’s native 120Hz refresh rate is the foundation for its 480motion rate. These technologies work in concert to make fast-action scenes to ensure moving objects have minimal blurring.Google AssistantThe Google Assistant* is built into Google TV. Tell it to turn on the lights,change the thermostat, add stuff to your grocery list, or just play that video of your friend falling over for the millionth time. And with universal search, you can even get recommendations with Google TV.Voice RemoteThe voice remote control makes controlling your TV easier. Open apps, turn the volume up or down, search for your favourite shows. And if the actual remote goes missing, use the buttons on the TV to activate ‘Find My Remote’. Works with AlexaThis television works with Alexa through any of your Alexa-enabled devices. Just ask Alexa to switch the TV on or off, change channels and lots more.*Google Assistant-compatible products required to use voice commands*HDR viewing experience will vary by model, content availability and internet connection.4K ULED ™Hisense’s proprietary ULED technologies boost color, contrast, brightness, and motion. This suite of patented hardware and software technologies delivers an engaging and completely unique picture that can only be delivered by Hisense.Dolby Vision GamingThis television can support Dolby Vision for gaming at 4k 120Hz.Bluetooth ™ConnectivityWirelessly connect Bluetooth-compatible soundbars, headphones or stereo components to your TV. This quick and convenient connection eliminates unwanted and unsightly cords while providing a secure connection to your audio source.FilmMaker ModeBy disabling all post-processing (e.g.motion smoothing) and preserving the correct aspect ratios, colors and frame rates, Filmmaker Mode enables your TV to display the movie or television show’s content precisely as it was intended by the filmmaker.Metal Stand, Bezel-less designA bezel-less design gives this television a sleek aesthetic that won’t ‘overpower” the room with an unnecessarily large frame. The metal stand provide sturdysupport for this feature-packed television.Hands Free Voice ControlPut down the remote. Change the channel, find the latest movie, stream your favourite video and more with your voice. The quicker, easier way to find whatever you want to watch.TECHNICAL SPECIFICATIONSAll product, product specifications, and data are subject to change without notice to improve reliability, function, design or otherwise. ©2020Hisense USA, All rights reservedHisense USA Corporation7310 McGinnis Ferry Road, Suwanee, GA,30024 1-888-935-8880*HDR viewing experience will vary by model, content availability and internet connection.U7 Series Quantum Hisense Google TVModel 65U7Hinches65DIMENSIONS/WEIGHTTV Dimensions (without the stand)57.0×33.1×3.5inches (with the stand)57.0×35.5×10.7nches TV Stand Width48.0×10.7inches 36.5×10.7inches TV Weight (without the stand)43.0lbs (with the stand)44.1lbsCarton Dimensions (WxHxD)63.1×38.9×7.0 inches Shipping Weight 65.5 lbsDISPLAYActual Screen Size (Diagonal)65‘’Screen Class 65‘’Screen Type LED backlight LCD TV TYPE OF TV Smart TV Yes, Google TVApp Store Yes (Google Play store)PICTURE QUALITY Response Time (ms) 6.5ms Screen Resolution 3840*2160Local Dimming Yes 90 zones Peak Brightness 1000nits Wide Color Gamut Yes Motion Rate 480Aspect Ratio 16:9HDR*Yes (DolbyVision/HDR10/HDR10+/HLG)Color Depth1.07G/(8bit + FRC)Backlight Type Source FULL ARRAY AUDIOAudio Output Power (Watts)10W x 2Dolby Atmos Yes IMAX Enhanced Yes LANGUAGES On-screen Display Eng/Fre/Spa POWERPower Consumption 300W Standby Consumption <0.5WPower Supply (Voltage/Hz)AC 120V/220V,50/60Hz CONNECTIVITY Wi-Fi Built In 802.11 acDual band (2.4/5 GHz)Bluetooth®Yes (v5.0)PORTS HDMI4 (2 x up to 4K@120Hz, 2 x up to 4K@60Hz)HDMI eARC & CEC Yes Ethernet (LAN)YesOTHER FEATURES Noise Reduction Digital Noise Reduction Parental Control Yes ALLMYes Closed Caption YesVRRYes (48-120Hz)FreeSync Premium Yes Dolby Vision Gaming Yes Room Audio Correction Yes Sleep Timer Yes Google Assistant Yes Alexa Yes Chromecast YesWeb BrowserYes (Google Play store)Hands Free Voice Control Yes Remote Finder Yes MEMC Yes 4K Upscale YesWALL MOUNT VESA VESA Standard (300*200) M6ACCESSORIES Remote 1 (Voice Remote)Quick Start Guide and/or User Manual English/Spanish/French Power Cable 1WARRANTY/UPC Warranty 2 yearsUPC Code888143013213USB 2 (USB3.0+USB 2.0)RF Antenna1RCA Composite Video Input1 (3.5mm with adapter)L/R Audio Input for Composite 1 (3.5mm with adapter)Digital Audio Output 1 Optical Earphone/Audio Output1。
纹理物体缺陷的视觉检测算法研究--优秀毕业论文
摘 要
在竞争激烈的工业自动化生产过程中,机器视觉对产品质量的把关起着举足 轻重的作用,机器视觉在缺陷检测技术方面的应用也逐渐普遍起来。与常规的检 测技术相比,自动化的视觉检测系统更加经济、快捷、高效与 安全。纹理物体在 工业生产中广泛存在,像用于半导体装配和封装底板和发光二极管,现代 化电子 系统中的印制电路板,以及纺织行业中的布匹和织物等都可认为是含有纹理特征 的物体。本论文主要致力于纹理物体的缺陷检测技术研究,为纹理物体的自动化 检测提供高效而可靠的检测算法。 纹理是描述图像内容的重要特征,纹理分析也已经被成功的应用与纹理分割 和纹理分类当中。本研究提出了一种基于纹理分析技术和参考比较方式的缺陷检 测算法。这种算法能容忍物体变形引起的图像配准误差,对纹理的影响也具有鲁 棒性。本算法旨在为检测出的缺陷区域提供丰富而重要的物理意义,如缺陷区域 的大小、形状、亮度对比度及空间分布等。同时,在参考图像可行的情况下,本 算法可用于同质纹理物体和非同质纹理物体的检测,对非纹理物体 的检测也可取 得不错的效果。 在整个检测过程中,我们采用了可调控金字塔的纹理分析和重构技术。与传 统的小波纹理分析技术不同,我们在小波域中加入处理物体变形和纹理影响的容 忍度控制算法,来实现容忍物体变形和对纹理影响鲁棒的目的。最后可调控金字 塔的重构保证了缺陷区域物理意义恢复的准确性。实验阶段,我们检测了一系列 具有实际应用价值的图像。实验结果表明 本文提出的纹理物体缺陷检测算法具有 高效性和易于实现性。 关键字: 缺陷检测;纹理;物体变形;可调控金字塔;重构
Keywords: defect detection, texture, object distortion, steerable pyramid, reconstruction
II
量子点在生物医学领域的应用
量子点在生物医学领域的应用基金项目:吉林省科学技术厅资助项目(NO.20082123)*通讯作者文章编号:1007-4287(2009)06-0847-03量子点在生物医学领域的应用王雅丽,张玉成,张桂珍*(吉林大学中日联谊医院中心实验室,吉林长春130033)生命科学的高速发展离不开新技术新方法的应用。
近些年来,量子点在生物医学领域的应用已经成为人们广泛关注的研究热点之一,量子点在体内外成像,靶向标记特异组织和细胞等方面均取得了新的进展。
相对于传统的荧光染料分子而言,量子点具有其独特的特性及优点。
本文对近年来量子点在生物医学领域的诸多应用及进展做一综述。
1 量子点基本组成结构及光学特性1.1 量子点概念量子点(Quantum Dots,QDs),也称半导体纳米晶(Nanocrystals,NCs),它是由族元素或! ?族元素组成的小于100nm 的半导体纳米微晶体,当这些半导体纳米微晶体的直径小于激子的波尔直径(<10nm)时,这些半导体纳米微晶体由于受到量子尺寸效应和介电限域效应的影响,从而表现出独特的光学特征[1-3]。
1.2 量子点的光学特性及优点 QDs 与传统的有机荧光染料相比,其光学特性有:1.2.1 QDs 的激发光波长(e xcitation wave lengths)范围宽且连续分布,其荧光可以被波长小于其量子限域峰的任意光源所激发,而其发射波长(emission wa ve lengths)的范围窄且呈对称分布[4,5] ,可检测到的光谱范围内同时使用多个探针,而发射光谱不出现交叠。
1.2.2 QDs 的发光特征具有严格的量子尺寸效应,通过改变量子点粒径大小可获得从紫外到近红外范围内任意点的光谱[6],这样仅用一种波长的激发光源便可激发多种荧光,进行多元荧光检测。
1.2.3 QDs 的抗光漂白能力强,光漂白作用是指由光激发引起发光物分解而导致的荧光强度降低的现象[7]。
量子点材料应用于发光二极管的研究进展
量子点材料应用于发光二极管的研究进展郝艺;徐征;李赫然;李青【摘要】量子点材料因具有独特的光学特性而被广泛应用于发光领域,用其作发光层可制成量子点发光二极管.与有机电致发光二极管相比,量子点发光二极管具有发光光谱窄、色域广、稳定性好、寿命长、制作成本低等优势.本文介绍了量子点发光器件在国内外的热点研究方向及取得的成果,并对其发展前景进行展望.%Quantum dots are extensively used in luminescence devices due to its unique optical properties.As a light-emitting layer,quantum dots can be made into a quantum dot light-emitting pared with the organic light-emitting diode,quantum dot light-emitting diode possesses several unique advantages such as narrow emission spectrum,wide color gamut,good stability,long service life,and low cost.The hot research directions and the achievements of quantum dot light-emitting diode are introduced,and the prospects of quantum dot light-emitting diode in display field are discussed.【期刊名称】《材料科学与工程学报》【年(卷),期】2018(036)001【总页数】7页(P151-157)【关键词】量子点;发光二极管;电致发光【作者】郝艺;徐征;李赫然;李青【作者单位】东旭集团有限公司,河北石家庄 050021;北京交通大学理学院,北京100044;东旭集团有限公司,河北石家庄 050021;东旭集团有限公司,河北石家庄050021【正文语种】中文【中图分类】TN383+.11 前言量子点(Quantum Dots,简称QDs),又称纳米晶,由有限数目的原子组成,三维尺寸都处在纳米量级的新型无机半导体材料。
量子点和量子点激光器
量子点的制造方法:量子点的制备可采用分子束外延技术在各种 自然表面上直接生长的方法。如在小偏角表面(vicinal surface) 超台阶面( super steps) 、高指数表面等或者在一些由人工做出 的图形衬底上生长。如V 形槽、在掩膜表面上选择局部生长、自 组织生长法等。下面介绍几种具体的制备方法
(1) 对于三维体系,在固体物理中,已求得其态 密度与能量的关系是抛物线形,如图(a) 所示。
(2)当体系为在某个方向(如z向)受限的二维体系(量子阱) 时,受限方向(z向)的平移对称性被破坏,kz不再是好量 子数,该方向发生能级分裂。一个本征态的能量可以写 为E=Ei + Exy(kx,ky),其中Ei是z方向的量子化的能级 值。 在量子阱中,电子能量
若要严格定义量子点,则必须由量子力学(quantum mechanics)出发。 我们知道电子具有粒子性与波动性,电 子的物质波特性取决于其费米波长(Fermi wavelength)
λF = 2π / kF
• 在一般块材中,电子的波长远小于块材尺寸,因此量子局限 效应不显着。
• 如果将某一个维度的尺寸缩到小于一个波长,此时电子只能 在另外两个维度所构成的二维空间中自由运动,这样的系统 我们称为量子阱(quantum well);
对于零维的量子点而言,体系在x、y、z三个方向受限, 载流子的能量在三个方向上都是量子化的,不存在能量的 连续分布。所以,量子点的态密度与能量的关系表示为δ 函数的形式,即
ρ3D(E) = ∑ δ ( E - Ei)
i
其中Ei是体系的能量可取值,可表示为
量子点的能态图形为类氢光谱状的分离线, 如图(d)所示。
• 量子点是目前理论上与实验上的热门研究题 目,世界各国无不积极投入研究,主要领先 的有美国、日本、欧盟及俄罗斯等,台湾也 正在急起直追中。
石墨烯量子点简介
石墨烯量子点简介1、石墨烯量子点定义量子点(QuantumDot)是由有限数目的原子构成,属于准零维材料,即在三个维度上尺寸均呈现纳米级别。
外观恰似球形物或者类球形,其内部电子在各个方向的运动均会受到限制,因此量子限域效应非常明显。
石墨烯量子点(Graphene Quantum Dots)一般是横向尺寸在100nm以下,纵向尺寸可以在几个纳米以下,具有一层、两层或者几层的石墨烯结构,也就是特殊的非常小的石墨烯碎片。
它的特性来源于石墨烯以及碳点,表现出生物低毒性、优异的水溶性、化学惰性、稳定的光致发光、良好的表面修饰。
2、石墨烯量子点制备石墨烯量子点的合成可以看做是对碳纳米晶体合成方法的延伸和补充,仍旧分为:自上而下和自下而上的制备。
自上而下的方法是指通过物理或化学方法将大尺寸的石墨烯薄片切割成小尺寸的GQDs,包括水热法、电化学法和化学剥离碳纤维法等;自下而上的制备法则是指以小分子作前驱体通过一系列化学反应制备GQDs,主要是溶液化学法、超声波和微波法等。
3、石墨烯量子点发光机理荧光是种光致冷发光的现象,当某种常温物质经某种波长的入射光(通常是紫外线或x-ray)照射,吸收光能后进入激发态,且立即退激发并发出出射光,而荧光可在吸光激发后约10^-8秒内发光,其能量小于吸光的能量。
通常,若是把材料制成量子点大小,则电子容易受到激发而改变能阶,与电洞(空穴)结合后就会放出光。
石墨烯量子点由于边缘效应和量子尺寸效应,可表现出独特的光化学特质。
石墨烯除了具有碳量子点所具有的优点外,其荧光具有激发波长依赖性。
当激发波长从310nm 变成380nm时,荧光发射峰位置的相应从450nm移至510nm,光致发光强度迅速降低。
氧化石墨烯表现出宽谱的红光发射,取决于其含有的含氧官能团,而氧化石墨烯被还原之后由于含氧官能团减少以及结构的改变,主要呈现蓝光(第一性原理模拟推测其由碳空位缺陷引发)。
修饰类石墨烯具有相似的规律,发光光谱主要由两部分组成:蓝光发光峰位(不移动)、长波长发光(峰位移动),相对于没有经过修饰的石墨烯,其长波长发光显著增强。
一步水热法合成碳量子点实现癌细胞的荧光成像研究
第36卷第2期2021年6月Vol.36No.2Jun.2021青岛大学学报(工程技术版)JOURNAL OF QINGDAO UNIVERSITY(E&T)文章编号:10069798(2021)02008706;DOI:10.13306/.10069798.2021.02.014一步水热法合成碳量子点实现癌细胞的荧光成像研究刘敬杨紫怡2,闫伟华2,刘鸿飞」,杨学成1(1.青岛大学医学院,山东青岛266071; 2.青岛大学附属医院,山东青岛266555)摘要:针对传统荧光染料存在合成成本高、工艺复杂、毒副作用强等问题,本文基于一步水热法,以间苯二酚和磷酸为原料,经真空干燥箱中加热,合成了具有成本低廉、生物相容性良好的纳米级荧光染料碳量子点(carbon quantum dots,CQDs)。
同时,对CQD的形貌、粒径及光学特性进行表征,并对CQD 的元素、官能团及其在不同pH环境下的荧光强度进行分析,将CQDs应用于癌细胞的荧光成像。
研究结果表明,制备得到的CQDs具有尺寸均一,分散性良好等特点;该量子点的荧光强度可随pH值的 变化而改变,且在一定的pH值区间内,CQDs的荧光强度与pH值存在线性关系,证明该量子点可应用于对癌细胞的检测及荧光成像。
该研究对临床医学中的癌细胞识别及成像领域具有重要意义。
关键词:碳量子点;癌细胞;荧光成像中图分类号:R31&51;R31&08文献标识码:A近年来,荧光成像技术发展日新月异,其在辅助治疗癌细胞领域起到关键作用[1]。
传统的荧光染料大多含有苯环化合物,由于这些荧光染料合成成本高、工艺复杂、毒副作用强等因素,限制了其进一步应用,因此开发新型的荧光染料势在必行。
作为一种新型的碳纳米材料,碳量子点因其水溶性好、光稳定强等性能,受到人们的关注13]。
碳量子点(carbon quantum dots,CQDs)是一类由分散的类球状碳颗粒组成的尺寸极小的纳米颗粒,粒径一般小于10nm。
量子点激子动力学
量子点激子动力学量子点激子动力学是一个涉及量子点中激子行为的物理学领域。
为了更好地理解这个概念,我们首先需要了解什么是量子点和激子。
量子点(Quantum Dot)是一种纳米级的半导体材料,通常只有几个到几十个纳米的大小。
由于其尺寸与电子的德布罗意波长相当或更小,量子点具有显著的量子限制效应,这使得它们具有独特的光学和电学性质。
激子(Exciton)是一个由库仑力相互束缚的电子-空穴对。
在量子点中,激子是一个非常重要的概念,因为当量子点受到光激发时,会形成一个激子态,这个激子态会影响量子点的光学性质。
量子点激子动力学主要研究的是量子点中激子的形成、演化、和衰减等动力学过程。
这些过程对于理解量子点的光学性质以及设计基于量子点的光电器件都非常重要。
具体来说,量子点激子动力学的研究内容包括:1.激子的形成:当量子点受到光激发时,电子会从价带跃迁到导带,留下一个空穴。
这个电子和空穴通过库仑力相互束缚,形成一个激子。
2.激子的演化:激子在量子点中会受到各种相互作用的影响,如库仑相互作用、电子-声子相互作用等。
这些相互作用会导致激子的能级分裂、能量转移等现象。
3.激子的衰减:激子可以通过辐射跃迁(发出光子)或非辐射跃迁(如热弛豫)等方式衰减。
这些衰减过程对于量子点的发光效率和稳定性都有重要影响。
为了研究这些动力学过程,科学家们通常会使用各种实验手段,如时间分辨光谱、瞬态吸收光谱等。
这些实验手段可以帮助我们了解激子的寿命、能级结构、以及与其他粒子(如声子、其他激子等)的相互作用等信息。
总的来说,量子点激子动力学是一个涉及多个领域的交叉学科,它不仅对于理解量子点的基本性质具有重要意义,也为设计基于量子点的光电器件提供了理论基础和指导。
Solution-processed, high-performance light-emitting diodes based on quantum dots
Institute of Advanced Materials (IAM), National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.
Quantum dots are solution-processable semiconductor nanocrystals9–11 that promise size-tunable emission wavelengths, narrow emission linewidths, near-unity-photoluminance quantum yield and inherent photophysical stability. As inorganic crystalline emission centres, quantum dots are expected to be promising candidates to overcome stability problems of both polymer LEDs and small-molecule organic LEDS (OLEDs), such as drastic efficiency roll-off at high current densities and low operational lifetime. To fully exploit the superior properties of quantum dots, a number of quantum-dot-based LED (QLED) structures were developed and various materials, including small molecules, conjugated polymers and inorganic oxides, were explored as charge-transport interlayers3,12–20.
纳米制造 材料规范 发光纳米材料 第1部分:空白技术规范-最新国标
纳米制造材料规范发光纳米材料第1部分:空白技术规范1范围本文件规定了单分散发光纳米材料的基本光学性质与一些其他性质。
本文件未明确规定发光纳米材料的特性指标,供需双方可根据具体应用需求协商确定。
本文件不适用于发光纳米材料混合物或聚集体。
2规范性引用文件下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。
其中,注日期的引用文件,仅该日期对应的版本适用于本文件。
不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。
GB/T37664.1纳米制造关键控制特性发光纳米材料第1部分:量子效率(GB/T 37664.1-2019,IEC62607-3-1:2014,IDT)IEC/TS62607-3-2纳米制造关键控制特性第3-2部分发光纳米材料分散液中量子点质量的测定(Nanomanufacturing-Key control characteristics-Part3-2: Luminescent nanoparticles-Determination of mass of quantum dot dispersion)3术语和定义下列术语和定义适用于本文件.3.1吸收系数absorption coefficient吸光度与通过样品的光路长度的比值。
注:吸收系数在已知浓度且光散射影响可忽略不计的波长处测定。
3.2颜色colour通过色空间中三个坐标作为唯一标识的发光纳米材料的光学特征注1:如1931CIE中的三色值和CIELAB1976L*a*b*色空间。
注2:对于颜色测定,应指定光源(如光源A、光源D65)和观测角度(如2°或10°)。
3.3生产日期date of manufacture发光纳米材料的最初合成日期。
3.4发射光谱emission spectrum发光纳米材料在特定激发下所发出辐射的谱图分布。
[来源:CIE S017/E:2011,ILV:国际发光词汇,定义17-380]3.5发射波长峰值emission wavelength peak[发射光谱上]最强发射处对应的波长。
量子点液晶显示背光技术
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中国光学
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(~450nm)和较宽 光 谱 的 黄 光 (~550nm)两 种 组分构成,而应用了量子点的背光技术中,光谱由 窄发射的 红 绿 蓝 (RGB)三 组 分 构 成。 从 背 光 源 中发出的白光经过彩色滤光片后会被过滤成 RGB三基色的光,通过液晶控制 RGB三基色的 强度,从而实现不同彩色图像的显示。由此可以 看出,在传统的白光 LED背光中,彩色滤光片是 决定液晶显示器色域的最主要因素,比如常用的 72型彩色滤光片,得到的液晶显示器的最终色域 为 ~72%NTSC[9],量子点背光技术的应用可以将 液晶显示器的色域提升至 110% NTSC。此外,由 于白光 LED背光中大部分的黄光会被过滤掉,导 致背光的利用率降低,相关的分析表明,彩色滤光 片对背光的利用率仅为 30%。除了提升色域之 外,量 子 点 背 光 技 术 的 优 势 还 表 现 为,RGB分 离 的背光光谱与彩色滤光片的透过率光谱区间基本 吻合,从而可以提升背光源的利用率,在相同的工 作电压下,量子点背光技术能够将屏幕亮度提升 到原有的 120%。
(1)概述了量子点背光技术中具有重要应用 前景的几类量子点材料及其发展现状。
(2)详细 介 绍 了 量 子 点 背 光 技 术 的 应 用 结 构,以及对应于不同应用结构中的量子点材料的 复合与封装工艺发展现状,主要分为量子点与无 机材料复合形成的复合材料以及量子点与聚合推出的高端电视中,当 时叫做 “特丽魅 彩 TRILUMINOS”技 术[4]。从 科 学研究的角度看,量子点显示技术更是由来已久, 2010年,来自三星公司的研究团队首次将量子点 应用 到 了 一 台 46英 寸 的 液 晶 显 示 器 研 究 样 机 中[5],显 示 图 像 的 色 彩 大 幅 提 升,色 域 达 到 了 1043%NTSC,验证了量子点在提升 LCD色域中 的巨大潜力。本文主要从以下两个方面对量子点 背光技术的进展进行了概述,并结合作者对量子 点材料和显示技术的认识提出了量子点背光技术 发展中存在的问题和挑战以及未来可能的发展方 向。
Quantum_Dot
定义量子点(quantum dot)是准零维(quasi-zero-dimensional)的纳米材料,由少量的原子所构成。
粗略地说,量子点三个维度的尺寸都在100纳米(nm)以下,外观恰似一极小的点状物,其内部电子在各方向上的运动都受到局限,所以量子局限效应(quantum confinement effect)特别显著。
研究历史现代量子点技术要追溯到上世纪70年代中期,它是为了解决全球能源危机而发展起来的。
通过光电化学研究,开发出半导体与液体之间的结合面,以利用纳米晶体颗粒优良的体表面积比来产生能量。
初期研究始于上世体80年代早期2个实验室的科学家:贝尔实验室的Louis E.Brus博士和前苏联Yoffe研究所的AlexanderEfros和A.I.Ekimov博士。
Brus博士与同事发现不同大小的硫化镉颗粒可产生不同的颜色。
这个工作对了解量子限域效应很有帮助,该效应解释了量子点大小和颜色之间的相互关系,也同时也为量子点的应用铺平了道路。
1997年以来,随着量子点制备技术的不断提高,量子点己越来越可能应用于生物学研究。
1995年,AlivisatosI.Z.]和Nie两个研究小组首次将量子点作为生物荧光标记,并且应用于活细胞体系,他们解决了如何将量子点溶于水溶液,以及量子点如何通过表面的活性基团与生物大分子偶联的问题,由此掀起了量子点的研究热潮。
主要性质(1)量子点的荧光寿命长。
有机荧光染料的荧光寿命一般仅为几纳秒(这与很多生物样本的自发荧光衰减的时间相当)。
而量子点的荧光寿命可持续数十纳秒(20ns一50ns),这使得当光激发后,大多数的自发荧光已经衰变子点荧光仍然存在,此时即可得到无背景干扰的荧光信号。
(2)生物相容性好。
量子点经过各种化学修饰之后,可以进行特异性连接,其细胞毒性低,对生物体危害小,可进行生物活体标记和检测。
(3)量子点具有很好的光稳定性。
量子点的荧光强度比最常用的有机荧光材料“罗丹明6G”高20倍,它的稳定性更是“罗丹明6G”的100倍以上。
索尼Q70T电视说明书
PRODUCT HIGHLIGHTS•Quantum Processor 4K •Motion Rate 240•Ambient Mode+™1•Quantum HDR •Dual LEDSIZE CLASS KEY FEATURESEquipped with Quantum Dot Technology, this TV unleashes a massive spectrum of a billion shades of color. A crisp 240Hz motion rate banishes blur and smooths out the picture for more fl uid action. It even looks great when you’re not watching at all, thanks to Ambient Mode+.Picture• Quantum HDR • Quantum Processor 4K• 100% Color Volume with Quantum Dot 2• Dual LED • 4K UHD• Real Game Enhancer+™• Motion Rate 240• Wide Viewing Angle •Adaptive Picture™Design• Boundless Design•Black Slim Feet with Metallic CoatingSmart Features• Smart TV Powered by Tizen •Universal Guide• Ambient Mode+™1• Multiple Voice Assistants³• TV Plus • Mobile View• Samsung OneRemote •SmartThings CompatibleConnections• 4 HDMI Connections 4• HDMI 2.1 Port 4•eArc Port 3• 2 USB Connections • LAN Port•802.11AC built-in Wi-Fi • Bluetooth ®• RS232 Control (Ex-Link)• IP Control Support 5•Optical Audio Output PortAudio•Active Voice Amplifi er • Dolby ® Digital Plus •20 Watt 2 ChannelIncluded Accessories•Samsung OneRemoteIndustry Certifications•4K Ultra HD Connected• HDR10+¹Background feature accuracy may vary based on TV location and is dependent on wall designs, patterns and/or colors. SmartThings appon a mobile device (Android, iOS) is required for some functionality. App features may be limited at launch; please continue to check for updates. ²QLED televisions can produce 100% Color Volume in the DCI-P3 color space, the format for most cinema screens and HDR movies for television. ³The Google Assistant service may not yet be available at the time of purchase of this product, please continue to check for app updates. ⁴HDMI—CEC (Consumer Electronics Control) facilitates convenient control functions with compatible devices. ⁵Requires third-party control system installation. See /us/business/custominstall.85"85Q70T82"82Q70T75"75Q70T65"65Q70T55"55Q70TPICTUREQuantum HDRExpands the range of color and detail beyond what’s possible on HDTVs.Quantum Processor 4KThis powerful processor uses deep-learning AI to transform everything you watch into stunning 4K.100% Color Volume with Quantum DotQuantum Dots produce over a billion shades of color that stay true to life, even in bright scenes.Dual LEDA system of dedicated warm and cool LED backlights enhances contrast details.4K UHDSee what you’ve been missing on a crisp, clear picture that’s 4X the resolution of Full HD.Real Game Enhancer+™Engineered to make the TV and gaming console work seamlessly together to reduce lag, tearing and stuttering. Motion Rate 240Minimizes motion blur on screen so action-packed movies and sports stay smooth and crisp.Wide Viewing AngleGet a great picture from every seat.Adaptive Picture™Your TV reacts and adjusts to the lighting conditions around it. HDR Formats SupportedHDR10 (Static MetaData), HDR10+ (Dynamic MetaData), HLG (Hybrid Log Gamma). All Samsung 4K UHD TVs also meet the CTA HDR-Compatible Definition.DESIGNBoundless DesignAn ultra-thin bezel on all sides for a stunningly clean look. SMART FEATURESSmart TV Powered by TizenGo beyond smart TV with next-gen apps, super-easy control and a host of enhancements that elevate the TV-watching experience. Universal GuideOne simple on-screen guide organizes your streaming and live TV content, while also making recommendations.Ambient Mode+™Elevates your space by turning a blank screen into décor, artwork, pictures or other visuals.Multiple Voice AssistantsBuilt-in Alexa, Google Assistant and Bixby voice assistants let you control your TV with your voice, get information and do so much more.TV PlusEnjoy your favorite content through virtual channels.Mobile ViewEasily send smartphone content to your TV to simultaneously display live and casted content, share photos or visualize music. Samsung OneRemoteThe sleek and slim OneRemote automatically detects and controls all compatible connected devices and content. SmartThings CompatibleExperience more than TV, with a dashboard for seamlessly controlling your smart home devices and appliances.CONNECTIONSHDMIEnjoy higher-quality audio and video with an HDMI connection that transmits both signals over a single cable. Compatible with next-generation Ultra HD Blu-ray™ players and HDR content decoding. Includes 1 Audio Return Channel (ARC).Wi-FiEnjoy your favorite on-demand content seamlessly through your existing network with built-in Wi-Fi (802.11AC).AUDIOActive Voice AmplifierDetects noise disturbances and then amplifies the dialogueas needed.Dolby® Digital PlusEnjoy the ultimate digital sound quality on all your favorite movies, TV shows and streaming content. Dolby Digital Plus optimizes your entertainment experience with enhanced sound richness and clarity.INCLUDED ACCESSORIESSamsung OneRemote TM-2050C (Black)INDUSTRY CERTIFICATIONS4K Ultra HD ConnectedAll Samsung 2019 4K UHD and QLED televisions complywith the CTA 4K Ultra High-Definition Connected definition requirements. The trade organization known as the Consumer Technology Association (CTA™) is considered an industry authority on engineering standards for consumer electronics in the United States. Visit www.cta.tech for more information. HDR10+HDR10+ advances the current industry standard of High Dynamic Range (HDR) and HDR10 TV formats. As an upgraded version of HDR10, HDR10+ adds dynamic metadata to each frame. This optimal HDR data enables advanced chipsets from leading manufacturers to create a true-to-life picture across a wider range of displays.MODELSSCREEN SIZE CLASS: 85"SCREEN DIAGONAL MEASUREMENT: 84.5" UPC CODE: 887276390970 COUNTRY OF ORIGIN: MexicoDIMENSIONS (INCHES W x H x D):•TV WITHOUT STAND: 74.7 x 42.6 x 2.4•TV WITH STAND: 74.7 x 46.7 x 15.1• SHIPPING: 82.3 x 49.1 x 10.2•STAND FOOTPRINT: 3.1 x 10.9 x 15.4 WEIGHT (LB):•TV WITHOUT STAND: 104.7•TV WITH STAND: 107.4• SHIPPING: 140.7VESA SUPPORT:Yes (600 x 400)ACCESSORIES INCLUDED IN BOX:•REMOTE MODEL: TM-2050C (Black)SCREEN SIZE CLASS: 82"SCREEN DIAGONAL MEASUREMENT: 81.5" UPC CODE: 887276390895 COUNTRY OF ORIGIN: MexicoDIMENSIONS (INCHES W x H x D):•TV WITHOUT STAND: 72.1 x 41.1 x 2.5•TV WITH STAND: 72.1 x 45.3 x 15.4• SHIPPING: 80 x 47.6 x 10.2•STAND FOOTPRINT: 3.1 x 10.9 x 15.4 WEIGHT (LB):•TV WITHOUT STAND: 96.3•TV WITH STAND: 99• SHIPPING: 129.6VESA SUPPORT:Yes (600 x 400)ACCESSORIES INCLUDED IN BOX:•REMOTE MODEL: TM-2050C (Black)MODELSSCREEN SIZE CLASS: 65"SCREEN DIAGONAL MEASUREMENT: 64.5"UPC CODE: 887276390963COUNTRY OF ORIGIN: MexicoDIMENSIONS (INCHES W x H x D): • TV WITHOUT STAND: 57.1 x 32.6 x 2.3• TV WITH STAND: 57.1 x 35.7 x 11.4• SHIPPING: 63.2 x 37.9 x 7• STAND FOOTPRINT: 1.8 x 7.8 x 12.7WEIGHT (LB): • TV WITHOUT STAND: 49.2• TV WITH STAND: 49.8• SHIPPING: 66.8VESA SUPPORT: Yes (400 x 300) ACCESSORIES INCLUDED IN BOX:• REMOTE MODEL: TM-2050C (Black)SCREEN SIZE CLASS: 75"SCREEN DIAGONAL MEASUREMENT: 74.5"UPC CODE: 887276390857COUNTRY OF ORIGIN: Mexico DIMENSIONS (INCHES W x H x D): • TV WITHOUT STAND: 66 x 37.8 x 2.4• TV WITH STAND: 66 x 41.3 x 13.9• SHIPPING: 72.4 x 44 x 7.8• STAND FOOTPRINT: 1.9 x 8.4 x 13.6WEIGHT (LB): • TV WITHOUT STAND: 79.4• TV WITH STAND: 80• SHIPPING: 103.8VESA SUPPORT: Yes (400 x 400) ACCESSORIES INCLUDED IN BOX:• REMOTE MODEL:TM-2050C (Black)SCREEN SIZE CLASS: 55"SCREEN DIAGONAL MEASUREMENT: 54.6"UPC CODE: 887276390789 COUNTRY OF ORIGIN: MexicoDIMENSIONS (INCHES W x H x D):•TV WITHOUT STAND: 48.4 x 27.8 x 2.3•TV WITH STAND: 48.4 x 30.9 x 9.6• SHIPPING: 55 x 33.3 x 6.2•STAND FOOTPRINT: 1.8 x 7.8 x 10.4WEIGHT (LB):•TV WITHOUT STAND: 35.7•TV WITH STAND: 36.2• SHIPPING: 50VESA SUPPORT:Yes (200 x 200) ACCESSORIES INCLUDED IN BOX:•REMOTE MODEL: TM-2050C (Black)。
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Abstract: Colloidal quantum dots which can emit red, green, and blue colors are incorporated with a micro-LED array to demonstrate a feasible choice for future display technology. The pitch of the micro-LED array is 40μm, which is sufficient for high-resolution screen applications. The method that was used to spray the quantum dots in such tight space is called Aerosol Jet technology which uses atomizer and gas flow control to obtain uniform and controlled narrow spots. The ultra-violet LEDs are used in the array to excite the red, green and blue quantum dots on the top surface. To increase the utilization of the UV photons, a layer of distributed Bragg reflector was laid down on the device to reflect most of the leaked UV photons back to the quantum dot layers. With this mechanism, the enhanced luminous flux is 194% (blue), 173% (green) and 183% (red) more than that of the samples without the reflector. The luminous efficacy of radiation (LER) was measured under various currents and a value of 165 lm/Watt was recorded.
#244116 © 2015 OSA
Received 2 Jul 2015; revised 20 Oct 2015; accepted 3 Nov 2015; published 9 Dec 2015 14 Dec 2015 | Vol. 23, No. 25 | DOI:10.1364/OE.23.032504 | OPTICS EXPRESS 32504
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Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan 2 Institute of Photonic System, National Chiao Tung University, Tainan 711, Taiwan 3 Department of Electric and Computer Engineering, Hong Kong University of Science and Technology, Kowloon 999077, Hong Kong, China 4 Phosphors Research Laboratory, Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan 5 chienchunglin@.tw 6 hcku3. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33.
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