光注入与电注入下LED发光特性研究

重庆大学本科学生毕业设计（论文）

光注入与电注入下LED发光特性研究

学生：吴飞

学号：20073401

指导教师：文静

专业：光电信息工程

重庆大学光电工程学院

二O一一年六月

Graduation Design(Thesis) of Chongqing University

The studies on characteristics of luminescence under optical and electronic

injection

Undergraduate: Wufei

Supervisor: Prof. Wenjing

Major: Optoelectronic Information Engineering

College of Opto-Electronic Engineering of

Chongqing University

June 2011

摘要

发光二极管（LED）的非接触测量手段就是光激励LED，那么非接触测量手段能否实现关键是光激励能否取代电激励。国内外的研究表明，在分别往AlInGaP 红色LED里注入相同强度的电流和光强激励LED时，PL和EL有着极为相似的光谱，但是光谱随着注入强度的变化，存在着波峰红移情况，造成两种光谱图有差异。

随着研究的深入，发现影响这种差异的不是注入方式的影响，而是注入方式的不同给LED的p-n结温带来的不同影响，也就是说如果能控制p-n结的结温，相同注入强度下的PL和EL光谱会完全相同，研究表明光注入完全可以取代电注入，即：非接触测量手段是完全可能实现的。

本课题通过研究了LED的发光机理，以及影响LED发光的因素，通过比较光注入与电注入下LED发光特性的区别，得出了以下结论：光致发光和电致发光有着完全相同的发光原理，影响发光光谱的因素也完全相同，但是PL光谱和EL光谱存在着差异，这种差异不是注入方式的影响，而是源于注入方式的不同给LED 结温带来的不同影响。

关键词：发光二极管（LED），p-n结结温，光致发光（PL），电致发光（EL），注入方式

ABSTRACT

The measurement of Light-emitting diodes' (LEDs) non-contact is LED optical excitation,Then the key to the realization of Non-contact measurements is whether electrical stimulation can be replaced by electrical stimulation. Domestic and international researches show that:Respectively, injected at the same intensity current and light to AIInGaP red light-emitting diodes to excite the LED, PL and EL has a very similar spectrum. However, with the different injection of intensities, peak Red shift condition exists, resulting in a difference in the two spectra.

With further research,We find that this difference is not the impaction of different ways of injection methods, but the different injection methods which bring different impacts on p-n junction temperature to the LED .That is to say if we can control the temperature of p-n junction ,We'll get exactly the same spectrum under the same PL and EL intensities.The results show that optical injection can replace the power injection ,Namely: non-contact measurement means is possible to achieve.

This topic research the luminescence mechanism of the LED and the factors that affect LED Light-emitting By comparing the differences of LED light-emitting properties under the optical and electrical injection,we draw the following conclusions ：Photoluminescence and electro-luminescence have the exactly same light-emitting principle ,the factors that affect the Luminescence spectrum of are the same but PL spectra and EL spectra are different,the difference is not the impaction of different ways of injection methods, but the different injection methods which bring different impacts on p-n junction temperatures to the LED.

Key words: Light-emitting diode(LED), p-n junction temperatures, Photoluminescence (PL), Electroluminescence(EL)