电流与温度对蓝光LED和白光LED发光性能的影响  

Current and Temperature Effects on Luminescence Properties of Blue and White LEDs

作　　者：唐燕如 赵帝 易学专[1] 陈杰[1] 田燕娜 周圣明[1] Tang Yanru;Zhao Di;Yi Xuezhuan;Chen Jie;Tian Yanna;Zhou Shengming(Laboratory of Miaro/Nano Optoelectronic Functional Materials,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;College of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]中国科学院上海光学精密机械研究所微纳光电子功能材料实验室,上海201800 [2]上海科技大学物质科学与技术学院,上海201210

出　　处：《中国激光》2021年第21期72-78,共7页Chinese Journal of Lasers

基　　金：中国科学院国际合作项目(181231KYSB20160005);上海市科委创新项目(19511104600)。

摘　　要：研究了在恒温变电流与恒电流变温下蓝光单色芯片的电致发光光谱特征,以及在这两种模式下蓝光芯片与荧光陶瓷封装形成的白光LED的发光性能。结果表明:在温度一定的条件下,随着激发电流增大,LED芯片的发光光谱蓝移;在电流一定的条件下,随着蓝光LED芯片温度升高,LED芯片的发光光谱红移;蓝光芯片发射光谱的改变会影响荧光陶瓷的吸收转换效率,进而改变白光LED的发光性能。Objective The third generation of lighting source,light emitting diode(LED),has the advantages of energy savings and environmental protection,no startup delay,low energy consumption,and long life.As a result,it is widely used in traffic signal display,street lighting,car lighting,home lighting,high-power stadium lighting,liquid crystal display backlight,full-color display,and other fields.Currently,the white LED which is composed of blue LED chips and cerium-doped yttrium aluminum garnet(Ce∶Y_(3)Al_(5)O_(12),abbreviated as Ce∶YAG)yellow phosphor conversion materials is mainly used for white light illumination and display.Part of the blue light emitted by the blue LED is absorbed by the cerium ion in the yttrium aluminum garnet and converted into yellow light,which is mixed with the remaining blue light to form white light.As the power of the blue LED chips increases,the requirements for the luminescence performance and thermal stability of yellow phosphor conversion materials also increase.Yellow phosphor conversion materials are mainly phosphor powder,phosphor glass,phosphor crystal,and phosphor ceramics.Researchers at home and abroad have conducted several in-depth studies on the luminescence properties of phosphor conversion materials.However,there are only a few reports on the effect of excitation conditions and environment on the luminescence performance of blue LED chips and then on the luminescence of white LED chips.Methods The changing trend of blue LED chip electroluminescence(EL)spectra is studied based on two excitation modes—constant temperature and constant current.Ce∶YAG phosphor ceramic has been made and processed to a suitable size and encapsulated on the blue chip to form a white LED.The white LED is fixed inside the integrating sphere’s bracket to perform a constant temperature and variable current excitation test.The ambient temperature of the test was 15℃,and a pulse driving current of 150--1000 mA was applied.The photoluminescence(PL)spectra and the photoelectric data of the whit

关 键 词：材料 发光二极管 光谱 峰值波长 荧光陶瓷 激发电流 温度 

分 类 号：O436[机械工程—光学工程]