导致单管型白光发光二极管快速光衰的实验研究  

Experimental Research on the Mechanism of Causing Fast Luminous Attenuation of White Lamp-LED

作　　者：吴海彬[1] 何素梅[1] 王昌铃 

机构地区：[1]福州大学机械工程及自动化学院,福建福州350108 [2]福建省苍乐电子企业有限公司,福建福州350007

出　　处：《光学学报》2009年第5期1363-1367,共5页Acta Optica Sinica

基　　金：福建省自然科学基金(A0610010)资助课题

摘　　要：很多国内封装的单管(Lamp)型白光发光二极管(LED)半光衰时间往往较短,这与大功率白光LED有很大不同。为了找出导致单管型白光LED快速光衰的真正原因,在分析国内外研究现状的基础上,对不同老化时期的白光LED样品进行解剖,并对封装内部结构材质的变化进行分析。实验发现两种现象,一是有些封装体内固晶胶产生黄变,二是有些蓝光芯片上表面会形成一层深黄色薄膜。去除黄变的固晶胶,或者清洗掉芯片上表面的薄膜后重新封装,白光LED光通量均会有较大提高。荧光粉胶体和固晶胶与蓝光芯片直接接触,并对其完全包围,这两种胶体材料的变性老化对单管型白光LED的光衰有直接重要的影响。The life of many white lamp-LEDs manufactured inland is normally short. This is very different from power white LEDs. The white lamp-LEDs for different aging period have been anatomized. The variety of structure materials in package has been discussed, in order to find the real reason for leading to fast lumen attenuation of the white LED, based on the past research work. By experiments, two phenomena have been found. the first is die attaching resin has been yellowed in some LEDs, the second is that there is a thin layer of deep yellow film on the top of blue dies. Then the blue dies after wiping off the die attaching resin or the thin yellow film have been packaged again, and luminous flux show a dramatic enhancement. Blue dies touch resin mixing phosphor and die attaching resin directly, and is surrounded by them. So the performance variation of two kind of resin has important and direct effect on luminous attenuation of white lamp-LEDs.

关 键 词：光学器件 单管型白光发光二极管 光衰 固晶胶 配粉胶 

分 类 号：TN312[电子电信—物理电子学]