偶氮苯高分子的光致可逆固液转变

偶氮苯化合物是一种极具吸引力以及较为常用的光响应材料,本文主要介绍偶氮苯的光响应性质以及一些偶氮苯高分子的合成方法,解析光化学反应导致偶氮苯高分子固液转变的机理,并介绍其在粘结性材料、光致动器、光致热导开关器件及非热纳米压印中的应用。     

Sr3SiO5:Eu2+荧光粉的微波合成及性能研究

0 引 言 白光LED是一种具有广阔前景的节能照明灯具,被誉为人类的第四代照明用灯具.白光LED实现主要有两种方案,其中在蓝光LED芯片上涂覆黄色荧光粉,蓝光芯片发出的蓝光与荧光粉发出的黄光复合而获得白光,受到人们的重点关注[1-5].     

Sr3SiO5∶Eu2+荧光粉的微波合成及性能研究

Silicate orange yellow phosphor used in white-light LED was prepared by microwave method. The structure and optical properties of phosphor were studied. Sr₃SiO₅∶Eu²⁺ phosphor synthesized by microwave method is tetragonal structure of Sr₃SiO₅ with uniform particle distribution. Luminescence spectrum is a broad band spectrum peaking at 575 nm. The peak of excitation is at 532 nm and phosphor can be excited by blue LED. The warm white light was obtained combined phosphor and blue LED. The CIE chromaticity coordinates and correlated color temperature of white light is (x=0.394, y=0.341) and 3 239 K respectively.