CdSe/ZnS量子点白光器件的热稳定性

Thermal Stability of CdSe/ZnS Quantum Dot White Light Device

测量了一种绿色和红色CdSe/ZnS量子点/硅胶复合薄膜的吸收光谱和光致发光光谱。结果表明,量子点薄膜在不同的激发波长下,拥有稳定的光致发光光谱,峰值波长分别为527 nm和628 nm。将量子点/硅胶复合薄膜与YAG\:Ce3+黄色荧光粉结合,制备了两种不同结构的白色发光二极管(WLED),测量了其在不同驱动电流下的光学性能和表面温度。在350 mA的驱动电流下,Ⅱ号WLED的表面温度比Ⅰ号WLED低26.5℃。在55℃温度和55%相对湿度条件下进行老化实验。结果表明,在不同的驱动电流下两种WLED的光学性能基本一致且稳定性良好。

The absorption and photoluminescence spectra of green and red CdSe/ZnS quantum dot/silicon composite films are measured.The results show that the composite films have stable photoluminescence spectra at different excitation wavelengths and the peaks are located at 527 nm and 628 nm wavelengths,respectively.Two white light emitting diodes(WLED)with different structures are prepared by the combination of the quantum dot/silicon composite films with YAG\:Ce3+yellow phosphors,and their optical properties and surface temperatures are measured under different driving currents.For 350 mA driving current,the surface temperature of WLED II is 26.5℃lower than that of WLED I.The aging test is conducted at 55℃temperature and 55%relative humidity,and the results show that the optical performances of these two WLEDs typically remain the same under different driving currents,indicating an excellent stability.