YAG:Ce^(3+)玻璃陶瓷白光LED的发光特性

Photoluminescence properties of the Ce^(3+)-doped yttrium aluminum garnet glass-ceramic white LED

用化学共沉淀法制备掺铈钇铝石榴石(YAG:Ce3+)前驱体,以B2O3-Al2O3-SiO2-Na2O为玻璃基质制作Ce3+掺杂YAG玻璃陶瓷,并封装成玻璃陶瓷白光发光二极管(LED)。改变玻璃陶瓷基片厚度和外形,测量玻璃陶瓷白光LED的光电色参数,并与常规涂敷YAG荧光粉方法制作的白光LED进行对照比较。结果表明,玻璃陶瓷白光LED发射光谱波形与普通白光LED光谱基本一致。玻璃陶瓷基片从0.50mm变化到0.90mm厚时,相关色温(CCT)从4 182 K增加到8862K。0.60mm厚平板玻璃陶瓷基片封装成的白光LED荧光能量转换效率约为20%,中心CCT为6396K,-85°和+85°视角CCT分别为5921K和5898K;而平凸玻璃陶瓷基片封装成的白光LED,-85°和+85°视角CCT变化范围可控制在150K范围内。

The chemical co-precipitation is used to prepare YAG：Ce3＋ precursors, and B2O3-Al2O3-SiO2-Na2O is as the glass substrate,so the Ce3＋-doped YAG glass-ceramic is fabricated,and then packaged into a glass-ceramic white LED.The photoelectric color parameters of the glass-ceramic white LED are measured by changing the substrate thickness and shape,and compared with those obtained by the conventional YAG phosphor coating method.The results show that the emission spectrum of the glass-ceramic white LED is essentially the same as that of ordinary white LEDs.When the glass-ceramic substrate thickness is between 0.50 mm and 0.90 mm,the correlated color temperature（CCT） ranges from 4 182 K to 8 862 K.The fluorescence energy conversion efficiency of the glass-ceramic white LED with 0.60 mm-thick substrate is about 20%,its central CCT is 6 396 K,and the -85° and ＋85°perspective-related color temperatures are 5 921 K and 5 898 K,respectively.For the white LED with plano-convex glass-ceramic substrate,-85° and ＋85°perspective-related color temperatures can be controlled in the 150 K range.