中文摘要：

采用荧光分光光度计测量不同种类荧光粉样品的光谱特性，分析橙色及红色荧光粉的添加对白光LED光学特性的影响．室温光致发光测量表明，橙色及红色荧光粉的发光强度明显弱于黄绿色荧光粉，其峰值强度分别只有黄绿色荧光粉峰值强度的21．5％和7．2％．在黄绿色荧光粉中添加20％含量的橙色或红色荧光粉后，样品在绿光波段的发光强度大幅下降，而在橙、红光波段的发光强度变化很小，表明白光LED显色性的提高主要是绿光强度的下降导致的．扫描电子显微镜测量表明，黄绿色荧光粉为粒径101,Lm左右的球形颗粒，而橙色及红色荧光粉的颗粒尺寸较小，且多为片状颗粒．因此，橙色及红色荧光粉对入射蓝光的反射光强度分别是黄绿色荧光粉的3．叭倍和3．23倍，这是其光致发光强度远小于黄绿色荧光粉的主要原因．

英文摘要：

The spectral characteristics of different species of phosphors samples were measured by Fluorescence Spectrophotometer, and the effects of the orange and red phosphors on the white LED optical properties were ana- lyzed. Photoluminescence （PL） in room temperature reveals that the luminous intensity of orange and red phos- phors is significantly weaker than that of yellow-green phosphors, with the respective peak intensity of only 21. 5% and 7.2% compared with that of the yellow-green phosphors. The luminous intensity in the green band drops significantly by adding 20% of the content of orange or red phosphors in yellow-green phosphor, while the emission intensity of orange and red band changes very little. It indicates that the improvement of white LED col- or rendering index is mainly due to the decrease of the green band＇s intensity. Scanning Electron Microscopy （SEM） shows that the yellow-green phosphors are of spherical particle size about 10 I~m, and the orange or red phosphors are of the smaller particle size and more for the tabular grains. Therefore, the orange and red phos- phors＂ intensity of reflected light is respectively 3.01 times and 3.23 times that of yellow-green phosphors （ the incident light was blue）, which is the main reason that the photoluminescence intensity is much smaller than that of the yellow-green phosphors.