蓝光激发红色荧光粉的研究进展及其在白光LED中的应用

Research Progress and Applications of Blue Light Excited Red Phosphors for white LED

蓝光LED芯片激发黄色荧光粉是目前白光LED的主要实现方式,引入红色荧光粉对调整白光LED的显色指数及色温有重要意义。重点介绍和评述了可被蓝光激发且具有宽发射带的硫化物、氮化物、铝酸盐等几种体系红色荧光粉的发光性质、最新研究成果及在白光LED中的应用。对比发现,氮化物荧光粉可被从近紫外到可见绿光有效激发,随基质组成的不同,可发出峰值波长为600～650nm的红色荧光,且由于其优良的化学稳定性、热稳定性成为最有前途的一类红色荧光粉。采用两种以上的荧光粉代替单一黄色荧光粉,有利于调整白光LED的色温,提高显色指数。

Blue light-emitting diodes （LEDs） chip excited yellow phosphor is the main way to achieve white LEDs. It is important to introduce red phosphor into yellow phosphor on the adjustment of the color index and color temperature of white LEDs. This paper emphatically presents and reviews the luminescent properties, latest research development and application on white LED of the broad hand emission red phosphors of sulfide, nitride, aluminate phosphors excited by blue chips. Through contrast, it is found that nitride phosphor is the most promising type of red phosphor because it can be effectively excited from the near ultraviolet to green light, emits red fluorescence peaking form 600nm to 650nm following various of the matrix composition and has excellent chemical stability, thermal stability. Two or more phosphors instead of single yellow LED and to improve the color rendering index. phosphor are conductive to adjust the color temperature of white