基于氮化镓的白光发光二极管(LED)是目前一项崭新的背光源技术,广泛应用于宽色域、高光效的液晶显示屏.在此项技术中,作为关键材料的荧光粉决定着背光单元的色域范围、发光效率和可靠性,因而要求它应具合适的发射波长和窄带发射.β-sialon∶ Eu2+(sialon:silicon aluminum oxynitride(赛龙))就是一款非常适合背光应用的绿色荧光粉,这得益于其位于525 ～ 545 nm发射峰和只有55 nm狭窄的峰宽.此文回顾和综述了β-sialon∶ Eu2+的合成方法、光谱特性、电子结构、晶体结构、可靠性和它的具体应用.计算模拟和实验测试结果表明,Eu2+位于沿c轴方向的大孔道之中,并与6个最紧邻的(0,N)原子等距离配位.因而,Eu2+的狭窄发射峰源自于Eu2+局域结构的高度对称性.β-sialon∶ Eu2+的发射波长和带宽都能通过组成裁剪,即z值,进行调控;低z值组成能够实现更短波长发射和更窄带宽.与传统的基于钇铝石榴石(YAG)荧光粉的背光源相比,β-sialon∶ Eu2+再搭配红色荧光粉制备的背光源具有更宽的色域,色域范围可提高15％以上.其优异的发光性能和高可靠性使得β-sialon∶ Eu2+成为应用于先进显示屏的极其重要的绿色发光材料.
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