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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∶Eu~(2+)(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∶Eu~(2+)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,Eu~(2+)位于沿c轴方向的大孔道之中,并与6个最紧邻的(O,N)原子等距离配位。因而,Eu~(2+)的狭窄发射峰源自于Eu~(2+)局域结构的高度对称性。β-sialon∶Eu~(2+)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∶Eu~(2+)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∶Eu~(2+)成为应用于先进显示屏的极其重要的绿色发光材料。
The gallium nitride-based white light-emitting diode (LED) is currently a new backlight technology, widely used in wide color gamut, high-efficiency LCD screen. In this technology, the phosphor as the key material determines the gamut range, luminous efficiency and reliability of the backlight unit, so that it should have suitable emission wavelength and narrow-band emission. sialon: Eu2 + sialon: silicon aluminum oxynitride is a green phosphor that is ideally suited for backlight applications thanks to its emission peak at 525-545 nm and narrowing of only 55 nm The peak width. This paper reviews and summarizes the synthesis, spectroscopic properties, electronic structure, crystal structure, reliability and its specific applications of β-sialon: Eu 2+. Computational simulation and experimental results show that Eu 2+ is located in a large pore along the c-axis and equidistant from the nearest six (O, N) atoms. Thus, the narrow emission peak of Eu 2+ originates from the high degree of symmetry of Eu 2+ localized structure. The emission wavelength and bandwidth of β-sialon: Eu 2+ can be controlled by composition cutting, ie, z value; the low z value composition enables shorter wavelength emission and narrower bandwidth. Compared with the traditional YAG phosphor based backlight, the backlight with β-sialon: Eu 2+ combined with red phosphor has wider color gamut and improved color gamut range 15% or more. Its excellent luminescent properties and high reliability make β-sialon: Eu 2+ an extremely important green luminescent material for advanced displays.