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白光LED已经广泛应用于LCD背光显示领域,然而,如何实现更广色域的显示,成为目前新的问题与研究热点。由于液晶背光源通常都使用滤光片,以期获得更广的色域范围和发光效率,因此若能使绿光荧光粉产生窄带发射,则可显著扩大背光源的色域面积。通过采用“蓝光LED芯片+β-SiAlON:Eu~(2+)(λem=525nm;FWHM~50nm)绿色荧光粉+K_2SiF_6:Mn~(4+)红色荧光粉”的封装方案能够实现目前基于荧光粉技术的最大色域面积。对于β-SiAlON:Eu~(2+)荧光粉而言,仍然对其发光性质缺乏清晰的认识。本文简要地总结了近年来β-SiAlON:Eu~(2+)绿色荧光粉的研究进展,分析其结构与光谱之间的关系,以期为能够实现更窄谱带、更高发光效率的β-SiAlON:Eu~(2+)绿色荧光粉提供思路,最终实现更广色域显示的目的。
White LED has been widely used in LCD backlight display area, however, how to achieve a wider color gamut display has become a new problem and research hot spot. Since liquid crystal backlights usually use filters in order to obtain a wider range of color gamut and luminous efficiency, if the green fluorescent powder can be narrowband emission, the color gamut area of the backlight can be significantly enlarged. By adopting the package solution of “blue LED chip + β-SiAlON: Eu ~ (2 +) (λem = 525nm; FWHM ~ 50nm) green phosphor + K_2SiF_6: Mn ~ (4+) red phosphor” Maximum color gamut area based on phosphor technology. For β-SiAlON: Eu 2+ phosphors, their luminescent properties are still lack of clear understanding. This article briefly summarizes the recent progress in the research of β-SiAlON: Eu 2+ green phosphors, and analyzes the relationship between the structure and the spectra of the phosphors. SiAlON: Eu ~ (2+) green phosphor provides the idea of eventually realizing a wider color gamut display.