It is well known that cyan-emitting phosphors play a very important role in full-spectrum white LEDs. A large number of cyan-emitting phosphors have been reported in the past few years, however, most of them can only be effectively excited by near-ultraviolet light. There are very few cyan-emitting phosphors that can be intensively excited by blue light (440 and 470 nm). Here, a novel blue-light excitable cyan-emitting phosphor BaLu_1.95Ce_0.05Al₂Ga₂SiO₁₂ with excellent performance is reported. The cyan phosphor has a cubic structure in space group $Ia\overline{3}d$ with a = 1.205379(3) nm, which can be easily obtained through a solid-state reaction pathway. The emission peak of the cyan phosphor is located at 500 nm and its internal quantum efficiency is as high as 90.01% when excited at 455 nm at 25 °C. The cyan phosphor exhibits superior resistance against thermal quenching of luminescence, and its intensity at 125 °C is as strong as 92.14% of the intensity at room temperature. Meanwhile, it also shows an outstanding resistance against water, where its luminescence intensity is hardly changed after being immersed in pure water for 528 h. The white LED lamp prepared by employing the obtained BaLu_1.95Ce_0.05Al₂Ga₂SiO₁₂ as cyan phosphor displays remarkable optical properties with CCT = 4441 K, R_a = 93.7, CRI = 90.4 and CIE 1931 (x, y) as (x = 0.3648, y = 0.3752). The experimental results demonstrate that BaLu_1.95Ce_0.05Al₂Ga₂SiO₁₂ is a promising cyan-emitting phosphor with great application potential in full-spectrum white LEDs.

众所周知，发射青色的磷光体在全光谱白光 LED 中起着非常重要的作用。过去几年已经报道了大量发青色的荧光粉，但其中大部分只能被近紫外光有效激发。很少有青色荧光粉可以被蓝光（440 和 470 nm）强烈激发。在这里，报道了一种具有优异性能的新型蓝光可激发青色发光荧光粉 BaLu _1.95 Ce _0.05 Al ₂ Ga ₂ SiO ₁₂。青色荧光粉在空间群中具有立方结构$\mathrm{一世}\mathrm{一种}\overline{3}d$与一个 = 1.205379（3）纳米，其可以通过固态反应途径可以容易地获得。青色荧光粉的发射峰位于 500 nm，在 25 °C 下在 455 nm 激发时，其内部量子效率高达 90.01%。青色荧光粉对发光的热猝灭表现出优异的抵抗力，其在125°C下的强度高达室温下强度的92.14%。同时，它还表现出优异的耐水性，在纯水中浸泡528小时后，其发光强度几乎没有变化。采用所得BaLu _1.95 Ce _0.05 Al ₂ Ga ₂ SiO ₁₂制备白光LED灯由于青色荧光粉显示出显着的光学特性，CCT = 4441 K，R _a  = 93.7，CRI = 90.4，CIE 1931 ( x , y ) 为 ( x  = 0.3648, y  = 0.3752)。实验结果表明，BaLu _1.95 Ce _0.05 Al ₂ Ga ₂ SiO ₁₂是一种很有前途的青色荧光粉，在全光谱白光LED中具有很大的应用潜力。