Zhao Ming, Liao Hongxu, Molokeev Maxim S, Zhou Yayun, Zhang Qinyuan, Liu Quanlin, Xia Zhiguo
1The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, 100083 Beijing, China.
2Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk,, 660036 Russia.
Light Sci Appl. 2019 Apr 10;8:38. doi: 10.1038/s41377-019-0148-8. eCollection 2019.
Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent materials. The discovery of cyan-emitting (470-500 nm) phosphors is a challenge to compensate for the spectral gap and produce full-spectrum white light. NaKLiSiO:Eu (NKLSO:Eu) phosphor was developed with impressive properties, providing cyan emission at 486 nm with a narrow full width at half maximum (FWHM) of only 20.7 nm, and good thermal stability with an integrated emission loss of only 7% at 150 °C. The ultra-narrow-band cyan emission results from the high-symmetry cation sites, leading to almost ideal cubic coordination for UCrC-type compounds. NKLSO:Eu phosphor allows the valley between the blue and yellow emission peaks in the white LED device to be filled, and the color-rendering index can be enhanced from 86 to 95.2, suggesting great applications in full-spectrum white LEDs.
磷光转换白光发光二极管依靠将发射蓝光的氮化铟镓芯片与发射黄、红光的发光材料相结合。发现发射青色（470 - 500纳米）的磷光体是一项挑战，其目的是弥补光谱间隙并产生全光谱白光。钠钾锂硅酸盐：铕（NKLSO:Eu）磷光体具有令人印象深刻的特性，在486纳米处发出青色光，半高宽极窄，仅为20.7纳米，并且具有良好的热稳定性，在150°C时积分发射损失仅为7%。这种超窄带青色发射源于高对称阳离子位点，使得UCrC型化合物具有近乎理想的立方配位。NKLSO:Eu磷光体能够填补白光发光二极管器件中蓝色和黄色发射峰之间的谷值，并且显色指数可以从86提高到95.2，这表明其在全光谱白光发光二极管中具有巨大的应用潜力。
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