紫光激发类太阳光LED用 Eu²⁺ 激活硅酸盐黄色荧光粉合成及发光性能

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关键词：熵增；高效；黄色荧光粉；类太阳光LED；健康照明中图分类号：0482.31 文献标识码：ADOI：10.37188/CJL.20250012 CSTR：32170.14.CJL.20250012

Abstract：Sunlike LEDs，with their advantages of excellent spectral continuity，high color rendering index （Ra）， highcolorfidelity （Rf）ℓ ，andhighcolorsaturation （Rg）， havebecome aninevitable trend in thefutureof healthylightingdevelopment.Efficientand stable multi-color phosphorsarethe keymaterialsforachieving sunlike/full-spectrum LEDs.In this paper，a novel violet-excited yellow phosphor， ⌊（Ba0.6Ca0.7Sr0.7）02-SiO2⌋：Eu2+ was synthesized using a high-temperature solid-state method basedon an entropy-increasing strategy.This phosphor，under 371nmultraviolet excitation，emits yellow lightwithaspectralrangeof 420-80Onmandacentralwavelengthof 56O nm，achieving an external quantum efficiency of 75% .Notably，under 4OO nm violet excitation，theluminous intensityof the phosphor can reach 88.2% of itsmaximum emission at the optimal excitation wavelength，achieving an external quantum efficiency of 53. 0% ，demonstrating good adaptability to violet chips.Finally，a sunlike LED was fabricated by combining the ⌊（Ba0.6Ca0.7Sr0.7）02-SiO2⌋：Eu2+ yellw phosphor with commercial red，blue，and cyan phosphors and coupling with a 410nm violetLED chip.The resultingLED exhibited high color rendering index（ Ra=96 ），high color saturation index （ Rg=100 ），and high color fidelity index （ Rf=95. 1 ）. The entropy-increasing strategy proposed in this studyalso provides anew approach for the development of novel high-efficiencyand stable phosphor systems.

Key Words：entropy-increasing；high efficiency;yellow phosphor;sunlike LED;healthy lighting

1引言

类太阳光LED的光谱分布接近自然阳光，具备较好的光谱连续性、高显色指数 （Ra） 、高色保真指数 （Rf） 和高色饱和度 Ξ（Rg） 等优点，是未来健康照明发展的必然趋势。（剩余15667字）