全光谱照明LED中的蓝绿色荧光粉研究

采用高温固相法合成了BaSi₂O₂N₂:Eu²⁺蓝绿色荧光粉，在440~460 nm蓝光激发下，该荧光粉发射峰值波长488 nm的蓝绿色光。通过共掺杂微量Mg²⁺和Ge⁴⁺离子，BaSi₂O₂N₂:Eu²⁺蓝绿色荧光粉的热猝灭性能显著提升。在蓝光芯片激发下，使用BaSi₂O₂N₂:Eu²⁺蓝绿色荧光粉搭配Y₃（Al，Ga）₅O₁₂:Ce³⁺黄绿色荧光粉以及CaAlSiN₃:Eu²⁺红色荧光粉，可以封装色温6 500 K、显色指数Ra达到96.5、所有特殊显色指数R1~R15都大于90的全光谱白光LED。通过封装老化测试，Mg²⁺和Ge⁴⁺离子掺杂的BaSi₂O₂N₂:Eu²⁺蓝绿色荧光粉较未掺杂的荧光粉老化性能提升近1倍。

Blue-green Phosphors in Full Spectrum Lighting LEDs

BaSi₂O₂N₂:Eu²⁺ blue-green phosphor was synthesized by high temperature solid-state method. Under the excitation of blue light, BaSi₂O₂N₂:Eu²⁺ phosphor emits blue-green light with peak wavelength at 488 nm. Co-doped with Mg²⁺ and Ge⁴⁺ ions, the thermal quenching property of BaSi₂O₂N₂:Eu²⁺ was significantly improved, which helps to improve the aging performance of WLED. By using BaSi₂O₂N₂:Eu²⁺ blue-green phosphor, Y₃ (Al, Ga)₅O₁₂:Ce³⁺ yellow-green phosphor and CaAlSiN₃:Eu²⁺ red phosphors, the Ra of the blue-chip based WLED reaches 96.5, and all the special color rendering indices (R1-R15) of the WLED are over 90, which meet the requirements of full spectrum WLED lighting.