高亮度固态照明用LuYAG∶Ce荧光陶瓷

LuYAG∶Ce Transparent Ceramic Phosphors for High-brightness Solid-state Lighting Application

实现高发光效率、高亮度和良好的热稳定性是固态照明的迫切要求。因此,用于高功率发光二极管或激光二极管(LED/LD)的高性能荧光转换材料具有重要的研究意义。在这项工作中,通过将Lu^(3+)离子引入YAG∶Ce荧光陶瓷中方法作为有效策略来改善YAG∶Ce荧光材料的发光性能。采用固相反应和真空烧结法制Article ID:1000-7032(2023)06-0964^(-1)1收稿日期:2022^(-1)2-31;修订日期:2023-01-30基金项目:中国科学院战略性先导科技专项(XDA22010301)Supported by The Strategic Priority Research Program of The Chinese Academy of Sciences(XDA22010301)第6 HUANG Xinyou期,et al.:LuYAG∶Ce Transparent Ceramic Phosphors for High-brightness Solid-state…备了不同Lu^(3+)含量的(Lu,Y)_(3)Al_(5)O_(12)∶Ce荧光陶瓷(LuYAG∶Ce荧光陶瓷)。随着Lu^(3+)含量的增加,LuYAG∶Ce荧光陶瓷中的Y^(3+)位点被Lu^(3+)位点取代,Ce^(3+)的发射峰呈现从573 nm到563 nm的蓝移现象。当Lu^(3+)含量为60%时,通过将LuYAG∶Ce荧光陶瓷与蓝光LED组合,其发光强度达到最大值,流明效率达到114 lm∙W^(-1)。使用450 nm激光源与LuYAG∶Ce荧光陶瓷构建了透射模式下的激光驱动照明装置。随着功率密度从2.2 W·mm^(-2)增加到39 W·mm^(-2),Lu^(3+)含量为60%的荧光陶瓷光通量从128 lm增加到1874 lm,且没有发光饱和的迹象,最佳发光效率达到128 lm·W^(-1)。因此,LuYAG∶Ce荧光陶瓷有望成为高功率LED/LD照明的潜在荧光转换材料。

Achieving high luminous efficiency,high brightness and good thermal stability is an urgent requirement for solid-state lighting.Therefore,the high-performance color converters for high-power light-emitting diodes or laser diodes(LEDs/LDs)are significant to be explored.In this work,an effective strategy to improve the luminescent properties of YAG∶Ce color converters through method of component regulation was realized in YAG∶Ce transparent ceramic phosphors(TCPs)by incorporating Lu^(3+)ions.We prepared(Lu,Y)_(3)Al_(5)O_(12)∶Ce TCPs(LuYAG∶Ce TCPs)with different Lu^(3+)contents by the solid-state reaction and vacuum sintering method.With the increase of Lu^(3+)con-tent,the Y^(3+)sites in LuYAG∶Ce TCPs were substituted by Lu^(3+)sites,and the emission peaks of Ce^(3+)were blue-shift-ed from 573 nm to 563 nm.When the Lu^(3+)content was 60%,the emission intensity reached the maximum value and the luminous efficiency reached 114 lm∙W^(-1) by combining the LuYAG∶Ce TCPs with a blue LED.A 450 nm laser source was used to construct a laser-driven lighting device in a transmission mode.As the power density increased from 2.2 W·mm^(-2) to 39 W·mm^(-2),the luminous flux of the TCP with 60%Lu^(3+)substitution increased from 128 lm to 1874 lm with no signs of luminescence saturation and the optimum luminous efficiency reached 128 lm·W^(-1).Thus,the LuYAG∶Ce TCPs are expected to be potential color conversion materials for high-power LEDs/LDs lighting.