摘要
传统“荧光粉+有机硅脂”荧光转换体的热导率低,且物理化学稳定性差,不能应用于高功率白光LED领域。全无机荧光块体材料可以规避有机封装,具有更高的热导率,但这类材料面临着成本高且极难实现立体结构的问题。本工作基于非晶态纳米二氧化硅,得到一种包含(Gd,Y)AG:Ce荧光粉、可在紫外光下固化的浆料,并通过光固化成型、空气排脂、无压烧结,制备了一种(Gd,Y)AG:Ce荧光粉–石英玻璃复合材料。该荧光玻璃陶瓷在蓝光激发下发射峰值位于575nm的宽带橙黄光,且内量子效率大于90%。研究结果表明,在致密化烧结过程中,(Gd,Y)AG:Ce荧光粉与石英玻璃之间的界面反应非常微弱,因此荧光粉能够完好地嵌入到石英玻璃中。该全无机荧光转换体可以用于封装相关色温小于4500 K、显色指数大于75和流明效率为74 lm·W^(–1)的高功率暖白光LED。所构建的激光照明器件的饱和激光功率密度可达2.84 W·mm^(–2),此时光通量为180 lm。此外,所提出的制备方法与3D打印兼容,可以批量化制造出具有复杂立体结构的荧光转换体。该技术有望推动高功率白光LED朝着个性化和模块化发展。
Because of low thermal conductivity and weak physical and chemical stabilities,traditional “phosphor in silicone” color converters are precluded from high-power white LED applications.All-inorganic bulk luminescence materials not only can circumvent organic encapsulation,but also have higher thermal conductivity.However,those bulk materials are high in cost and very difficult to be shaped into three-dimensional structures.Here,based on amorphous silica nanoparticles,a slurry,containing(Gd,Y)AG:Ce phosphor powders and can be polymerized under UV light,were developed.Bulk(Gd,Y)AG:Ce-silica glass composites were prepared successfully through photo curing,debinding in air and pressureless sintering.Under excitation of blue light,these luminescence glass-ceramics exhibit broadband orange emission peaking at 575 nm with internal quantum efficiency higher than 90%.Our results show that the interfacial reaction between(Gd,Y)AG:Ce and silica glass is very weak,and thus the former can be well embedded into bulk silica glass.Such all-inorganic color converters were further used to fabricate high-power warm white LEDs with correlated color temperature smaller than 4500 K,color rendering index higher than 75,and luminous efficiency of 74 lm·W^(–1).Luminescence saturation threshold of the as-fabricated laser lighting device is as high as 2.84 W·mm^(–2),where its luminous flux can achieve 180 lm.Moreover,preparation of(Gd,Y)AG:Ce-silica glass composites is compatible to 3D printing technology,thus allowing the mass manufacturing of color converters with complex 3D structures,which may promote personalization and modularization of high-power white LEDs.
作者
李琪
黄羿
钱滨
许贝贝
陈莉英
肖文戈
邱建荣
LI Qi;HUANG Yi;QIAN Bin;XU Beibei;CHEN Liying;XIAO Wenge;QIU Jianrong(School of Optical Science and Engineering,Zhejiang University,Hangzhou 310027,China;Ningbo Ingenuity Rapid Prototyping Technology Co.,Ltd.,Ningbo 315000,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第3期289-296,共8页
Journal of Inorganic Materials
基金
浙江省重点研发计划(2021C01024)
中国博士后科学基金(2021M692840)
浙江大学现代光学仪器国家重点实验室开放基金。
关键词
荧光粉
玻璃陶瓷
暖白光
3D打印
phosphors
glass-ceramics
warm white light
3D printing
