Preparation and optical properties of MgAl2O4-Ce:GdYAG composite ceramic phosphors for white LEDs

Preparation and optical properties of MgAl2O4-Ce:GdYAG composite ceramic phosphors for white LEDs
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白光LED用MgAl2O4-Ce:GdYAG复合陶瓷荧光粉的制备及光学性能

DOI:
10.1016/j.jeurceramsoc.2019.07.027
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发表时间:
2019-12
期刊:
J. Eur. Ceram. Soc.
影响因子:
--
通讯作者:
Jiang Li
Jiang Li
中科院分区:
其他
文献类型:
--
作者:
Xin Liu;Xinglu Qian;Peng Zheng;Zewang Hu;Xiaopu Chen;Hongming Pan;Jun Zou;Rongjun Xie;Jiang Li

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大功率发光二极管(LED)照明在高亮度应用中引起了极大的关注。然而,具有高稳定性、高导热性和高效率的彩色转换器却很少。在这项工作中,我们开发了有前途的MgAl 2 O 4-Ce:GdYAG复合陶瓷颜色转换器,其中宽带黄色发光荧光体Ce:GdYAG与热稳定的尖晶石相MgAl 2 O 4相结合。研究了样品的微观结构、物相组成、光致发光和热稳定性。当MgAl 2 O 4与Ce:GdYAG的摩尔比为1.0、厚度为0.2mm时,该复合陶瓷荧光粉与蓝光LED封装后,获得了108.4lm/W的高光效值、70的高CRI值和4543的低CCT值。复合陶瓷荧光粉的光散射性质使其成为高亮度白色LED的理想和有前途的候选者。
High-power light-emitting-diode (LED) lighting has attracted great attention in high-luminance applications. However, the color converters with high stability, high thermal conductivity and high efficiency are scarce. In this work, we developed promising MgAl2O4-Ce:GdYAG composite ceramic color converters in which a broadband yellow-emitting phosphor Ce:GdYAG is combined with a thermally stable spinel phase MgAl2O4. The microstructure, phase composition, photoluminescence and thermal stability were investigated in detail. After being packaged with blue LED, a high luminous efficacy value of 108.4 lm/W is achieved by the composite ceramic phosphor with the molar ratio (MgAl2O4to Ce:GdYAG) of 1.0 and the thickness of 0.2 mm, as well as high CRI value of 70 and low CCT value of 4543. The light scattering nature of composite ceramic phosphors makes them an ideal and promising candidate for high-brightness white LEDs.
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