Synthesis and optical properties of highly efficient Na3KMg7(PO4)6∶Eu2+blue phosphor for full-spectrum white-light-emitting diodes:The role of Li2CO3 flux

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外文摘要：Full-spectrum phosphor-converted white-light-emitting diodes(pc-WLED)are emerging as a main-stream technology in semiconductor lighting.Nevertheless,high-performance blue phosphor which can be excited efficiently by a 400 nm NUV diode chip is still lacking.Herein,we present a blue-emitting Na3KMg7(PO4)6∶Eu2+phosphor synthesized by the solid-reaction method.Particularly,we find that the using of Li2CO3 as flux can significantly improve the crystal quality and thus the emission efficiency of the phosphor.Meanwhile,the excitation peak of the phosphor shifts from 365 to 400 nm,which is pivotal for efficient NUV(400 nm)diode chip excitation.The practical Eu2+concentration is also enhanced by using Li2CO3 as flux,and the absorption efficiency is greatly increased.This phosphor ex-hibits superior PL thermal stability,namely retains 94％integrated photoluminescence intensity at 150 ℃ of that at 25 ℃.As a result,the optimized phosphor shows an emission band peaked at 437 nm with a bandwidth of 40 nm and a high external photoluminescence quantum yield of 51.7％.Finally,a pc-WLED was fabricated by using NKMPO∶Eu2+blue,Sr2SiO4∶Eu2+green,CaAlSiN3∶Eu2+red phosphors,and a 400 nm NUV diode chip.It shows a high color rendering index of Ra=96.4 and a correlated color temperature of 4358 K.These results prove that NKMPO∶Eu2+is a promising blue phosphor for full-spectrum WLED based on NUV diode chips.

外文关键词：

Eu2+Blue phosphorNa3KMg7(PO4)6Full-spectrum white LEDsRare earths

作者：

Zihao Wang、Sisi Liang、Chenyang Zhan、Kunyuan Xu、Jie Hu、Dejian Chen、Liping Song、Haomiao Zhu

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作者单位：

School of Physics and Materials Science,Nanchang University,Nanchang,330000,China

Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,341000,China

CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,350002,China

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Research Center of Rare Earth Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen,361021,China

Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Research Center of Rare Earth Materials,Haixi Institute,C

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基金：

National Natural Science Foundation of China

项目编号：

11974351

出版年：

2024

DOI：

10.1016/j.jre.2023.04.014

稀土学报(英文版)

中国稀土学会

稀土学报(英文版)

CSTPCDEI

影响因子：1.3

ISSN：1002-0721

年,卷(期)：2024.42(7)