A near-infrared phosphor doped with Cr3+ towards zero-thermal-quenching for high-power LEDs

被引：48

作者：

Li, J. ^{[1
]}

Zhe, H. ^{[1
]}

Ming, H. ^{[2
]}

Zhou, Y. ^{[2
]}

Ye, Y. ^{[1
]}

Zhou, Q. ^{[1
]}

Wang, Z. ^{[1
]}

机构：

[1] Yunnan Minzu Univ, State Ethn Affairs Commiss, Key Lab Green Chem Mat Univ Yunnan Prov, Key Lab Adv Synthet Chem,Sch Chem & Environm, Kunming 650500, Yunnan, Peoples R China

[2] South China Univ Technol, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, State Key Lab Luminescent Mat & Devices, Guangzhou 510641, Peoples R China

来源：

MATERIALS TODAY CHEMISTRY | 2022年 / 24卷

基金：

中国国家自然科学基金;

关键词：

Cr3+-activated NIR phosphors; Fluorides; High thermal stability; Non-destructive testing; Veins imaging; NIR LEDs; LIGHT-SOURCES; LUMINESCENCE; EMISSION; FLUORIDE;

D O I：

10.1016/j.mtchem.2022.100839

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Cr3+-doped phosphors show significant application potential in near-infrared (NIR) light-emitting diodes (LEDs). However, the development of thermally stable and efficient NIR phosphors still faces enormous challenges. Herein, NIR phosphors K2NaMF6:Cr3+ (M3+ = Al3+, Ga3+, and In3+) were synthesized by the hydrothermal method. The represented K2NaAlF6:Cr3+ phosphor can be effectively excited by blue light (similar to 430 nm) to present broadband emission at half a maximum of 96 nm peaking at similar to 728 nm. Meanwhile, the K2NaAlF6:Cr3+ phosphor exhibits excellent internal quantum efficiency (IQE = 68.08%) and nearly zero-thermal-quenching behavior, which is able to maintain 96.5% emission intensity at 150 degrees C of the initial value at 25 degrees C. The NIR phosphor-converted LED was fabricated based on K2NaAlF6:Cr3+ phosphor and a blue LED chip, showing a NIR output power of 394.39 mW at 300 mA with a high photoelectric conversion efficiency of 10.9% at 20 mA. Using the high-power NIR LED as a lighting source, transparent and quick veins imaging as well as non-destructive testing were demonstrated, suggesting the NIR phosphor has a wide range of practical applications. (c) 2022 Elsevier Ltd. All rights reserved.

引用

页数：7

共 37 条

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