Broadband emission of Lu2SrAl4SiO12:Eu2+ phosphor for full-spectrum lighting

Tao Hu; Zhiguo Xia; Qinyuan Zhang

Optical Materials: X (Jan 2022)

Broadband emission of Lu2SrAl4SiO12:Eu2+ phosphor for full-spectrum lighting

Tao Hu,
Zhiguo Xia,
Qinyuan Zhang

Affiliations

Tao Hu: School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, China
Zhiguo Xia: Corresponding author. School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, China.; School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, China
Qinyuan Zhang: Corresponding author. School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, China.; School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, Guangdong, China

Journal volume & issue: Vol. 13
p. 100138

Abstract

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Single-component broadband white-emitting phosphor is essential in next-generation white light-emitting diodes (WLEDs) devices for full-spectrum lighting applications. Herein, we report an ultra-broadband emitting Lu2SrAl4SiO12:Eu2+ phosphor with the full width at half maximum (FWHM) of ∼245–260 nm. Detailed analysis of the broadband emission mechanism reveals that it consists of two emission bands originating from Eu2+: one is the normal 4f65d1 →4f7(8S7/2) transition, and another is related with Eu2+-Eu3+ intervalence charge transfer (IVCT) emission with bandwidth of 210 nm. Moreover, the broad IVCT emission can be also suppressed by Be2+ doping, forming a narrow-band emission with FWHM = ∼75 nm. A warm WLED with a low correlated color temperature (CCT) of 3373 K and high CIR (Ra) of 85.7 is obtained by coating the broadband Lu2SrAl4SiO12:Eu2+ phosphor on an UV pumping LED, implying its application in full-spectrum warm white lighting.

Published in Optical Materials: X

ISSN: 2590-1478 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: https://www.journals.elsevier.com/optical-materials-x

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