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Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.


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Efficient spectral regulation in Ce:Lu3(Al,Cr)5O12 and Ce:Lu3(Al,Cr)5O12/Ce:Y3Al5O12 transparent ceramics with high color rendering index for high-power white LEDs/LDs

Show Author's information Tianyuan ZHOUaChen HOUaLe ZHANGa,c,d( )Yuelong MAa,bJian KANGa,cTao LIaRui WANGaJin HUANGaJunwei LIaHaidong RENeZhenxiao FUeFarida A. SELIMdMing LIfHao CHENa,c( )
Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronics Engineering, Jiangsu Normal University, Xuzhou 221116, China
School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology, Xuzhou 221400, China
Department of Physics and Astronomy, Bowling Green State University, Bowling Green 43403, USA
State Key Laboratory of Advanced Materials and Electronic Components, Guangdong Fenghua Advanced Technology Holding Co., Ltd., Zhaoqing 526020, China
Department of Mechanical, Materials and Manufacturing, University of Nottingham, Nottingham NG14BU, UK

Abstract

Realizing a high color rendering index (CRI) in Ce:LuAG transparent ceramics (TCs) with desired thermal stability is essential to their applications in white LEDs/LDs as color converters. In this study, based on the scheme of configuring the red component by Cr3+ doping, an efficient spectral regulation was realized in Ce,Cr:LuAG TCs. A unilateral shift phenomenon could be observed in both photoluminescence (PL) and photoluminescence excitation (PLE) spectra of TCs. By constructing TC-based white LED/LD devices in a remote excitation mode, luminescence properties of Ce,Cr:LuAG TCs were systematically investigated. The CRI values of Ce:LuAG TC based white LEDs could be increased by a magnitude of 46.2%. Particularly, by combining the as fabricated Ce,Cr:LuAG TCs with a 0.5 at% Ce:YAG TC, surprising CRI values of 88 and 85.5 were obtained in TC based white LEDs and LDs, respectively. Therefore, Ce,Cr:LuAG TC is a highly promising color convertor for high-power white LEDs/LDs applied in general lighting and displaying.

Keywords:

Ce,Cr:LuAG TC, spectral regulation, energy transfer, color rendering index (CRI), white LEDs/LDs
Received: 04 January 2021 Revised: 07 May 2021 Accepted: 08 May 2021 Published: 14 July 2021 Issue date: October 2021
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Publication history

Received: 04 January 2021
Revised: 07 May 2021
Accepted: 08 May 2021
Published: 14 July 2021
Issue date: October 2021

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© The Author(s) 2021

Acknowledgements

The authors acknowledge the generous financial support from the National Natural Science Foundation of China (61975070, 51902143, 61971207, and 61775088), Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Key Research and Development Project of Jiangsu Province (BE2018062, BE2019033), Natural Science foundation of Jiangsu Province (BK20191467), Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX20_2336), International S&T Cooperation Program of Jiangsu Province (BZ2019063, BZ2020045, and BZ2020030), Natural Science Foundation of the Jiangsu Higher Education Institutes of China (19KJB430018, 20KJA430003), Special Project for Technology Innovation of Xuzhou City (KC19250, KC20201, and KC20244), and Open Project of State Key Laboratory of Advanced Materials and Electronic Components (FHR-JS-202011017).

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