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Journal of Advanced Ceramics 2023, 12(12): 2331-2344 https://doi.org/10.26599/JAC.2023.9220823
Research Article | Open Access | Issue | Published: 04 January 2024

Biphasic (Lu,Gd)3Al5O12-based transparent nanoceramic color converters for high-power white LED/LD lighting

Show Author's Information Jie Fua,b,d,  Ying Zhangb,d,  Shaowei Fengb,d,  Mathieu Allixc,  Cécile Genevoisc,  Emmanuel Veronc,  Zhibiao Maa,  Wenlong Xua,  Linghan Baia,  Ruyu Fana,  Yafeng Yangb,d,  Hui Wangb,d,  Jianqiang Lia,e( )
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
CNRS, CEMHTI UPR 3079, Univ. Orléans, Orléans 45071, France
University of Chinese Academy of Sciences, Beijing 100049, China
Beijing Key Laboratory for Advanced Powder Metallurgy and Particulate Materials, University of Science and Technology Beijing, Beijing 100083, China
Keywords:
glass crystallization, high-power WLEDs/LDs, white lighting, (Lu,Gd)3Al5O12 (LuGAG)–Al2O3 nanoceramics
Cite this article:
Fu J, Zhang Y, Feng S, et al. Biphasic (Lu,Gd)3Al5O12-based transparent nanoceramic color converters for high-power white LED/LD lighting. Journal of Advanced Ceramics, 2023, 12(12): 2331-2344. https://doi.org/10.26599/JAC.2023.9220823
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Abstract Full text Electronic supplementary material About this article

Ce doped Lu3Al5O12 (Ce:LuAG) transparent ceramics are considered as promising color converters for solid-state lighting because of their excellent luminous efficiency, high thermal quenching temperature, and good thermal stability. However, Ce:LuAG ceramics mainly emit green light. The shortage of red light as well as the expensive price of Lu compounds are hindering their application for white lighting. In this work, transparent (Lu,Gd)3Al5O12–Al2O3 (LuGAG–Al2O3) nanoceramics with different replacing contents of Gd3+ (10%–50%) were successfully elaborated via a glass-crystallization method. The obtained ceramics with full nanoscale grains are composed of the main LuGAG crystalline phase and secondary Al2O3 phase, exhibiting eminent transparency of 81.0%@780 nm. After doping by Ce3+, the Ce:LuGAG–Al2O3 nanoceramics show a significant red shift (510 nm→550 nm) and make up for the deficiency of red light component in the emission spectrum. The Ce:LuAG–Al2O3 nanoceramics with 20% Gd3+ show high internal quantum efficiency (81.5% in internal quantum efficiency (IQE), 96.7% of Ce:LuAG–Al2O3 nanoceramics) and good thermal stability (only 9% loss in IQE at 150 ℃). When combined with blue LED chips (10 W), 0.3%Ce:LuGAG–Al2O3 nanoceramics with 20% Gd3+ successfully realize the high-quality warm white LED lighting with a color coordinate of (0.3566, 0.435), a color temperature of 4347 K, CRI of 67.7, and a luminous efficiency of 175.8 lm·W−1. When the transparent 0.3%Ce:LuGAG–Al2O3 nanoceramics are excited by blue laser (5 W·mm−2), the emission peak position redshifts from 517 to 570 nm, the emitted light exhibits a continuous change from green light to yellow light, and then to orange-yellow light, and the maximum luminous efficiency is up to 234.49 lm·W−1 (20% Gd3+). Taking into account the high quantum efficiency, good thermal stability, and excellent and adjustable luminous properties, the transparent Ce:LuGAG–Al2O3 nanoceramics with different Gd3+ substitution contents in this paper are believed to be promising candidates for high-power white LED/LD lighting.


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About this article

Biphasic (Lu,Gd)3Al5O12-based transparent nanoceramic color converters for high-power white LED/LD lighting

Show Author's information Jie Fua,b,d, Ying Zhangb,d, Shaowei Fengb,d, Mathieu Allixc, Cécile Genevoisc, Emmanuel Veronc, Zhibiao Maa, Wenlong Xua, Linghan Baia, Ruyu Fana, Yafeng Yangb,d, Hui Wangb,d, Jianqiang Lia,e( )
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
CNRS, CEMHTI UPR 3079, Univ. Orléans, Orléans 45071, France
University of Chinese Academy of Sciences, Beijing 100049, China
Beijing Key Laboratory for Advanced Powder Metallurgy and Particulate Materials, University of Science and Technology Beijing, Beijing 100083, China

Abstract

Ce doped Lu3Al5O12 (Ce:LuAG) transparent ceramics are considered as promising color converters for solid-state lighting because of their excellent luminous efficiency, high thermal quenching temperature, and good thermal stability. However, Ce:LuAG ceramics mainly emit green light. The shortage of red light as well as the expensive price of Lu compounds are hindering their application for white lighting. In this work, transparent (Lu,Gd)3Al5O12–Al2O3 (LuGAG–Al2O3) nanoceramics with different replacing contents of Gd3+ (10%–50%) were successfully elaborated via a glass-crystallization method. The obtained ceramics with full nanoscale grains are composed of the main LuGAG crystalline phase and secondary Al2O3 phase, exhibiting eminent transparency of 81.0%@780 nm. After doping by Ce3+, the Ce:LuGAG–Al2O3 nanoceramics show a significant red shift (510 nm→550 nm) and make up for the deficiency of red light component in the emission spectrum. The Ce:LuAG–Al2O3 nanoceramics with 20% Gd3+ show high internal quantum efficiency (81.5% in internal quantum efficiency (IQE), 96.7% of Ce:LuAG–Al2O3 nanoceramics) and good thermal stability (only 9% loss in IQE at 150 ℃). When combined with blue LED chips (10 W), 0.3%Ce:LuGAG–Al2O3 nanoceramics with 20% Gd3+ successfully realize the high-quality warm white LED lighting with a color coordinate of (0.3566, 0.435), a color temperature of 4347 K, CRI of 67.7, and a luminous efficiency of 175.8 lm·W−1. When the transparent 0.3%Ce:LuGAG–Al2O3 nanoceramics are excited by blue laser (5 W·mm−2), the emission peak position redshifts from 517 to 570 nm, the emitted light exhibits a continuous change from green light to yellow light, and then to orange-yellow light, and the maximum luminous efficiency is up to 234.49 lm·W−1 (20% Gd3+). Taking into account the high quantum efficiency, good thermal stability, and excellent and adjustable luminous properties, the transparent Ce:LuGAG–Al2O3 nanoceramics with different Gd3+ substitution contents in this paper are believed to be promising candidates for high-power white LED/LD lighting.

Keywords: glass crystallization, high-power WLEDs/LDs, white lighting, (Lu,Gd)3Al5O12 (LuGAG)–Al2O3 nanoceramics

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Publication history

Received: 30 August 2023
Revised: 08 October 2023
Accepted: 26 October 2023
Published: 04 January 2024
Issue date: December 2023

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© The Author(s) 2023.

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 51972304), Beijing Municipal Science & Technology Commission, Administrative Commission of Zhongguancun Science Park (No. Z221100006722022), the Project of Scientific Experiment on Chinese Manned Space Station, Chinese Academy of Sciences President’s International Fellowship Initiative for 2021 (No. 2021VEA0012), and the Fundamental Research Funds for the Central Universities. The project benefitted from the microscopy facilities of the Platform MACLE-CVL which was co-funded by the European Union and Centre-Val de Loire Region (FEDER).

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