Achieving High Quantum Efficiency Narrow-Band beta-Sialon:Eu2+ Phosphors for High-Brightness LCD Backlights by Reducing the Eu3+ Luminescence Killer

doi:10.1021/acs.chemmater.7b04605

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	Achieving High Quantum Efficiency Narrow-Band beta-Sialon:Eu2+ Phosphors for High-Brightness LCD Backlights by Reducing the Eu3+ Luminescence Killer
	Li, SX ; Wang, L ; Tang, DM ; Cho, YJ ; Liu, XJ ; Zhou, XT ; Lu, L ; Zhang, L ; Takeda, T ; Hirosaki, N ; Xie, RJ
	2018
发表期刊	CHEMISTRY OF MATERIALS
ISSN	0897-4756
卷号	30 期号:2 页码:494-505
文章类型	期刊论文
摘要	beta-Sialon:Eu2+ has been reported to be the most promising narrow-band green phosphor for wide color gamut LCD backlights, but the coexistence of the Eu3+ luminescence killer with the Eu2+ luminescence center limits its luminescence performance to a great extent. In this study, we propose a direct reduction strategy to successfully realize the reduction of Eu3+ to Eu2+ and, finally, increase the effective concentration of Eu2+ in the crystal lattice and greatly minimize the amount of Eu3+ on the particle surface. As a result, the luminescence of treated beta-sialon:Eu2+ is enhanced by 2.3 times, and the internal quantum efficiency significantly increases from 52.2 to 96.5%. The mechanisms for such large enhancements in luminescence are clarified by investigating the microstructure, luminescence spectra, valence state, concentration, and distribution of Eu using a variety of chemical analyses. We find that the low efficiency is ascribed to the coexistence of the Eu3+ luminescence killer with the Eu2+ luminescence center. The white LED backlight using the treated beta-sialon:Eu2+ demonstrates a high luminous efficacy of 136 lm W-1 (22.5% up) and a wide color gamut (similar to 96% National Television System Committee standard (NTSC)), which thus promises high brightness and energy saving. We believe that the strategy proposed in this work would also work for other luminescent materials containing mixed valence of dopants.
关键词	Wide-color Gamut Alpha-sialon Beta-sialon White Leds Reduction Crystal Photoluminescence Green Eu2++ Ca
DOI	10.1021/acs.chemmater.7b04605
收录类别	SCI
语种	英语
WOS记录号	WOS:000423418000024
引用统计
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/28919
专题	中科院上海应用物理研究所2011-2018年
作者单位	1.Li, SX 2.Wang, L 3.Tang, DM 4.Cho, YJ 5.Liu, XJ 6.Zhou, XT 7.Lu, L 8.Zhang, L 9.Takeda, T 10.Hirosaki, N 11.Xie, RJ
推荐引用方式 GB/T 7714	Li, SX,Wang, L,Tang, DM,et al. Achieving High Quantum Efficiency Narrow-Band beta-Sialon:Eu2+ Phosphors for High-Brightness LCD Backlights by Reducing the Eu3+ Luminescence Killer[J]. CHEMISTRY OF MATERIALS,2018,30(2):494-505.
APA	Li, SX.,Wang, L.,Tang, DM.,Cho, YJ.,Liu, XJ.,...&Xie, RJ.(2018).Achieving High Quantum Efficiency Narrow-Band beta-Sialon:Eu2+ Phosphors for High-Brightness LCD Backlights by Reducing the Eu3+ Luminescence Killer.CHEMISTRY OF MATERIALS,30(2),494-505.
MLA	Li, SX,et al."Achieving High Quantum Efficiency Narrow-Band beta-Sialon:Eu2+ Phosphors for High-Brightness LCD Backlights by Reducing the Eu3+ Luminescence Killer".CHEMISTRY OF MATERIALS 30.2(2018):494-505.

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