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
ISSN0897-4756
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
DOI10.1021/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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