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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
Source PublicationCHEMISTRY OF MATERIALS
ISSN0897-4756
Volume30Issue:2Pages:494-505
Subtype期刊论文
Abstractbeta-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.
KeywordWide-color Gamut Alpha-sialon Beta-sialon White Leds Reduction Crystal Photoluminescence Green Eu2++ Ca
DOI10.1021/acs.chemmater.7b04605
Indexed BySCI
Language英语
WOS IDWOS:000423418000024
Citation statistics
Cited Times:41[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/28919
Collection中科院上海应用物理研究所2011-2019年
Affiliation1.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
Recommended Citation
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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