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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 | |
| 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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