| 论文题目 | Ultra-narrow band blue emission of Eu2+ in halogenated (Alumino)borate systems based on high lattice symmetry |
| 作 者 | ; Wei Yi,Y. Qu, M. S. Molokeev, C. C. Lin, T. S. Chan, C. K. Chang, Y. C. Chuang,Z. Y. Cheng*, J. Lin* |
| 发表年度 | MAY 2019 |
| 刊物名称 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY |
| 卷、期、页码 | 102; 5; 2353-2369 |
| 影响因子 | |
| 论文摘要 | Phosphor materials with ultra-high color purity are highly desired in backlit display and WLEDs. How to achieve high-purity three-primary emission in rare earth ions activated inorganic phosphors has become a hot topic. Herein, we reported ultra-narrow band and highly efficient blue-violet-emitting Eu2+-doped Ba2B5O9X (fwhm = 31 nm) and NaBa4(AlB4O9)(2)X-3 (X = Cl, Br) (fwhm = 43 nm) phosphors with peak positions around 424-437 nm. Especially, the color purity of Ba2B5O9Cl:Eu sample even exceeded 97%, its internal quantum efficiency could achieve 87%. The EXANES analysis revealed that the Eu mainly existed in the form of +2. According to the Rietveld structural refinement, extraordinarily narrow band emission should be attributed to the highly symmetric lattice structures with the flower-like polyhedrons in the studied (alumino)borate matrix. Significantly, the color gamut of as-prepared blue phosphor combined with the standard green and red phosphors was almost close to that of Rec. 2020 display standard. In addition, cation substitution strategy in NaBa4(AlxB5-xO9)(2)Cl-3 (x = 0-4) and NaBa4(GayB5-yO9)(2)Cl-3 (y = 0-3) samples successfully achieved spectra adjustment, and the underlying mechanism was proposed. All these results demonstrate that the as-prepared phosphors could be superior blue-emitting candidates for backlit display as well as WLEDs. |
| 全文链接 | https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/jace.16127 |
| 附件地址 |
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