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题名: Understanding the Local and Electronic Structures toward Enhanced Thermal Stable Luminescence of CaAlSiN3:Eu2+
作者: Chen, L; Fei, M; Zhang, Z; Jiang, Y; Chen, SF; Dong, YQ; Sun, ZH; Zhao, Z; Fu, YB; He, JH; Li, C; Jiang, Z
刊名: CHEMISTRY OF MATERIALS
出版日期: 2016
卷号: 28, 期号:15, 页码:5505-5515
DOI: 10.1021/acs.chemmater.6b02121
通讯作者: Chen, L (reprint author), Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China. ; Chen, SF (reprint author), Anhui Sci & Technol Univ, Dept Chem, Fengyang 233100, Peoples R China.
文章类型: 期刊论文
英文摘要: It is a great challenge to maintain thermally stable luminescence of red phosphors in white light-emitting diodes (LEDs), because of the large Stokes shift. For the purpose of overcoming this challenge, this work elucidates the intrinsic mechanism of the thermal quenching luminescence of CaAlSiN3:Eu2+. The empty 5d orbital of Eu2+ is partly filled with electrons upon Eu2+ increasing, as observed using XANES; and the exceptional expansion of the local Eu-N bond length, the ratio of which is far larger than the volume expansion of crystal lattice brought by doping Eu2+, is measured using EXAFS. The shift of Fermi level predicted with the first-principles calculations is confirmed by the valence band spectra. Therefore, the changeable distribution of electrons on the excited substates and then thermal delocalization to the conduction band are the intrinsic mechanisms of thermal quenching luminescence of CaAlSiN3:Eu2+. The results provide a solid basis for exploring the methods to enhance the thermal stable luminescence of CaAlSiN3:Eu2+.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000381320700037
ISSN号: 0897-4756
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26673
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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文件名: Understanding the Local and Electronic Structures toward Enhanced Thermal Stable Luminescence of CaAlSiN3_Eu2+.pdf
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