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作者:

Chen, Xuean (Chen, Xuean.) | Zhao, Liang (Zhao, Liang.) | Chang, Xinan (Chang, Xinan.) | Xiao, Weiqiang (Xiao, Weiqiang.)

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EI Scopus SCIE

摘要:

Two alkali-earth and rare-earth metal borates, M3Eu2(BO3)(4) (M = Ba, Sr), have been synthesized and their crystal structures determined by single-crystal XRD methods with the following crystal data: Ba3Eu2(BO3)(4) (1), Pnma, a = 7.6970(15) angstrom, b = 16.554(3) angstrom, c = 8.9300(18) angstrom, V = 1137.8(4) angstrom(3), Z = 4; Sr3Eu2(BO3)(4) (2), Pnma, a = 22.2553(4) angstrom, b = 15.9122(3) angstrom, c = 8.7568(2) angstrom, V = 3101.05(11) angstrom(3), Z = 12. The compound 1 is isotypic with Ba3RE2(BO3)(4) (RE = Y, La, Pr, Nd) and its crystal structure features a 3D framework constructed by BO3 triangles and 8-fold coordinated positions M1, M2 and M3 with mixed Eu/Ba occupation. 2 adopts a threefold super-structure of the structure of 1. IR and Raman spectra further confirm that both 1 and 2 contain the planar triangular BO3 groups. The photoluminescence spectra of 1 and 2 consist of five groups of emission bands assigned to the D-5(0)-> F-7(j) (j = 0, 1, 2, 3, 4) transitions within Eu3+ ions and the decay curves show the single-exponential behavior with the lifetime being 1.358 and 0.887 ms for 1 and 2, respectively. 1 possess a very high luminescent efficiency (QE = 90.09%) which benefited to being applied in warm white LEDs. Moreover, X-ray photoelectron spectroscopy (XPS) is used to analyze the chemical states of the elements and the band electronic structure on 1 has also been investigated.

关键词:

Band structure Crystal structure Luminescent property Rare-earth borate M3Eu2(BO3)(4) (M = Ba, Sr)

作者机构:

  • [ 1 ] [Chen, Xuean]Beijing Univ Technol, Coll Mat Sci & Engn, Ping Le Yuan 100, Beijing 100124, Peoples R China
  • [ 2 ] [Zhao, Liang]Beijing Univ Technol, Coll Mat Sci & Engn, Ping Le Yuan 100, Beijing 100124, Peoples R China
  • [ 3 ] [Chang, Xinan]Beijing Univ Technol, Coll Mat Sci & Engn, Ping Le Yuan 100, Beijing 100124, Peoples R China
  • [ 4 ] [Xiao, Weiqiang]Beijing Univ Technol, Inst Microstruct & Property Adv Mat, Beijing 100124, Peoples R China

通讯作者信息:

  • [Chen, Xuean]Beijing Univ Technol, Coll Mat Sci & Engn, Ping Le Yuan 100, Beijing 100124, Peoples R China

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来源 :

JOURNAL OF SOLID STATE CHEMISTRY

ISSN: 0022-4596

年份: 2020

卷: 283

3 . 3 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:139

被引次数:

WoS核心集被引频次: 12

SCOPUS被引频次: 13

ESI高被引论文在榜: 0 展开所有

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