Versatile phosphate phosphors ABPO4 in white light-emitting diodes: Collocated characteristic analysis and theoretical calculations

Chun Che Lin, Zhi Ren Xiao, Guang Yu Guo, Ting Shan Chan, Ru Shi Liu

研究成果: 雜誌貢獻文章同行評審

320 引文 斯高帕斯(Scopus)

摘要

The orthophosphate host family, AIBIIPO4 (AI = monovalent cation, BII = divalent cation), has recently been made available as phosphors that combine with near-UV lighting chips for use In solid-state white light-emitting diodes (LEDs). This study elucidates the crystalline structure and lattice parameters of the products via a solid-state reaction, using powder X-ray diffraction (XRD) and GSAS refinement. The versatility of the phosphor host AIB IIPO4 Is established by examining isovalent substitutions of four cations In the structure-Li or K for AI, Sr or Ba for B II-and three doped activators, RE = Eu2+, Tb3+, and Sm3+. The luminescence properties, decay time, and Commission Internationale de l'Éclairage (CIE) chromaticity index are determined for various concentrations of these activators and metal constituents of the host. The thermal stabilities of all of these compounds are determined for the first time from the crystal structure and the coordination environment of the rare-earth metal. The morphology, composition, and particle size were measured In detail. Finally, density functional calculations were performed using the generalized gradient approximation plus an on-site Coulombic interaction correction (GGA+U) scheme to investigate the electronic structures of the KSrPO4 system. A concise model was proposed to explain the luminescence mechanism.
原文英語
頁(從 - 到)3020-3028
頁數9
期刊Journal of the American Chemical Society
132
發行號9
DOIs
出版狀態已發佈 - 三月 10 2010
對外發佈

ASJC Scopus subject areas

  • 催化
  • 化學 (全部)
  • 生物化學
  • 膠體和表面化學

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