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政大典藏 > College of Science > Graduate Institute of Applied Physics > Periodical Articles > Item 140.119/63529

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Title:	Versatile Phosphate Phosphors ABPO4 in White Light-Emitting Diodes: Collocated Characteristic Analysis and Theoretical Calculations
Authors:	郭光宇 Guo, Guang-Yu
Contributors:	應物所
Date:	2010.02
Issue Date:	2014-01-24 12:22:38 (UTC+8)
Abstract:	The orthophosphate host family, A`B"P04 (A` = monovalent cation, B" = 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 diftraction (XRD) and GSAS refinement. The versatility of the phosphor host A`B"PO4 is established by examining isovalent substitutions of four cations in the structure-Li or K for A`, Sr or Ba for B"-and three doped activators, RE = Eu2+, Tb3+ and Sm3+. The luminescence properties, decay time, and Commission Internationale de l`Eclairage (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.
Relation:	Journal of American Chemical Society, 132(9), 3020-3028
Data Type:	article
DOI link:	http://dx.doi.org/10.1021/ja9092456
DOI:	10.1021/ja9092456
Appears in Collections:	[Graduate Institute of Applied Physics] Periodical Articles

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