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Title: Development of Eu{sup 3+} activated monoclinic, perovskite, and garnet compounds in the Gd{sub 2}O{sub 3}–Al{sub 2}O{sub 3} phase diagram as efficient red-emitting phosphors

Eu{sup 3+} doped Gd{sub 4}Al{sub 2}O{sub 9} (GdAM), GdAlO{sub 3} (GdAP), and Gd{sub 3}Al{sub 5}O{sub 12} (GdAG, containing 10 at% of Lu{sup 3+} for lattice stabilization) have been developed in this work as efficient red-emitting phosphors. With coprecipitated carbonate precursors, phase evolution studies found minimum processing temperatures of ∼1000, 1100, and 1300 °C for the three phosphors to crystallize as pure phases, respectively. Compared with their yttrium aluminate counterparts, the gadolinium-based phosphors exhibit red-shifted O{sup 2−}–Eu{sup 3+} charge transfer excitation band (CTB) centers due to the lower electronegativity of Gd{sup 3+} and appreciably higher quantum yields of photoluminescence owing to the occurrence of efficient Gd{sup 3+}→Eu{sup 3+}energy transfer. The optimal Eu{sup 3+} contents were determined to be ∼7.5 at% for GdAM and 5.0 at% for both GdAP and GdAG, and concentration quenching of luminescence was suggested to be due to exchange interactions. Fluorescence decay analysis found a shorter lifetime for the phosphor powder processed at a higher temperature or with a higher Eu{sup 3+} content, and the underlying mechanism was discussed. Fluorescence lifetimes were also compared between the yttrium and gadolinium phosphor systems for the dominant emissions. - Graphical abstract: Eu{sup 3+} doped Gd{sub 4}Al{sub 2}O{sub 9} (GdAM), GdAlO{sub 3}more » (GdAP), and Gd{sub 3}Al{sub 5}O{sub 12} (GdAG, containing 10 at% of Lu{sup 3+} for lattice stabilization) have been developed as efficient red-emitting phosphors. Owing to the Gd{sup 3+} to Eu{sup 3+} energy transfer, improved luminescence is observed for the compounds than their yttrium-based counterparts. Display Omitted - Highlights: • Eu{sup 3+} doped Gd{sub 4}Al{sub 2}O{sub 9}, GdAlO{sub 3} and (Gd{sub 0.9}Lu{sub 0.1}){sub 3}Al{sub 5}O{sub 12} developed as red phosphors. • Improved red-emissions than their yttrium-based counterparts confirmed. • Efficient Gd{sup 3+}→Eu{sup 3+}energy transfer observed. • Applications in various lighting, display, and scintillation areas expected.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ; ; ;  [1] ;  [3]
  1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials and Metallurgy, Northeastern University, Shenyang, Liaoning 110004 (China)
  2. (Japan)
  3. Advanced Materials Processing Unit, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047 (Japan)
Publication Date:
OSTI Identifier:
22274111
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 206; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINATES; CARBONATES; DOPED MATERIALS; ELECTRONEGATIVITY; ENERGY TRANSFER; EUROPIUM IONS; EXCHANGE INTERACTIONS; FLUORESCENCE; GADOLINIUM; GADOLINIUM IONS; GARNETS; LUTETIUM IONS; MONOCLINIC LATTICES; PEROVSKITE; PHOSPHORS; PHOTOLUMINESCENCE; POWDERS; QUENCHING; SCINTILLATIONS; YTTRIUM