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Luminescence and Quantum Efficiencies of Eu 3+ ‐Doped Vanadate Garnets
Author(s) -
Xie Hongde,
Tsuboi Taiju,
Huang Wei,
Huang Yanlin,
Qin Lin,
Seo Hyo Jin
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12771
Subject(s) - vanadate , luminescence , doping , photoluminescence , materials science , quantum efficiency , analytical chemistry (journal) , excitation , ion , europium , crystal structure , photoluminescence excitation , crystallography , chemistry , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , metallurgy
Nondoped and 5.0 mol% Eu 3+ ‐doped vanadate garnets Ca 5 Mg 4 ( VO 4 ) 6 , NaCa 2 Mg 2 [ VO 4 ] 3 , KCa 2 Mg 2 [ VO 4 ] 3 , and NaSr 2 Mg 2 [ VO 4 ] 3 were synthesized by solid‐state reactions. The formation of single‐phase compound with garnet structure is confirmed by X‐ray diffraction. The photoluminescence ( PL ) and PL excitation ( PLE ) spectra are investigated together with color coordinates. The luminescence process is discussed on the charge‐transfer transitions in [ VO 4 ] 3− ions and the crystal structure. The PL quantum efficiencies ( QE ) are measured for nondoped and Eu 3+ ‐doped samples. The Eu 3+ ‐doped samples have higher QE s than the corresponding nondoped ones although the energy transfer occurs from [ VO 4 ] 3− to Eu 3+ . Broad emission band due to [ VO 4 ] 3− with intense sharp lines due to Eu 3+ , which gives white color, is observed in Eu 3+ ‐doped NaCa 2 Mg 2 [ VO 4 ] 3 and NaSr 2 Mg 2 [ VO 4 ] 3 under excitation with UV light. These materials are suggested to be useful for lighting under the excitation with near‐ UV LED .