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Eu 3+ ‐activated Y 2 MoO 6 : a narrow band red‐emitting phosphor with strong near‐UV absorption
Author(s) -
He Xianghong,
Bian Danping,
Wang Hao,
Xu Jian
Publication year - 2012
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2448
Subject(s) - phosphor , chromaticity , photoluminescence , analytical chemistry (journal) , light emitting diode , absorption (acoustics) , excited state , doping , emission spectrum , absorption band , materials science , absorption spectroscopy , luminescence , fluorescence , chemistry , optoelectronics , spectral line , optics , atomic physics , physics , chromatography , astronomy , composite material
Near‐UV excited narrow line red‐emitting phosphors, Eu 3+ ‐activated Y 2 MoO 6 systems, were synthesized using a simple molten salt reaction. The structure and photoluminescence characteristics were investigated using X‐ray powder diffraction, UV–Vis absorption and fluorescent spectrophotometry. The excitation spectra show strong broad‐band absorptions in the near‐UV to blue light regions which match the radiation of near‐UV light‐emitting diode chips well. Under excitation of either near‐UV or blue light, intense red emission with a main peak of 611 nm is observed, ascribed to the 5 D 0 – 7 F 2 transition of Eu 3+ ions; the optimal doping concentration is 20 mol%. The chromaticity coordinates ( x = 0.65, y = 0.34) of the as‐obtained phosphor are very close to the National Television Standard Committee standard values ( x = 0.67, y = 0.33). All these characteristics suggest that this material is a promising red‐emitting phosphor candidate for white‐LEDs based on near‐UV LED chips. Copyright © 2012 John Wiley & Sons, Ltd.