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A new Pr 3+ ‐activated molybdate‐based phosphor for application to white LEDs with blue excitation
Author(s) -
Li Qiuxia,
Huang Jiaping,
Chen Donghua
Publication year - 2010
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.1236
Subject(s) - phosphor , photoluminescence , molybdate , analytical chemistry (journal) , light emitting diode , materials science , transmission electron microscopy , luminescence , doping , powder diffraction , photoluminescence excitation , chemistry , crystallography , optoelectronics , nanotechnology , chromatography , metallurgy
ABSTRACT The novel red‐emitting phosphors K x Sr 1−2 x MoO 4 :Pr 3+ x (0.00 ≤ x ≤ 0.04) were prepared by solid‐state reaction. The crystallization and particle sizes of samples were investigated by powder X‐ray diffraction (XRD) and transmission electron microscopy (TEM). TEM images were in good agreement with the theoretical calculation data from the XRD patterns. Photoluminescence analysis indicated that there were three excitation peaks under 430–500 nm, and all samples showed the intensely red emission at 648 nm corresponding to the 3 P 0 → 3 F 2 transition of Pr 3+ . The concentrations of doping ions, temperature and polyethylene glycol in the phosphor system can significantly influence the intensity of the red emission. The photoluminescence spectral intensity reached its maximum at x = 0.02. The results showed that the investigated phosphor is a potential red phosphor for white light‐emitting diodes. Copyright © 2010 John Wiley & Sons, Ltd.