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Photoluminescence of Dy 3+ activator sensitized by Ce 3+ in KNaSO 4 microphosphor
Author(s) -
Manik Urvashi,
Gedam S. C.,
Dhoble S. J.
Publication year - 2015
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.2814
Subject(s) - photoluminescence , scanning electron microscope , luminescence , activator (genetics) , materials science , ion , analytical chemistry (journal) , particle size , doping , photoluminescence excitation , phosphor , chemistry , optoelectronics , composite material , chromatography , gene , biochemistry , organic chemistry
The KNaSO 4 microphosphor doped with Ce or Ce and Dy prepared by a wet chemical method was studied by scanning electron microscopy (SEM) and characterized by photoluminescence (PL). KNaSO 4 has a 5‐µm particle size detected by SEM. The KNaSO 4 :Ce 3+ spectrum shows a single emission band at 327 nm for an excitation of 269 nm due to 5d → 4f transition of the Ce 3+ ion, indicating weak spin orbiting coupling of the Ce 3+ ground state. Efficient energy transfer takes place from Ce 3+ → Dy 3+ sublattices indicating that Ce 3+ could effectively sensitize Dy 3+ (orange emission) and that the Ce 3+ emission weakens significantly in KNaSO 4 . The powder form of prepared KNaSO 4 show negligible change in morphologies and hence no effect on the particle size. The characteristics of this powder could provide improved luminescence properties. The development and understanding of this photoluminescence and the effect of Dy 3+ on KNaSO 4 : Ce 3+ are discussed. Copyright © 2014 John Wiley & Sons, Ltd.