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Structure and photoluminescent properties of green‐emitting terbium‐doped GdV 1− x P x O 4 phosphor prepared by solution combustion method
Author(s) -
Motloung S. J.,
Shaat S. K. K.,
Tshabalala K. G.,
Ntwaeaborwa O. M.
Publication year - 2016
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.3073
Subject(s) - terbium , photoluminescence , analytical chemistry (journal) , phosphor , materials science , spectroscopy , doping , fourier transform infrared spectroscopy , gadolinium , scanning electron microscope , powder diffraction , x ray photoelectron spectroscopy , luminescence , nuclear chemistry , chemistry , nuclear magnetic resonance , crystallography , optics , optoelectronics , physics , chromatography , quantum mechanics , metallurgy , composite material
Terbium‐doped gadolinium orthovanadate (GdVO 4 :Tb 3+ ), orthophosphate monohydrate (GdPO 4 ·H 2 O:Tb 3+ ) and orthovanadate–phosphate (GdV,PO 4 :Tb 3+ ) powder phosphors were synthesized using a solution combustion method. X‐Ray diffraction analysis confirmed the formation of crystalline GdVO 4 , GdPO 4 ·H 2 O and GdV,PO 4 . Scanning electron microscopy images showed that the powder was composed of an agglomeration of particles of different shapes, ranging from spherical to oval to wire‐like structures. The chemical elements present were confirmed by energy dispersive spectroscopy, and the stretching mode frequencies were determined by Fourier transform infrared spectroscopy. UV–visible spectroscopy spectra showed a strong absorption band with a maximum at 200 nm assigned to the absorption of VO 4 3− and minor excitation bands assigned to f → f transitions of Tb 3+ . Four characteristic emission peaks were observed at 491, 546, 588 and 623 nm, and are attributed to 5 D 4 → 7 F j ( j = 6, 5, 4 and 3). The photoluminescent prominent green emission peak ( 5 D 4 → 7 F 5 ) was centred at 546 nm. The structure and possible mechanism of light emission from GdV 1− x P x O 4 :% Tb 3+ are discussed. Copyright © 2016 John Wiley & Sons, Ltd.