TY - JOUR
T1 - Combustion synthesis and characterization of MV0.5P0.5O4
T2 - Sm3+ Tm3+ (M = Gd, La, Y)
AU - Motloung, Selepe J.
AU - Lephoto, Mantwa A.
AU - Tshabalala, Kamohelo G.
AU - Ntwaeaborwa, Odireleng M.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/4/15
Y1 - 2018/4/15
N2 - In this paper, GdV0.5P0.5O4: Sm3+, Tm3+, LaV0.5P0.5O4: Sm3+, Tm3+ and YV0.5P0.5O4: Sm3+, Tm3+ phosphor powders were prepared by solution combustion method using urea as a fuel. The phase purity, surface morphology, optical and photoluminescence properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectroscopy and photoluminescence spectroscopy. The XRD results indicated that the prepared powders are of a single phase and crystallized in tetragonal structure for Gd and Y systems while monoclinic phase was observed for La system. SEM showed that the samples consisted of mixed structures. The estimated band gaps were 2.2, 2.4 and 2.3 eV for Y, Gd and La systems respectively. The photoluminescence results showed four emission peaks. One peak is assigned to 1G4 — 3H6 transition of Tm3+, and three other emission peaks are attributed to 6G5/2 — 6H5/2, 6G5/2 — 6H7/2 and 6G5/2 — 6H9/2 transitions of Sm3+. The photoluminescent intensity was the highest in the gadolinium system.
AB - In this paper, GdV0.5P0.5O4: Sm3+, Tm3+, LaV0.5P0.5O4: Sm3+, Tm3+ and YV0.5P0.5O4: Sm3+, Tm3+ phosphor powders were prepared by solution combustion method using urea as a fuel. The phase purity, surface morphology, optical and photoluminescence properties were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis spectroscopy and photoluminescence spectroscopy. The XRD results indicated that the prepared powders are of a single phase and crystallized in tetragonal structure for Gd and Y systems while monoclinic phase was observed for La system. SEM showed that the samples consisted of mixed structures. The estimated band gaps were 2.2, 2.4 and 2.3 eV for Y, Gd and La systems respectively. The photoluminescence results showed four emission peaks. One peak is assigned to 1G4 — 3H6 transition of Tm3+, and three other emission peaks are attributed to 6G5/2 — 6H5/2, 6G5/2 — 6H7/2 and 6G5/2 — 6H9/2 transitions of Sm3+. The photoluminescent intensity was the highest in the gadolinium system.
KW - Combustion synthesis
KW - Oxyorthovanadates
KW - Phosphors
KW - Photoluminescence
UR - http://www.scopus.com/inward/record.url?scp=85026458438&partnerID=8YFLogxK
U2 - 10.1016/j.physb.2017.07.038
DO - 10.1016/j.physb.2017.07.038
M3 - Article
AN - SCOPUS:85026458438
SN - 0921-4526
VL - 535
SP - 211
EP - 215
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
ER -