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Impact of Tb 3+ ion concentration on the morphology, structure and photoluminescence of Gd 2 O 2 SO 4 :Tb 3+ phosphor obtained using thermal decomposition of sulfate hydrate
Author(s) -
Rodrigues R.V.,
Marciniak Ł.,
Khan L.U.,
Muri E.J.B.,
Cruz P.C.M.,
Matos J.R.,
Strȩk W.,
Marins A.A.L.
Publication year - 2020
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.3886
Subject(s) - terbium , photoluminescence , phosphor , analytical chemistry (journal) , dopant , thermogravimetric analysis , materials science , gadolinium , ion , doping , nuclear chemistry , chemistry , luminescence , optoelectronics , organic chemistry , chromatography , metallurgy
Gadolinium oxysulfate doped with terbium (Gd 2 O 2 SO 4 :Tb 3+ ; 0.1, 1.0, and 10.0 mol%) materials were obtained using thermal decomposition from sulfate hydrate under a dynamic air atmosphere and between 1320–1400 K. The materials were characterized using Fourier transform infrared spectroscopy, thermogravimetric/derivative thermogravimetric investigations and X‐ray powder diffraction patterns. The Tb 2 O 2 SO 4 compound was obtained at 1300 K and was used to compare thermal stability and photoluminescence behaviour with that of Gd 2 O 2 SO 4 :Tb 3+ (0.1, 1.0, and 10.0 mol%). Magnetic susceptibility measurements indicated the presence of 15% Tb 4+ phases within Tb 2 O 2 SO 4 . The materials were excited at 377 nm and displayed green narrow lines with the strongest emission peak at 545.5 nm due to the 5 D 4 → 7 F 5 transition of Tb 3+ ions. Brightness of terbium‐activated gadolinium oxysulfate phosphors was enhanced with increase in the concentration of Tb 3+ . Detailed analysis of spectroscopic properties of materials under investigations revealed efficient Gd 2 O 2 SO 4 to Tb 3+ and Tb 3+ to Tb 3+ energy transfers. Increase in dopant concentration led to the enhancement of 5 D 4 → 7 F J emission intensity and reduction of 5 D 3 → 7 F J emission intensity via cross‐relaxation mechanisms. Distribution of particle size was increased by controlling dopant concentration in the host lattice. Obtained results confirmed that these materials could be applied potentially in field emission display devices and light‐emitting diodes.