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Luminescence and Thermal-Quenching Properties of Red-Emitting Ca2Al2SiO7:Sm3+ Phosphors
Luminescence and Thermal-Quenching Properties of Red-Emitting Ca2Al2SiO7:Sm3+ Phosphors
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Date
2020
Authors
Nguyen Manh Son
Do Thanh Tien
Nguyen Thi Quynh Lien
Vu Xuan Quang
Nguyen Ngoc Trac
Tran Thi Hong
Ho Van Tuyen
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Abstract
Ca2Al2SiO7:x.Sm3+ (x = 0.5, 1.0, 1.5, 2.0, 2.5, and 3.5 mol.%) (CAS:x.Sm3+)
phosphors were synthesized by a solid-state reaction technique. The structure,
photoluminescence properties and thermal stability of phosphors were
investigated in detail. Results of X-ray diffraction show that CAS:x.Sm3+
materials have a single-phased tetragonal structure, and an expansion of the
unit cell relates to the increasing of Sm3+ concentration. Photoluminescence
study displayed that the CAS:x.Sm3+ phosphors reach the highest emission
intensity at 1.5 mol.% Sm3+ and achieved the luminescence quenching phenomenon
a higher concentration. The dominant interaction mechanism of the
concentration quenching process is determined due to the dipole–dipole
interaction, and the critical transfer distance (Rc) is 26.7 A ° . The temperature
dependence of photoluminescence spectra indicates that the Ca2Al2SiO7:Sm3+
(1.5 mol.%) phosphor possess good thermal stability, and that the activation
energy is around 0.12 eV (968 cm 1). Several characteristic vibrations in the
200–1000-cm 1 region were observed by Raman spectra, and the color chromaticity
coordinates of the samples were also calculated and discussed.
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Keywords
"Ca2Al2SiO7,
samarium,
luminescent materials,
concentration quenching"