Judd-Ofelt analysis of Ho3+ doped in ceramic CaSc2O4

被引:18
作者
Georgescu, Serban [1 ]
Stefan, Angela [1 ,2 ]
Toma, Octavian [1 ]
Voiculescu, Ana-Maria [1 ]
机构
[1] Natl Inst Laser Plasma & Radiat Phys, Magurele Ilfov 077125, Romania
[2] Univ Bucharest, Fac Phys, Magurele Ilfov 077125, Romania
关键词
CaSc2O4; Judd-Ofelt; Ho3+; RARE-EARTH IONS; OPTICAL-ABSORPTION INTENSITIES; ENERGY-TRANSFER; UP-CONVERSION; SPECTROSCOPIC PROPERTIES; FLUORIDE GLASSES; CALCIUM SCANDATE; SINGLE-CRYSTALS; LUMINESCENCE; PROBABILITIES;
D O I
10.1016/j.jlumin.2015.02.040
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A Judd-Ofelt analysis was performed on a calcium scandate (CaSc2O4) ceramic sample doped with 2 at% Ho3+. Using the measured lifetime of I-5(7) level to calibrate the absorption spectrum, the Judd-Ofelt parameters were obtained: Omega(2) = 3.78 x 10(-20) cm(2), Omega(4) = 5.17 x 10(-20) cm(2), and Omega(6) = 1.92 x 10(-20) cm(2). The electric-dipole and magnetic-dipole transition probabilities, radiative lifetimes and luminescence branching ratios were calculated. The quantum efficiency of the green emitting levels (F-5(4), S-5(2)) was found: 54%. The calibration method also allowed the estimation of the 'effective' thickness of the ceramic sample: approximately eight times greater than the geometric thickness. (C) 2015 Elsevier B.V. All rights reserved.
引用
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页码:174 / 179
页数:6
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