Doping Sm3+ into ZnB2O4 phosphors and their structural and cathodoluminescence properties

WOS: 000429838900032
In this study, ZnB2O4:xSm(3+) (0.01 H-6(7/2) located at 606 nm can occur as hypersensitive transition having the selection rule Delta J = +/- 1. The observed peaks are in the region of yellow reddish light of Sm3+. Experimental results verify that the optimum Sm3+ content in terms of intense luminescence for this series of phosphors was 2%. Beyond 2% of Sm3+ ions concentration, luminescence quenching occurs due to an enhanced probability of the energy transfer from one Sm3+ to another that matches in energy via cross-relaxation and dipole-dipole interactions according to Dexter theory. A suitable energy transfer model between two adjacent Sm3+ ions in the ZnB2O4 phosphors was accomplished by the electric dipole-dipole interaction. The critical transfer distance (R-c) for non-radiative energy transfer was found to be 21.52 angstrom at 2 mol % Sm3+ doped ZnB2O4. Additionally, thermoluminescence (TL) glow curves of undoped and Sm activated ZnB2O4 under beta irradiation of 10 Gy are also discussed here. (C) 2018 Elsevier B.V. All rights reserved.
Commission of Scientific Research Projects of Uludag University [OUAP(F)-2015/31]; Cukurova University, Turkey [FAY-2015-4735, FDK-2017-7905]
This work was supported by the Commission of Scientific Research Projects of Uludag University, Project number OUAP(F)-2015/31 and the Research Fund of the Cukurova University, Turkey (Project Number: FAY-2015-4735 and FDK-2017-7905).