ESR and TSL study of hole and electron traps in LuAG:Ce,Mg ceramic scintillator

0455257 - FZÚ 2016 RIV NL eng J - Článek v odborném periodiku
Hu, C. - Liu, S.-P. - Fasoli, M. - Vedda, A. - Nikl, Martin - Feng, X. Q. - Pan, Y.B.
ESR and TSL study of hole and electron traps in LuAG:Ce,Mg ceramic scintillator.
Optical Materials. Roč. 45, Jul (2015), s. 252-257. ISSN 0925-3467. E-ISSN 1873-1252
Grant CEP: GA ČR GAP204/12/0805
Institucionální podpora: RVO:68378271
Klíčová slova: LuAG * scintillator * codoping * Ce3+ * O- center
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.183, rok: 2015

The process of hole and electron localization in LuAG:Ce,Mg ceramics is studied by electron spin resonance (ESR) and thermally stimulated luminescence (TSL). Hole traps, which are created by UV irradiation, are detected in the form of O- centers. Mg-perturbed variants of O- centers are proposed to exist. The thermal stability of such defects is studied, proving that they are stable up to room temperature. The interaction between O- centers and shallow electron traps is studied by thermally stimulated luminescence (TSL) and phosphorescence experiments, which reveal the occurrence of an a-thermal tunneling process between trapped electrons and randomly distributed Ce centers. By correlating the TSL-derived trap parameters and temperature dependent ESR intensities, it is found that O- centers compete with Ce centers in free electron capture.
Trvalý link: http://hdl.handle.net/11104/0255888