Dynamics of radio-photoluminescence and thermally-stimulated luminescence in KBr:Sm

作者：Okada Go^*; Fujimoto Yutaka; Tanaka Hironori; Kasap Safa; Yanagida Takayuki

来源：Journal of Materials Science: Materials in Electronics , 2017, 28(21): 15980-15986.

DOI：10.1007/s10854-017-7496-z

Sm-doped KBr single crystals were prepared by the Bridgman-Stockbarger technique. The samples show both radio-photoluminescence (RPL) and thermally-stimulated luminescence (TSL). The RPL is due to the valence change of the Sm ion (Sm3+ -> Sm2+), induced by X-rays, so the photoluminescence emission by Sm2+ appears as a result of irradiation and the intensity increases with the irradiation dose. The emission of Sm2+ is due to the 5d-4f transitions. The RPL response seems to be related with the thermally-stimulated luminescence (TSL) on the same samples. The TSL emission is predominantly due to Sm2+, instead of Sm3+, indicating that capture of a hole by Sm2+ takes place. As a result of TSL (or heat treatment), Sm2+ reverts to Sm3+ as the original state. The thermal activation energies have been derived from TSL isothermal analyses, and the obtained values are 1.42, 1.55, 1.65, and 1.74 eV.

• 出版日期2017-11
• 单位Saskatoon; Saskatchewan