Host-Sensitized Luminescence of KI:Tl under an Applied Electric Field

概要

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Effect of an electric field on the host-sensitized luminescence of Kl:Tl is studied at room temperature. Contribution of free carriers to the mechanism of the host sensitization is estimated form an abrupt reduction in the intensity of Tl^+ emission which is induced by an application of a dc electric field. Under optical excitation in the interband absorption region, absorbed energy is transferred from the host KI to a Tl^+ center by free carriers. On the contrary, the contribution of free carriers to the process of the energy transfer is small in the case of excitation in the exciton band. A small fraction of excitons seems to decompose through exciton-exciton collision. It is suggested that the Tl^+ emission stimulated in the region of exciton absorption band is caused not only by direct excitation of D state but also due to the energy transfer by excitons.
社団法人日本物理学会の論文
1972-10-05