Elucidation of Luminescence Mechanism of a Perovskite-type Oxide Phosphor with the Aid of a Monolayer-Forming Technique

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We tried to elucidate the luminescence mechanism of a representative perovskite oxide phosphor of PCSTO with the aid of a monolayer-forming technique. The experiments revealed that both the UV and carrier-injection excitations create the same excited state of Pr, that both excitations need ca. 4 eV, and that in the carrier-injection case the recombination with the carriers(carrying opposite charges) trapped at the PCSTO/electrode interface is crucial. Consequently, it is supposed that not the transport of the excitons themselves, but the energy transfer from them excites Pr.