[14a-411-1~10] 13.9 Optical properties and light-emitting devices

[14a-411-1] Thermal quenching analyses of Eu²⁺-activated Sr-containing sialon phosphors using the thermally activated cross-over model.

〇Yumi Fukuda¹ (1.Toshiba R&D Center)

Keywords:phosphor, sialon, thermal quenching

To investigate the relation between the luminescence properties and the crystal structure, the thermal quenching of three kinds of Eu²⁺-activated Sr-containing sialon phosphors are analyzed using the Struck-Fonger model. The Franck-Condon offset and the inherent frequency of the host lattice are calculated from the measured internal quantum efficiency at various temperatures, and the results confirm that the inherent frequency of the host lattice dominates the thermal quenching of these phosphors. Moreover, clarification of the relationship between these parameters and the host crystal structure reveals that the covalence and density of the host crystal structure mainly influence the inherent frequency and therefore influence the extent of the thermal quenching.