Temperature dependence of luminescence properties of praseodymium-doped perovskite CaTiO₃:Pr³⁺
2012
Inaguma, Yoshiyuki | Tsuchiya, Takeshi | Mori, Yuki | Imade, Yuki | Sato, Nobuhisa | Katsumata, Tetsuhiro | Mori, Daisuke
A polycrystalline perovskite CaTiO₃:Pr³⁺ was synthesized and the temperature dependence of luminescence properties was investigated in the temperature range of 6–440K. CaTiO₃:Pr³⁺ exhibits red emission ascribed to the f–f transition from the excited state ¹D₂ to the ground state ³H₄ of Pr³⁺ upon the band gap photo-excitation between valence and conduction band, and upon the IVCT (inter valence charge transfer between Pr³⁺ and Ti⁴⁺) photo-excitation. Below 330K, the emission intensity upon the band gap excitation increased with temperature, while the temperature dependence of emission intensity upon the IVCT excitation is relatively small, indicating that the electron transfer process between Pr³⁺ and the host accompanied by the band gap excitation is thermally activated. Above 330K, the thermal quenching of emission was observed upon both of the band gap and the IVCT excitation and the energy barrier for thermal quenching was estimated to be ∼5500cm⁻¹.
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