Structural and Spectroscopic Studies of ${\rm \Pr}^{3+}$ -Doped ${\rm GdAlO}_{3}$

In this work, GdAlO₃:Pr³⁺ was successfully prepared by the Pechini method at lower temperatures when compared to others methods such as solid-state synthesis and sol-gel process. In accordance to the XRD data, the fully crystalline single-phase GdAlO₃ could be obtained at 900 °C. Luminescence measurements indicate Gd → Pr³⁺ energy transfer. In the emission spectra, the ³P₀ →³ H₄ (blue emission) and ¹D₂ →³ H₄ (red emission) transitions of Pr³⁺ ions can be observed and the ratio between their intensities depends on the Pr³⁺ content due to the cross-relaxation phenomenon.