A phosphor-in-glass (P-i-G) exhibiting orange-red emission, composed of Sm 3+ ion-doped CaAl 4 O 7 , was synthesized utilizing a multicomponent tellurite glass system via melting quenching technique. Absence of sharp Bragg peaks indicates the amorphous nature of the fabricated P-i-G. Fourier transform infrared spectroscopy (FTIR) and Raman studies, confirmed the existence of characteristic vibrational modes corresponding to the B-O and Te–O bonds. Through the optical microscopy and scanning electron microscope (SEM), the presence of phosphor material was observed inside the glass matrix. Strong emission bands of Sm 3+ ions were identified from the P-i-G sample using the photoluminescence (PL) measurement. The P-i-G demonstrates significant thermal and power stabilities, maintaining 65.5% of its initial intensity at 150 °C, displaying consistent emission across a broad UV LED input power range of 0.25–10 W.
Hegde et al. (Sat,) studied this question.