Up-conversion photoluminescence and thermoluminescence studies of Er³⁺ doped Y₂O₃ phosphors

Abstract

This paper reports the preparation of yttrium oxide (Y₂O₃) doped with various concentrations of Er³⁺ using high temperature synthesis method. Photoluminescence (PL) emission spectra of the samples were recorded at an excitation of 980 nm laser source. Two prominent peaks centered at 484 nm and 574 nm were found and attributed to the ²P_3/2→⁴I_11/2 and ⁴S_3/2→⁴I_15/2, respectively. The sample with 2.5 mol% of Er³⁺ provided the optimum intensity in emission spectra. The sample with optimum PL emission was investigated for its thermoluminescence (TL) glow curve exhibited the second order kinetics. The peak TL intensity was found around 236 °C, i.e., towards high temperature which supports the fact of formation of deeper traps. Therefore, the material taken may be regarded as a good candidate for light emitting diode (LED) applications.

Keywords

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