• RAUNAK KUMAR TAMRAKAR

Articles written in Bulletin of Materials Science

• Synthesis, structural and luminescence properties of Dy$^{3+}$ activated GdAlO$_3$ phosphors by a solid state reaction method under a N$_2$ atmosphere

Dysprosium (Dy$^{3+}$) ion-doped GdAlO$_3$ nanophosphors were fabricated by using a high temperature solid state reaction method. X-ray diffraction measurements were used to investigate the phase and crystal size of these phosphors. The morphology of the powder was observed by scanning electron microscopy. The band structure of the phosphor was determined by recording the UV absorption spectra and Tauc plot. The optical behaviour of the phosphors was determined by measuring their photoluminescence (PL) spectra. The PL spectra show characteristic blue (489 nm) and green (567 nm)emissions corresponding to the energy level transitions of Dy$^{3+}$.

• Investigation of a thermoluminescence response and trapping parameters and theoretical model to explain concentration quenching for Yb³⁺-doped ZrO₂ phosphors under UV exposure

In this paper, a thermoluminescence signal centred at 129°C induced by UV radiation of Yb3+-doped ZrO2 is reported. Phosphor was prepared by a solution combustion method and annealed at 600 and 900°C to study the effect of annealing. The prepared phosphor was characterized by X-ray diffraction and scanning electron microscopy methods. Various parameters were optimized. Computerized glow curve deconvolution was employed and kinetic parameters for every deconvoluted peak were calculated. To understand the concentration quenching, a 3T1R (three trap one recombination centre) model has been proposed.

• # Bulletin of Materials Science

Volume 43, 2020
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