Mudassir alam

Abdul Wali Khan University Mardan, Pakistan

Gamma Irradiation Effects on the Physical, Optical, and Energy Transfer Luminescence Properties of Gadolinium Modified, Europium Doped Phosphate Glass

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Biography

Mudassir Alam holds a BS degree in Physics from Abdul Wali Khan University Mardan, Pakistan. His research interests include Applied Physics, Materials Science, Renewable Energy, Optoelectronics, Photonics, and Nanomaterials.

During his undergraduate studies, he researched the optical and luminescence properties of gamma-irradiated rare-earth-doped phosphate glasses and gained experience in UV-Visible spectroscopy, FTIR, and luminescence analysis. He also has teaching experience in Physics at the college level.

In 2024, he secured 1st position in a poster presentation at an International Conference on Food and Applied Sciences. He is interested in presenting his research at the conference and engaging with researchers and professionals in optics, photonics, and advanced materials.

Abstract

Lithium aluminum calcium gadolinium europium phosphate glasses, known as LACGEP, containing 6 and 8 mol% gadolinium were prepared and exposed to gamma radiation at doses up to 10 kGy. The effects of irradiation on their density, refractive index, optical absorption, optical band gap, excitation spectra, and emission spectra were investigated. Gamma irradiation produced substantial changes in the optical properties of both compositions. The optical band gap decreased from 3.39 to 1.76 eV for the 6 mol% Gd sample and from 3.53 to 1.72 eV for the 8 mol% Gd sample, indicating radiation induced modifications of the glass network and electronic states. The refractive index increased from 2.879 to 3.028 and from 2.984 to 3.169 for the 6 and 8 mol% Gd samples, respectively. Radiation also altered the characteristic luminescence bands of Gd³? and Eu³?, consistent with energy transfer from Gd³? to Eu³?. Although most excitation and emission bands decreased in intensity after irradiation, the hypersensitive Gd³? excitation and emission bands near 275 and 312 nm, respectively, showed enhancement. These radiation induced changes demonstrate the potential of LACGEP glasses for upper atmosphere investigations, gamma ray dosimetry, and nuclear waste monitoring.