Optical tuning and dual luminescence behavior of MgGa2O4:Dy3+for optoelectronic and dosimetric applications

Jyothi, T. P. and Kartik, G. and Sunitha, D. V. and Kavyashree, D. and Gnana Prakash, A. P. (2025) Optical tuning and dual luminescence behavior of MgGa2O4:Dy3+for optoelectronic and dosimetric applications. Ceramics International, 51 (26). ISSN 02728842

Text v2.pdf Download (9MB)

Abstract

The present study reports the synthesis, structural, morphological, and luminescence properties of Dy3+doped MgGa2O4nanoparticles prepared by solution combustion method. The PXRD spectra confirmed the pure and highly crystalline cubic spinel structure MgGa2O4:Dy3+nanoparticles. FTIR results inferred the characteristic metal-oxygen bonds of Mg-O and Ga-O. SEM and TEM micrographs demonstrated the compact and uniformly distributed particles of ∼30 nm in size for Dy3+doped MgGa2O4nanoparticles. The optical bandgap, was found to be ∼4.90 eV for pure sample whereas, with increasing Dy3+dopant ion concentration the bangap increased up to 4.99 eV. Photoluminescence (PL) spectra revealed the characteristic Dy3+emissions at 482, 577, and 665 nm, with a dominant yellow emission at 577 nm, making the material suitable for optoelectronic applications. The decay lifetime significantly increased from 121.26 μs (pure) to 399.17 μs (9 mol% Dy3+), indicating efficient luminescence persistence due to improved energy transfer and reduced non-radiative recombination. And quantum efficiency of 51.23 % was observed in 9 mol% Dy3+doped MgGa2O4samples. The color chromaticity values exhibits that these materials have high potential for warm white LEDs applications.Further, TL properties carried out for 500 Gy gamma irradiated MgGa2O4:Dy3+(7 mol%) shows a prominent peak at 201 °C. The detailed kinetic parameter analysis confirmed second-order TL behavior with an activation energy of 0.89 eV, indicating its suitability for medium-dose radiation dosimetry. The research findings of Dy3+doped MgGa2O4acts as a promising phosphor for advanced photonic technologies and radiation dosimetry applications. © 2025 Elsevier Ltd and Techna Group S.r.l. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

Item Type:	Article
Uncontrolled Keywords:	Bandgap engineering; Optoelectronic applications; Photoluminescence decay; Quantum efficiency; Solution combustion; Thermoluminescence
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	Vasantha library uom
Date Deposited:	28 Nov 2025 09:54
Last Modified:	28 Nov 2025 09:54
URI:	http://eprints.uni-mysore.ac.in/id/eprint/18081

Actions (login required)

View Item