Open Access Article
This Open Access Article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported LicenceMultimodal Luminescence and Energy Transfer Mechanism in Narrowband UVB Emitting Phosphor System towards Futuristic Phototherapeutic Devices
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Aachal A Sharma , Payal P Pradhan , K. A. K. Durga Prasad , M. Rakshita , Raju Pembarthi and D. Haranath
First published on 30th September 2025
Abstract
This study explores the synthesis and spectroscopic characterization of Gd3+-activated CaMgSi2O6 phosphors, prepared via a high-temperature modified solid-state reaction method, for narrow-band ultraviolet B (n-UVB) phototherapeutic applications. The incorporation of Gd3+ ions into the CaMgSi2O6 host lattice induces sharp and intense emission at 314 nm, corresponding to the 6 P7/2 → 8 S7/2 intra-configurational transition under 274 nm excitation. Photoluminescence (PL) studies revealed five distinct 4f-4f, 4f5d transitions, with the optimal composition, Ca0.95MgSi2O6:0.05Gd 3+ , exhibiting optimal emission intensity suitable for treating skin disorders such as psoriasis. Fourier Transform Infrared (FTIR) spectroscopy confirmed the silicate matrix's structural integrity, while Diffuse Reflectance Spectroscopy (DRS) indicated a reduced band gap upon Gd 3+ doping. Temperature-dependent PL and time-resolved PL analyses elucidated the thermal stability and energy transfer dynamics, respectively, highlighting efficient radiative recombination. These findings underscore the potential of Gd3+ -activated CaMgSi2O6 as a promising material for futuristic phototherapy devices, offering precision and portability in dermatological treatments.