Optimization of luminescence and quantum yield via synergistic energy transfer in Gd3+/Eu3+activated phosphate glasses for red LEDs display technology
Issued Date
2025-01-01
Resource Type
ISSN
02728842
Scopus ID
2-s2.0-105029600144
Journal Title
Ceramics International
Rights Holder(s)
SCOPUS
Bibliographic Citation
Ceramics International (2025)
Suggested Citation
Abbas J., Zaman F., Khan A., Saqib N.U., Rooh G., Choodam K., Kanjanaboos P., Intachai N., Kothan S., Albargi H.B., Kiwsakunkran N., Ali S., Ruangtaweep Y., Chanthima N., Kaewkhao J. Optimization of luminescence and quantum yield via synergistic energy transfer in Gd3+/Eu3+activated phosphate glasses for red LEDs display technology. Ceramics International (2025). doi:10.1016/j.ceramint.2025.12.317 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/115066
Title
Optimization of luminescence and quantum yield via synergistic energy transfer in Gd3+/Eu3+activated phosphate glasses for red LEDs display technology
Corresponding Author(s)
Other Contributor(s)
Abstract
Phosphate glasses with composition 22K<inf>2</inf>O-9Al<inf>2</inf>O<inf>3</inf>-1ZrO<inf>2</inf>-(63-X)P<inf>2</inf>O<inf>5</inf>-5Gd<inf>2</inf>O<inf>3</inf>-XEu<inf>2</inf>O<inf>3,</inf> herein X = 0.0, 0.1, 0.3, 0.5, 1.0, 2.0 mol%, were synthesized by the melt-quenching method. All specimens were investigated for optical, photoluminescence, and lasing properties through various characterization techniques, including optical absorption, photoluminescence excitation and emission spectra, Judd-Ofelt (J-O) analysis, decay time, and quantum yield measurements. The UV–Vis–NIR absorption spectra revealed eight peaks, with a hypersensitive transition located at<sup>7</sup>F<inf>0</inf> →<sup>5</sup>L<inf>6</inf>. The oscillator strengths calculated from the transitions of the absorption spectra showed maximum values for the hypersensitive transition, while the intensity parameters followed the trend Ω<inf>4</inf> > Ω<inf>2</inf> > Ω<inf>6,</inf> quantifying covalency in Eu<sup>3+</sup>–ligand bonds. The photoluminescence spectra recorded at 312 nm corresponded to the<sup>6</sup>P<inf>7/2</inf> → <sup>8</sup>S<inf>7/2</inf> transition for Gd<sup>3+</sup>ions, and 613 nm corresponded to the<sup>5</sup>D<inf>0</inf>→<sup>7</sup>F<inf>2</inf> transition of Eu<sup>3+</sup>ions. Radiative transition probability (A<inf>R</inf>) of 491.53 s<sup>−1</sup>, stimulated emission cross (σ<inf>e</inf>) of 20.15 × 10<sup>−22</sup> cm<sup>2</sup>, branching ratios (β<inf>R</inf>, β<inf>cal</inf>) of 0.7100, 0.4695, and calculated lifetime (τ<inf>R</inf>) of 0.955 ms and experimental lifetime (τ<inf>R</inf>) of 0.762 ms were determined as the optimal radiative parameters for 613 nm emission. Results from the RL spectra were akin to those obtained from the PL emission spectra. The overlap between excitation and emission spectra, as well as the reduction in donor (Gd<sup>3+</sup>) lifetime, confirmed the energy transfer process. The CIE chromaticity coordinates were spotted in the red-orange region. Calculations of the quantum yield showed an increase up to a maximum of 64.69 % at 2.0 mol% Eu<inf>2</inf>O<inf>3</inf>. All results indicate that the synthesized glass samples are promising candidates for solid-state lighting applications.