Sm3+-Doped Y2Ge2O7 Orange-Red Phosphor Prepared via the Sol–Gel Method for Multimodal Applications: A Study of of the Effect of Dopant Concentration on Structural and Optical Properties
- 1Universidade Federal de Goiás , , , ,
- 2Instituto Tecnológico de Aeronáutica , , ,
Abstract
This work reports, for the first time, the synthesis of single-phase trivalent samarium-doped yttrium pyrogermanate (Y2Ge2O7:xSm3+) phosphors via the sol–gel method. The crystalline structure, photoluminescence mechanisms, energy transfer dynamics, and optical thermometry properties were systematically investigated. The experimental optical bandgap (∼5.99–6.10 eV) shows good agreement with those obtained from the density functional theory (DFT) calculations. Upon Sm3+ incorporation, a concentration quenching effect reduces the quantum yield from 8.1% to 0.3%, correlated with a reduction in the average lifetime from 2.08 to 0.61 ms. Analysis of the decay kinetics via the Van Uitert model indicates a dipole–dipole interaction governing the energy transfer, achieving a cross-relaxation efficiency of ∼73% at 4.0 mol %. Remarkably, the CIE coordinates, correlated color temperature (CCT), and color purity (CP) remain independent of the dopant content, exhibiting an exceptional red color purity above 95% for all samples. These results demonstrate that Y2Ge2O7xSm3+ phosphors are promising candidates for solid-state lighting and multifunctional optical applications. Additionally, the ratio between emission sub-bands from 4G5/2 → 6H9/2 to 4G5/2 → 6H5/2 provides a relative sensitivity value (SR) for the sample with 4.0 mol % up to 0.23%/K, indicating a potential use as an optical sensing thermometer.
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BibTeX
@article{garcia2026sm3doped,
title = {{Sm3+-Doped Y2Ge2O7 Orange-Red Phosphor Prepared via the Sol–Gel Method for Multimodal Applications: A Study of of the Effect of Dopant Concentration on Structural and Optical Properties}},
author = {Amanda Alencar Arrais de Garcia and Isabella Lima Caetano and Francisco Alisson da Silva Torquato and Marcelo Marques and Lara K. Teles and Renato Borges Pontes and Lauro June Queiroz Maia and Ricardo Costa de Santana},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c05178},
url = {https://pubs.acs.org/acsodf/article/11/42/64870/5450089/Sm3-Doped-Y2Ge2O7-Orange-Red-Phosphor-Prepared-via},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Sm3+-Doped Y2Ge2O7 Orange-Red Phosphor Prepared via the Sol–Gel Method for Multimodal Applications: A Study of of the Effect of Dopant Concentration on Structural and Optical Properties
AU - Amanda Alencar Arrais de Garcia
AU - Isabella Lima Caetano
AU - Francisco Alisson da Silva Torquato
AU - Marcelo Marques
AU - Lara K. Teles
AU - Renato Borges Pontes
AU - Lauro June Queiroz Maia
AU - Ricardo Costa de Santana
PY - 2026
DA - 2026/10/13
JO - ACS Omega
DO - 10.1021/acsomega.6c05178
UR - https://pubs.acs.org/acsodf/article/11/42/64870/5450089/Sm3-Doped-Y2Ge2O7-Orange-Red-Phosphor-Prepared-via
AB - This work reports, for the first time, the synthesis of single-phase trivalent samarium-doped yttrium pyrogermanate (Y2Ge2O7:xSm3+) phosphors via the sol–gel method. The crystalline structure, photoluminescence mechanisms, energy transfer dynamics, and optical thermometry properties were systematically investigated. The experimental optical bandgap (∼5.99–6.10 eV) shows good agreement with those obtained from the density functional theory (DFT) calculations. Upon Sm3+ incorporation, a concentration quenching effect reduces the quantum yield from 8.1% to 0.3%, correlated with a reduction in the average lifetime from 2.08 to 0.61 ms. Analysis of the decay kinetics via the Van Uitert model indicates a dipole–dipole interaction governing the energy transfer, achieving a cross-relaxation efficiency of ∼73% at 4.0 mol %. Remarkably, the CIE coordinates, correlated color temperature (CCT), and color purity (CP) remain independent of the dopant content, exhibiting an exceptional red color purity above 95% for all samples. These results demonstrate that Y2Ge2O7xSm3+ phosphors are promising candidates for solid-state lighting and multifunctional optical applications. Additionally, the ratio between emission sub-bands from 4G5/2 → 6H9/2 to 4G5/2 → 6H5/2 provides a relative sensitivity value (SR) for the sample with 4.0 mol % up to 0.23%/K, indicating a potential use as an optical sensing thermometer.
SN - 2470-1343
ER -