Thermoluminescent and photoluminescent properties of CaGd2ZnO5:Er3+ phosphors: Insights into dosimetry and w-LED fabrication

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-05-12 DOI:10.1016/j.jlumin.2025.121295

I.S. Pruthviraj , B.R. Radha Krushna , K. Karthikeyan , S.C. Sharma , S.S. Mohapatra , K. Manjunatha , Sheng Yun Wu , K.N. Narasimhamurthy , F. Femila Komahal , H. Nagabhushana

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引用次数: 0

Abstract

A series of CaGd_2-xZnO₅:xEr³⁺ (CGZO:Er³⁺) phosphors, doped with Er³⁺ at concentrations ranging from 1 to 5 mol %, were synthesized using the solution combustion method, employing Mimosa pudica (M.P.) extract as a natural fuel. Comprehensive characterization was conducted through powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Thermoluminescence (TL) investigations were performed to analyze dose response, reproducibility, fading, and the material's sensitivity to gamma (γ) and X-ray photons. The phosphors demonstrated a linear TL response across a γ dose range of 0.01–100 Gy, with 32.17 % fading over a two-month period, highlighting their potential for medical dosimetry. Curve fitting of TL glow peaks through CGCD (Computerized Glow Curve Deconvolution) revealed multiple overlapping peaks below the primary peak at 146 °C, corresponding to activation energies between 0.8 and 2.1 eV. Higher heating rates reduced the peak intensity and area, underscoring the role of thermal stimulation in modulating trap depth characteristics. Photoluminescence (PL) measurements indicated intense green emissions at 553 nm under 378 nm excitation, attributed to intra-4f transitions of Er³⁺ ions. Temperature-dependent PL (TDPL) demonstrated thermally stable luminescence, linking dopant ion symmetry to emission efficiency. The phosphors exhibited excellent color purity (∼99.7 %), with favourable CIE chromaticity coordinates (0.2971, 0.6956) and a correlated color temperature (CCT) of 6004 K. White-light-emitting diodes (w-LEDs) fabricated using the phosphors displayed a high color rendering index (CRI) (R_a = 95) alongside optimized chromaticity coordinates (0.3261, 0.3378) and a CCT of 5790 K. These findings highlight the phosphors as strong candidates for green light emission in horticultural lighting and solid-state devices. Furthermore, the robust TL properties establish them as viable materials for γ dosimetry, reinforcing their suitability for medical applications.

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CaGd2ZnO5:Er3+荧光粉的热致发光和光致发光性能：剂量学和w-LED制造的见解

以含羞草（Mimosa pudica, mp）提取物为天然燃料，采用溶液燃烧法合成了一系列掺Er3+的CaGd2-xZnO5:xEr3+ (CGZO:Er3+)荧光粉，Er3+的掺杂浓度为1 ~ 5 mol %。通过粉末x射线衍射（PXRD）、扫描电子显微镜（SEM）、能量色散x射线分析（EDX）、透射电子显微镜（TEM）和x射线光电子能谱（XPS）进行了综合表征。热释光（TL）研究分析了剂量响应、再现性、褪色以及材料对γ (γ)和x射线光子的敏感性。在0.01-100 Gy的γ剂量范围内，荧光粉表现出线性TL响应，在两个月内消退32.17%，突出了它们在医学剂量学方面的潜力。通过CGCD（计算机化辉光曲线反褶积）对TL发光峰进行曲线拟合，发现在146℃时，在原峰下方有多个重叠峰，对应的活化能在0.8 ~ 2.1 eV之间。较高的升温速率降低了峰值强度和面积，强调了热刺激在调节圈闭深度特征中的作用。光致发光（PL）测量表明，在378 nm激发下，在553 nm处有强烈的绿色发射，这是由于Er3+离子的4f内跃迁。温度相关的发光二极管（TDPL）表现出热稳定的发光，将掺杂离子对称性与发射效率联系起来。该荧光粉具有优异的色纯度（~ 99.7%），良好的CIE色度坐标（0.2971,0.6956）和6004 K的相关色温（CCT）。使用该荧光粉制备的白色发光二极管（w- led）具有较高的显色指数（CRI）（Ra = 95）、优化的色度坐标（0.3261,0.3378）和5790 K的CCT。这些发现突出了荧光粉在园艺照明和固态器件中作为绿光发射的强有力候选者。此外，坚固的TL特性使它们成为γ剂量学的可行材料，加强了它们在医疗应用中的适用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.