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用于照明应用的具有良好热稳定性的绿色发光 YSiO:Tb 纳米磷光体：自燃合成及其结构和光致发光特性

Cool green-emissive YSiO:Tb nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications.

作者信息

Kumar Pawan, Singh Devender, Kadyan Sonika, Kumar Harish, Kumar Ramesh

机构信息

Department of Chemistry, Maharshi Dayanand University Rohtak-124001 Haryana India

Department of Chemistry, School of Chemical Sciences, Central University of Haryana Mahendergarh-123031 India.

出版信息

RSC Adv. 2024 May 22;14(23):16560-16573. doi: 10.1039/d4ra02571g. eCollection 2024 May 15.

DOI:10.1039/d4ra02571g
PMID:38779388
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11109845/
Abstract

A cheap, versatile, sustainable and energy-efficient gel-combustion method was applied to develop a series of green-emitting down-converted YSiO:Tb (YPS:Tb) nanophosphors. Employing XRD-based Rietveld refinement approach, the phase purity and crystallographic evaluation of the produced phosphor were conducted, revealing a triclinic crystal with 1̄ space group. EDX and TEM analyses were performed on the synthesized samples to determine their elemental composition and morphological properties. Diffuse reflectance spectra yielded 5.61 eV and 5.79 eV optical energy band gaps for the host and the optimized (0.04 mole of Tb) sample, respectively. UV light has the ability to excite the nanocrystalline phosphor in an efficient manner, leading to significant luminosity qualities attributed to the radiative relaxation of D → F ( = 6, 5, 4, 3). The bi-exponential decay function was derived by the PL decay curves. With an activation energy of 0.2206 eV, the YSiO:0.04Tb phosphor exhibits good thermal quenching capabilities. Improved photometric attributes including CIE coordinates, CCT and color purity confirmed the green glow, indicating a strong competitor for cool-green emission in lighting applications.

摘要

采用一种廉价、通用、可持续且节能的凝胶燃烧法制备了一系列发射绿光的下转换YSiO:Tb（YPS:Tb）纳米磷光体。利用基于XRD的Rietveld精修方法对制备的磷光体进行了相纯度和晶体学评估，结果表明其为具有1̄空间群的三斜晶体。对合成样品进行了EDX和TEM分析，以确定其元素组成和形态特性。漫反射光谱显示，主体材料和优化后的（0.04摩尔Tb）样品的光学能带隙分别为5.61 eV和5.79 eV。紫外光能够有效地激发纳米晶磷光体，从而产生归因于D→F（=6、5、4、3）辐射弛豫的显著发光特性。通过PL衰减曲线得到了双指数衰减函数。YSiO:0.04Tb磷光体的激活能为0.2206 eV，具有良好的热猝灭能力。包括CIE坐标、CCT和色纯度在内的改进光度学属性证实了其绿色发光，表明它在照明应用中是冷绿色发射的有力竞争者。

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