Exploring one material for dual applications:A red-emitting Mg_(2)GeO_(4):Eu^(3+)nanophosphor for future generation energy efficient WLEDs and dosimetric applications  

作　　者：Akshay Arjun G.P.Darshan S.C.Sharma H.Nagabhushana D.V.Sunitha H.B.Premkumar 

机构地区：[1]Department of Physics,Faculty of Mathematical and Physical Sciences,M.S.Ramaiah University of Applied Sciences,Bengaluru,560054,India [2]Honorary Professor of Law and Forensic Materials,Jain University,Bengaluru,560069,India [3]C.N.R.Rao Centre for Advanced Materials,Tumkur University,Tumkur,572103,India [4]School of Applied Sciences(Physics),REVA University,Bengaluru,560064,India

出　　处：《Journal of Rare Earths》2024年第10期1835-1845,共11页稀土学报（英文版）

基　　金：Project supported by the Department of Science&Technology(DST)(Science and Engineering Research Board(SERB)-Core Research Grant(CRG))Government of India(CRG/2020/006446)。

摘　　要：The envisaged design and developme nt of individual mate rials to excavate a broader spectrum of desired properties and offer multiple applications are highly necessitating.Keeping this in mind,a series of forsterite-structured Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors was synthesized via a solution combustion method using oxalyl dihydrazide as a fuel.The X-ray diffraction patterns confirm the orthorhombic crystal system with a Puma space group.Morphological results clearly show irregularly shaped cluster-like structures with aggregation of the particles.Employing diffuse reflectance spectra,the optical energy band gap of the Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors was estimated and obtained to be~4.12-4.32 eV.The photoluminescence emission spectra exhibit intense peaks at^(5)79,589,610,661,and 707 nm,which are due to characteristic^(5)D_(0)→^(7)F_(0),^(5)D_(0)→^(7)F_(1),^(5)Do→^(7)F_(2),^(5)D_(0)→^(7)F_(3)and^(5)D_(0)→^(7)F_(4)transitions of Eu^(3+)ions,respectively.The Commission International de L'Eclairage color coordinates are gradually tuned from pale red(0.5980,0.4012)to a pure red(0.6385,0.3611)region.Thermoluminescence glow peaks showcase excellent super-linear response at low doses ofγ-irradiations,indicating that the prepared phosphor can be used in thermoluminescent personal dosimetry which is a biological tissue equivalent.The aforementioned results demonstrate that the prepared Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors are considered an excellent candidate for dual applications,i.e.,red component in future generation white-light-emitting diodes(WLEDs)and personal dosimetric applications.

关 键 词：NANOPHOSPHORS Photoluminescence THERMOLUMINESCENCE DOSIMETRY Photometric properties Rare earths 

分 类 号：TN312.8[电子电信—物理电子学] TQ422[化学工程]