Photoluminescence properties and thermal stability of Eu^(3+)-activated La_(7)Ta_(3)W_(4)O_(30) red-emitting phosphors for near-UV-excited w-LEDs

作     者：Yu Ren Bin Deng Ting Liang Shuang Shu Junlan Guo Shoucheng Zhao Ruijin Yu Yu Ren;Bin Deng;Ting Liang;Shuang Shu;Junlan Guo;Shoucheng Zhao;Ruijin Yu

作者机构：College of Chemistry&PharmacyNorthwest A&F UniversityYangling 712100China College of Chemistry&Biology and Environmental EngineeringXiangnan UniversityChenzhou 423043China Hunan Provincial Key Laboratory o/Xiangnan Rare-Precious Metals Compounds Research and ApplicationXiangtan UniversityChenzhou 423043China College of Materials and Chemical EngineeringKey Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2021年第39卷第8期

页      面：905-912页

核心收录：

学科分类：081702[工学-化学工艺] 0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0817[工学-化学工程与技术] 0708[理学-地球物理学] 0703[理学-化学] 

基　　金：Project supported by the Fundamental Research Funds for the Central Universities(2452019076) Undergraduate Innovation Fund of Northwest A&F University China(201910712037) Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications(2019XGJSKFJJ01) the Construction Program of the Key Discipline in Hunan Province the Projects of the Education Department of Hunan Province(18A465) Science and Technology Plan Project of Chenzhou City(jsyf2017014)。 

主　　题：Luminescence Phosphor Tungstate La_(7)Ta_(3)W_(4)O_(30) Rare earths 

摘      要：Novel trivalent europium(Eu^(3+))-activated La_(7)Ta_(3)W_(4)O_(30):xEu^(3+)(x=0.5 mol%-40 mol%) red-emitting phosphors were synthesized by means of a high-temperature solid-state reaction.The structure,morphology,photoluminescence,thermal-stability properties,lifetime,and color-rendering of the prepared phosphors were investigated in detail.The La_(7)Ta_(3)W_(4)O_(30):Eu^(3+) phosphors show five emission peaks under near-ultraviolet(n-UV) at 397 nm,and these peaks are ascribed to the transitions of ^(5)D0-^(7)Fj(j=0,1,2,3 and 4) by Eu^(3+) ions.The optimal doping concentration of Eu^(3+) is 20 mol%,and the critical distance of the energy transfer between the Eu^(3+)ions was calculated to be 1.768 nm.The quenching temperature(T_(0.5)) of La_(7)Ta_(3)W_(4)O_(30):20 mol%Eu^(3+) is about 440 K.The quantum yield(QY) was measured to be 85.85%.The fabricated white-light-emitting diodes(w-LEDs) possess high color-rendering index(R_(a)) of 90,and high correlated color temperature(CCT) of 5810 K,respectively.The Commission Internationale de L’Eclairage(CIE) coordinates are(0.311,0.322).Therefore,the prepared phosphor has a promising application for w-LEDs.