溶胶-凝胶法合成KGd(WO_4)_2:Eu^(3+)红色荧光粉及其发光性质的研究  

Photoluminescent Properties of KGd(WO_4)_2:Eu^(3+) Red Phosphor Prepared by Sol-Gel Method

作　　者：游航英[1,2] 廖金生[2] 温和瑞[1,2] 张绍安[2] 陈景林[2] 黄海平[2] 

机构地区：[1]赣南师范学院化学与生命科学学院,江西赣州341000 [2]江西理工大学材料与化学工程学院,江西赣州341000

出　　处：《中国稀土学报》2011年第2期178-184,共7页Journal of the Chinese Society of Rare Earths

基　　金：江西省自然科学基金(2010GZW0022);江西省教育厅项目(GJJ10472)资助

摘　　要：采用溶胶-凝胶法合成KGd(WO4)2:Eu3+红色荧光粉。该荧光粉的性质通过X射线粉末衍射、扫描电子显微镜、激发谱、发射谱以及荧光衰减曲线来表征。KGd(WO4)2:Eu3+的激发谱主要由中心大约在270 nm处的宽谱峰以及一系列由Eu3+离子f-f电子能级跃迁导致的锐线峰组成,在近紫外区有一个最强的激发峰在395 nm。正好与紫外InGaN发光二极管(LED)芯片发射波长匹配。在395 nm激发下,可以观察到最佳掺杂量为40%(原子分数)的KGd(WO4)2:Eu3+在614 nm处产生强烈的红光。发光特性表明,KGd(WO4)2:Eu3+荧光粉可能潜在成为近紫外发光二极管(LEDs)用的红色荧光粉。KGd（WO4）2： Eu3＋ red phosphors were prepared by sol-gel method.The properties of the resulting phosphors were characterized by X-ray diffraction,scanning electron microscopy,excitation spectra,emission spectra and decay curve.The excitation spectra of KGd（WO4）2： Eu3＋ phosphors were mainly attributed to WO2-4 and Eu-O charge-transfer band at about 270 nm,and some sharp lines were also attributed to Eu3＋ f-f transitions in near-UV regions with the strongest peaks at 395 nm.Under the 395 nm excitation,the intense red emission peak at 614 nm were observed for 40%（atom fraction） KGd（WO4）2： Eu3＋ phosphors as the optimum dopant concentration.The strongest line（395 nm） in excitation spectra of these phosphors matched well with the output wavelength of UV InGaN-based light-emitting diodes（LEDs） chip.The luminescent properties suggested that KGd（WO4）2： Eu3＋ phosphor might be regarded as a potential red phosphor candidate for near-UV LEDs.

关 键 词：发光材料 溶胶-凝胶法 红色荧光粉 钨酸盐 稀土 

分 类 号：O614.338[理学—无机化学]