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作 者:蒲勇[1] 刘碧桃[1] 朱达川[2] 彭玲玲[1] 韩涛[1] 于泓[1]
机构地区:[1]重庆文理学院新材料技术研究院重庆市高校微纳米材料工程与技术重点实验室,重庆402160 [2]四川大学,四川成都610065
出 处:《稀有金属材料与工程》2015年第10期2529-2533,共5页Rare Metal Materials and Engineering
基 金:国家自然科学基金(51302330);重庆市高校微纳米材料工程与技术重点实验室开放课题(KFJJ1302)
摘 要:采用溶剂热-溶胶凝胶两步法合成了(Y1-z,Gd z)1-x-y(P z,V1-z)O4:x Eu3+,yBi3+系列红色荧光粉。用XRD、SEM和荧光分光光度计,对试样的晶体结构、表面形貌及发光性能进行了表征。结果表明:样品为四方晶系,掺杂离子的加入对基质晶体结构影响不大;样品形貌均一,呈短杆状或椭圆状;激发光谱由位于250~400 nm的O2--V5+带和Eu3+-O2-带组成;最强发射峰位于619 nm,归属于Eu3+的5D0→7F2特征跃迁发射;Eu3+的最佳掺杂量为5 mol%(x=0.05);掺杂Bi3+、Gd3+、P5+后,样品发射强度得到显著提高,Bi3+的掺杂还会使激发带红移至400 nm。说明这类荧光粉是可用于近紫外芯片激发的白光LED用红色荧光粉。A series of(Y1-z,Gd z)1-x-y(P z,V1-z)O4: xEu3+,y Bi3+ red phosphors have been synthesized by a solvent thermal-sol gel method. The crystal structure, surface morphology and spectral characteristics of the samples were investigated by X-ray diffraction(XRD), SEM and fluorescence spectrophotometer, respectively. It is found that the synthesized crystalline powders are of tetragonal system. The doped ions have little impact on the matrix crystal structure. The sample grains show short rods or elliptical and the structure is uniform and loose. The excitation spectrum is composed of the broadband in 250-400 nm(O2--V5+ band and Eu3+-O2- band). The strongest emission peak locates at 619 nm(Eu3+: 5D0→7F2). The best doping amount of Eu3+ is 5 mol% and the excess concentration will lead to concentration quenching. The co-doping of Bi3+, Gd3+ and P5+ can improve the luminous intensity of the samples significantly. The doping of Bi3+ can make the excitation band move to near 400 nm, indicating samples can match with the N-UV chips and then be used in white-LEDs.
关 键 词:白光LED (Y Gd)(P V)O4:Eu^3+ Bi^3+ 两步法 红色荧光粉
分 类 号:TN312.8[电子电信—物理电子学] TQ422[化学工程]
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