Sol-gel法制备SrTiO_3:0.002Pr磷光体的研究(英文)  

Sol-Gel Synthesis and Characterization of SrTiO_3:0.002Pr Phosphor

作　　者：张朋越[1,2] 洪樟连[2] 葛洪良[1] 任柳峰[1] 郭西洋 樊先平[2] 

机构地区：[1]浙江省磁学重点实验室,中国计量学院材料科学与工程学院,浙江杭州310018 [2]浙江大学材料化工学院,浙江杭州310027

出　　处：《稀有金属材料与工程》2008年第A02期456-459,共4页Rare Metal Materials and Engineering

基　　金：Supported by Projeet of SRF for ROCS,SEM(2003-14)

摘　　要：采用Sol-gel法制备了具有粒径均匀分布的Pr离子单掺SrTiO3:0.002Pr纳米磷光体。通过DTA、XRD和PL对样品的成相过程和晶体结构及其光谱性能进行了测试分析。DTA和XRD分析结果表明:前驱体在较低温度(<500℃)加热就已经有立方相SrTiO3纳米晶析出,经935℃加热后完全形成单一立方相SrTiO3纳米晶,空间群为Pm-3m(221),经Scherrer公式计算得磷光体的晶粒尺寸约为82 nm。光谱性能研究表明,磷光体的发光性能受烧结温度影响非常明显。对应于Pr离子1D2→3H4能级跃迁的红色发光强度随着烧成温度从600℃升高到1300℃过程中逐渐增大,但发射谱的形状和主峰位置均保持不变。Ultra-fine and nanocrystalline Pr doped SrTiO3：0.002Pr phosphor was prepared by sol-gel method. The phase formation and luminescent property of the samples were characterized by differential thermal analysis （DTA）, X-ray diffraction （XRD） and spectrophotometer. The results of DTA and XRD showed that prepared gels began to transform into the strontium titanate with cubic perovskite phase by heat treatment at 500 ℃ and the reaction was completed approximately at about 935℃. At 935 ℃ the grain size was estimated to be about 82 nm through Scherrer＇s formula. The luminescent results showed a strong dependence of the luminescent intensity on heating temperature for the gels. The red emission peak at 617 nm was attributed to 1D2→3H4 of Pr3＋ ions, which increased gradually as the calcination temperature rose from 600 ℃ to 1300 ℃. The luminescent intensity at 1300 ℃ was enhanced about 7.4 times compared with that obtained at 600 ℃. However, the site and shape of emission peak remained.

关 键 词：SrTiO3:Pr sol—gel 纳米晶 发光 

分 类 号：O614[理学—无机化学]