TiO_2壳层包裹增强β-NaYF_4:Yb^(3+),Er^(3+)耐热性及上转换发光性能  

Enhanced up-conversion emission and heat resistance ofβ-NaYF_4:Yb^(3+),Er^(3+) core coated with TiO_2 shell

作　　者：黄亨明[1] 操林海[1] 王剑[1] 倪亚茹[1] 陆春华[1] 许仲梓[1] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2016年第1期1-6,12,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省高校自然科学研究重大项目(10KJA430016);江苏省自然科学基金(BK20141459);江苏高校优势学科建设工程

摘　　要：以体积比1:1的乙醇/水为溶剂,以聚乙烯吡咯烷酮(PVP)为表面活性剂,通过简单的一步溶剂热法在β-NaYF_4:Yb^(3+),Er^(3+)表面包裹一层TiO_2,构筑β-NaYF_4:Yb^(3+),Er_^(3+)@TiO_2核壳结构上转换发光材料。采用X线衍射仪(XRD)、场发射扫描电镜(FESEM)、傅里叶变换红外光谱仪(FT-IR)、荧光光谱仪等测试手段对所制备样品的物相结构、形貌特征和发光性质进行研究。结果表明:微米β-NaYF_4:Yb^(3+),Er^(3+)晶粒表面成功包裹了一层TiO_2,构筑了核壳结构。纯β-NaYF_4:Yb^(3+),Er^(3+)在热处理后上转换发光强度显著降低,而核壳结构材料经过600℃的高温热处理60 min,上转换发光强度显著提高,这主要得益于内核结晶质量的提高且表面缺陷浓度的降低。The β-NaYF4：Yb3＋,Er3＋ TiO2 up-conversion material with core-shell structure was synthesized by a facile one-step solvent-thermal method.The TiO2 was coated on the surface of β-NaYF4：Yb3＋,Er3＋ with polyvinyl pyrrolidone （PVP） as surface active agent in 1：1 ethanol/water solution （by volume）. X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM）, Fourier transform infrared （FT-IR）, and fluorescence spectrometer were used to characterize and study the phase, morphology and luminescent properties of as-prepared products. Results revealed that TiO2 was coated on β-NaYF4：Yb3＋,Er3＋ microcrystal with a core-shell structure. The as-prepared material was annealed at 600℃ for 60 min. Up-conversion luminescence intensity of β-NaYF4 ： Yb3＋, Er3＋ decreased while the core-shell structure material enhanced obviously after annealing treatment due to the improvement of crystalline quality and the decline of surface defects concentration on the protection of TiO2 shell.

关 键 词：β-NaYF_4 上转换 核壳结构 耐热性 

分 类 号：TQ174[化学工程—陶瓷工业]