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.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
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
