热处理温度对β-NaYF_4:Yb^(3+)、Er^(3+)纳/微米颗粒上转换发光性能的影响  

Effect of Heat-treatment Temperature on Upconversion Luminescence of β-NaYF_4 :Yb^(3+) ,Er^(3+) Nano/Microparticles

作　　者：丁明烨[1] 陆春华[1] 黄文娟[1] 蒋晨飞[1] 倪亚茹[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,210009

出　　处：《无机材料学报》2013年第2期146-152,共7页Journal of Inorganic Materials

基　　金：江苏高校优势学科建设工程资助项目(PADP);江苏省高校自然科学研究重大资助项目(10KJA430016);江苏省普通高校研究生科研创新计划项目(CXLX11_0355)~~

摘　　要：采用溶剂热法和热分解法分别制备纳/微米的β-NaYF4:20%Yb3+,2%Er3+晶体.根据两种不同粒径颗粒的TG-DTA测试分析,对其进行不同温度的热处理。通过XRD、SEM、FT-IR以及PL等手段研究不同热处理温度对两种粒径的颗粒的尺寸、形貌以及上转换发光性能的影响.研究结果表明,随着热处理温度的升高,纳/微米颗粒的发光性能主要呈现出先升高后下降的趋势。与未作热处理样品对比发现,适当的热处理(580℃)可以提高纳米颗粒的发光强度,却不利于改善微米颗粒发光性能。分析认为,结晶质量的提高、缺陷浓度的降低以及有机配体的去除,导致了纳/微米颗粒的发光性能的逐步提高。而过高处理温度(>580℃)引起的相转变(β→α)和表面Na2CO3的生成又大大降低了稀土离子的发光效率。热处理过程中颗粒之间的不同团聚程度是造成纳/微米颗粒发光性能差异变化的主要原因。β-NaYF4：20Yb^3＋, 2Er^3＋ nano/microparticles were successfully synthesized by solvothermal and thermal decomposition method. According to the results obtained with TG-DTA, the as-synthesized samples were heat-treated at different temperatures in air. The microstructure, morphology and upconversion luminescence property of annealed samples were characterized by XRD, SEM, FT-IR and photoluminescence （PL） spectra. The results show that the total upconversion luminescence intensity of nano/microparticles firstly increases and then decreases with a rise of temperature. Comparing with the as-prepared samples, appropriate heat treatment temperature （580℃） can improve up- conversion luminescence property of nanoparticles. The results in present research indicate that the improvement of crystallization, the decrease in the concentration of defects and the decomposition of the organic molecules on the sur-face of the particles induce the enhancement of upconversion luminescence. However, the intensity of upconversion luminescence decreases sharply under higher temperature treatment （〉580℃）, which may be due to the phase transition （β→α） and the existence of Na2CO3. The differences in luminescence property between nanoparticles and microparticles are mainly attribute to different agglomeration degree of particles during thermal treatment.

关 键 词：β-NaYF4 纳 微米颗粒 热处理 上转换发光 

分 类 号：O482[理学—固体物理]