热处理温度对β-NaYF4:Yb3+、Er3+纳/微米颗粒上转换发光性能的影响

doi:10.3724/SP.J.1077.2013.12172

摘要/Abstract

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。

关键词: β, -NaYF₄, 纳/微米颗粒, 热处理, 上转换发光

Abstract:

β-NaYF₄:20%Yb³⁺,2%Er³⁺ 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 upconversion 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 surface 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.

Key words: &#x003b2, -NaYF₄, nano/microparticles, thermal treatment, upconversion

中图分类号:

O482

丁明烨, 陆春华, 黄文娟, 蒋晨飞, 倪亚茹, 许仲梓. 热处理温度对β-NaYF₄:Yb³⁺、Er³⁺纳/微米颗粒上转换发光性能的影响[J]. 无机材料学报, 2013, 28(2): 146-152.

DING Ming-Ye, LU Chun-Hua, HUANG Wen-Juan, JIANG Chen-Fei, NI Ya-Ru, XU Zhong-Zi. Effect of Heat-treatment Temperature on Upconversion Luminescence of β-NaYF₄:Yb³⁺,Er³⁺ Nano/Microparticles[J]. Journal of Inorganic Materials, 2013, 28(2): 146-152.

图/表 7

图1 溶剂热法(a, a1 and a2)和热分解法(b, b1 and b2)制备的β-NaYF4:20%Yb3+,2%Er3+晶体的FE-SEM照片和粒径尺寸(宽厚和厚度)分布图

Fig. 1 FE-SEM image and size distribution of β-NaYF4:20%Yb3+, 2%Er3+ nano/microparticles prepared by solvothermal (a, a1 and a2) and thermal decomposition method (b, b1 and b2)

图2 溶剂热法(a)和热分解法(b)制备的β-NaYF4:20%Yb3+, 2%Er3+晶体的XRD图谱

Fig. 2 XRD patterns of β-NaYF4:20%Yb3+, 2%Er3+ nano/ microparticles prepared by solvothermal (a) and thermal decomposition method (b), respectively

图3 溶剂热法(a)和热分解法(b)制备的β-NaYF4:20%Yb3+, 2%Er3+颗粒的TG-DTA曲线

Fig. 3 TG-DTA curves of β-NaYF4:20%Yb3+, 2%Er3+ nano/ microparticles prepared by solvothermal (a) and thermal decomposition method (b)

图4 溶剂热法(a)和热分解法(b)制备的β-NaYF4:20%Yb3+, 2%Er3+颗粒经不同温度热处理后的XRD图谱

Fig. 4 XRD patterns of β-NaYF4:20%Yb3+, 2%Er3+ nano/ microparticles annealed by different temperatures

图5 溶剂热法(a)和热分解法(b)制备的β-NaYF4:20%Yb3+, 2%Er3+颗粒在不同热处理温度下的FT-IR图

Fig. 5 FT-IR spectra of β-NaYF4:20%Yb3+, 2%Er3+ nano/microparticles annealed by different temperatures

图6 溶剂热法(a)和热分解法(b)制备的β-NaYF4:20%Yb3+, 2%Er3+颗粒经不同热处理温度的SEM照片

Fig. 6 SEM images of β-NaYF4:20%Yb3+, 2%Er3+ nano/microparticles annealed by different temperatures

图7 溶剂热法(A)和热分解法(B)制备的β-NaYF4:20%Yb3+, 2%Er3+颗粒在不同热处理温度下的发射光谱图

Fig. 7 Room temperature fluorescence spectra of β-NaYF4:20%Yb3+, 2%Er3+ nano/microparticles annealed by different temperatures

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热处理温度对β-NaYF₄:Yb³⁺、Er³⁺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-NaYF₄:Yb³⁺,Er³⁺ Nano/Microparticles

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