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中文摘要：
采用热溶剂法制备了NaYF4∶Tb^3＋,Er^3＋六角相纳米粒子,分析了合成条件对六角相粒子形成的影响。较高的反应温度有利于六角相NaYF4晶体的形成。实验结果表明：六角相是热力学更稳定和更有序的结构,从立方相到六角相的转变是从无序到有序结构的转变。随着尺寸的减小,纳米粒子的下转换效率明显降低。为进一步比较,制备了NaYF4∶Tb^3＋,Er^3＋核壳结构的纳米粒子。包覆后的纳米粒子的下转换效率明显提高,其原因是包覆减少了表面缺陷进而降低了表面激发能量的猝灭。
英文摘要：
Nanoparticles NaYF4∶Tb3＋,Er3＋ with hexagonal phase were synthesized by hot solvent method and the influences of synthesis conditions on the formation and size of particles were also analyzed.The reaction temperature is the dominate condition.The results confirm that some conclusions that the hexagonal phase is thermodynamically more stable and a more orderly structure.It is found that with the nano-size decreasing,the conversion efficiency is significantly reduced.NaYF4∶Tb3＋,Er3＋ nanoparticles with core/shell structure were prepared to analyze and compare further.It is indicated that the luminescence of the NaYF4∶Tb3＋,Er3＋ particles with core/shell structure were enhanced significantly due to the reduced surface defects and the suppressed excitation energy quench.
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