Synthesis and Photoluminescent Properties of NaYF4:Eu3+ Core and NaYF4:Eu3+/NaYF4 Core/Shell Nanocrystals
Synthesis and Photoluminescent Properties of NaYF4:Eu3+ Core and NaYF4:Eu3+/NaYF4 Core/Shell Nanocrystals
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NaYF4:Eu3核和NaYF4:Eu3/NaYF4核/壳纳米晶的合成及光致发光性能
DOI：
10.1166/jnn.2014.8053
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发表时间：
2014-06-01
影响因子：
--
通讯作者：
Yin, Min
中科院分区：
文献类型：
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作者：
Tian, Xiu-Na;Jiang, Gui-Cheng;Yin, Min
采用湿化学法合成了NaYF 4：Eu 3+核和NaYF 4：Eu 3 +/NaYF 4核/壳纳米晶。透射电子显微镜照片显示核和核/壳纳米粒子是单分散和均匀的纳米粒子，平均直径分别为22和26 nm。研究了样品的光致发光（PL）特性，包括PL激发光谱、发射光谱和发光衰减曲线。结果表明，在NaYF 4：Eu ~（3+）/NaYF 4核/壳结构纳米晶体中，D-5（2）相对于D-5（0）的发射强度比NaYF 4：Eu ~（3+）核结构纳米晶体中的强，且D-5（2）的衰减寿命比NaYF 4：Eu ~（3+）核/壳结构纳米晶体长。此外，从D-5（0）的校正发射光谱，D-5（0）的辐射寿命的计算。这些与测量的D-5（0）发射的衰变寿命一起给出了D-5（0）的本征量子产额。通过考虑表面效应，很好地解释了结果。
NaYF4:Eu3+ core and NaYF4:Eu3+/NaYF4 core/shell nanocrystals (NCs) were synthesized via a wet chemical method. The transmission electron microscope photographs show that the core and core/shell nanoparticles are monodisperse and uniform NCs with average diameters of 22 and 26 nm respectively. The photoluminescence (PL) properties of the samples, including the PL excitation and emission spectra, and luminescent decay curves, are investigated in detail. The results show that the intensity of D-5(2) emission relative to that of D-5(0) is stronger in NaYF4:Eu3+/NaYF4 core/shell NCs than that in NaYF4:Eu3+ core NCs, and a longer decay lifetime of D-5(2) is observed in core/shell samples. In addition, from the corrected emission spectra of D-5(0), the D-5(0) radiative lifetimes were calculated. These together with the measured decay lifetime of D-5(0) emission give the intrinsic quantum yields of D-5(0). The results were well interpreted by considering the surface effects.