On the quantitative absorption and Stokes shift in PbSe quantum dots embedded in glasses

On the quantitative absorption and Stokes shift in PbSe quantum dots embedded in glasses
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玻璃中 PbSe 量子点的定量吸收和斯托克斯位移

DOI:
10.1007/s00340-014-5957-0
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发表时间:
2015
影响因子:
2.1
通讯作者:
Cheng Cheng
Cheng Cheng
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Ma Dewei;Jiang Huilv;Cheng Cheng

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采用简单的熔融退火技术在硅酸盐玻璃中合成了PbSe量子点。透射电子显微镜分析证明了玻璃中PbSe量子点的形成。吸收光谱表明,光吸收主要来自玻璃中的PbSe量子点,第一激子跃迁的能量积分摩尔消光系数仅为胶体PbSe量子点的1/10左右。光致发光分析表明,福斯特能量转移是负责的PL峰的形状。对于在5.2 nm的小半径的PbSe量子点的样品,一个显着的斯托克斯位移为70 meV,黄-里斯因子计算为2.1。
The synthesis of PbSe quantum dots (QDs) in silicate glasses was achieved by a simple melt-annealing technique. Transmission electron microscopy analysis proves the formation of PbSe QDs in glasses. The absorption spectra show that the light absorption originates from the PbSe QDs in glasses mostly, and the energy-integrated molar extinction coefficient for the first exciton transition was deemed to be only about 1/10 of those from colloidal PbSe QDs. The photoluminescence analysis reveals that the Forster energy transfer is responsible for the shape of the PL peak. For the sample with PbSe QDs in a small radius of 5.2 nm, a pronounced Stokes shift of 70 meV was found, and the Huang–Rhys factor was calculated to be 2.1.
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