Near-infrared absorption–emission cross-sections of PbSe quantum dots doped in UV gel
Near-infrared absorption–emission cross-sections of PbSe quantum dots doped in UV gel
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DOI：
10.1016/j.optcom.2015.02.034
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发表时间：
2015-07
影响因子：
2.4
通讯作者：
Cheng Cheng-Cheng;Yinhui Xu;Xiaoyu Cheng
中科院分区：
文献类型：
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作者：
Cheng Cheng-Cheng;Yinhui Xu;Xiaoyu Cheng
我们通过使用吸收光谱法测量掺杂在浓度为0.25-1.50 mg mL− 1的UV凝胶中的三种尺寸（4.5、5.0和5.6 nm）的PbSe量子点（QD）的近红外吸收光谱。提出了一个经验公式来描述第一-第二吸收峰波长与量子点尺寸的关系。5.6 nm量子点的峰值吸收截面为2.76-3.69×10− 16 cm 2，吸收系数范围为0.19-0.59 cm−1，两者都与掺杂浓度和量子点尺寸有关。此外，通过测量量子点的光致发光光谱和使用McCumber关系，这取决于弱的掺杂浓度和量子点的尺寸确定的发射截面。对于5.6 nm量子点，在实验掺杂浓度范围内，测得的峰值发射截面为3.36-4.48×10− 16 cm 2。
We measure near-infrared absorption spectra of PbSe quantum dots (QDs) with three sizes (4.5, 5.0, and 5.6 nm) doped in UV gel with the concentration of 0.25–1.50 mg mL−1by using an absorption-spectrum method. An empirical formula is proposed to describe the correlation of the first–second absorption-peak wavelengths and QD size. The peak-absorption cross-section is measured as 2.76–3.69×10−16cm2for 5.6-nm QD, and the absorption coefficient ranges in 0.19–0.59 cm−1, both associated with the doping concentration and the QD size. Furthermore, the emission cross-sections are determined by measuring the photoluminescence spectra of QDs and using the McCumber relationship, which depend weakly on both the doping concentration and the QD size. For 5.6-nm QD, the measured peak-emission cross-section is 3.36–4.48×10−16cm2within the range of experimental doping concentration.