کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1534033 | 1512576 | 2015 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Near-infrared absorption-emission cross-sections of PbSe quantum dots doped in UV gel
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 mLâ1 by 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 2.76-3.69Ã10â16 cm2 for 5.6-nm QD, and the absorption coefficient ranges in 0.19-0.59 cmâ1, 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 3.36-4.48Ã10â16 cm2 within the range of experimental doping concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 347, 15 July 2015, Pages 108-112
Journal: Optics Communications - Volume 347, 15 July 2015, Pages 108-112
نویسندگان
Cheng Cheng, Yinhui Xu, Xiaoyu Cheng,