Quantum Dots in Glasses: Size-Dependent Stokes Shift by Lead Chalcogenide

被引：35

作者：

Han, Na ^{[1
]}

Liu, Chao ^{[1
]}

Zhao, Zhiyong ^{[1
]}

Zhang, Jihong ^{[1
]}

Xie, Jun ^{[1
]}

Han, Jianjun ^{[1
]}

Zhao, Xiujian ^{[1
]}

Jiang, Yang ^{[2
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, 122 Luoshi Rd, Wuhan 430070, Peoples R China

[2] China Bldg Mat Inst Solar Energy Applicat, Zhenjiang 212009, Jiangsu, Peoples R China

来源：

INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE | 2015年 / 6卷 / 04期

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

PBS NANOCRYSTALS; OPTICAL GAIN; PHOTOLUMINESCENCE; LUMINESCENCE; EMISSION; EXCHANGE; STATES;

D O I：

10.1111/ijag.12138

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Size-dependent Stokes shift of PbS quantum dots (QDs) formed in the glasses was investigated. PbS QDs with diameters of 3.5 nm to 13.3 nm were precipitated in silicate glasses with different S/Pb ratios using the conventional thermal treatment method. Absorption and photoluminescence (PL) of PbS QDs were tuned from similar to 0.9 mu m (1.38 eV) to similar to 2.3 mu m (0.54 eV) by adjusting the diameters of PbS QDs from 3.5 nm to 13.3 nm. PL energies of QDs exhibited linear dependence on the absorption energies with a slope of 0.484 for PbS QDs with band gap energies larger than 0.98 eV, and the maximum Stokes shift was found to be 206.2 meV for 3.5 nm-sized PbS QDs. For large PbS QDs with band gap energies smaller than 0.98 eV, Stokes shift was found to be similar to 20 meV or smaller. The size-dependent Stokes shift indicated that surface defects made the main contribution and relative energy positions of these surface defects were strongly dependent on the size of PbS QDs.

引用

页码：339 / 344

页数：6

共 25 条

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