Thermally Activated Photoluminescence in Lead Selenide Colloidal Quantum Dots

被引:61
作者
Kigel, Ariel [1 ,2 ]
Brumer, Maya [1 ,2 ]
Maikov, Georgy I. [1 ,2 ]
Sashchiuk, Aldona [1 ,2 ]
Lifshitz, Efrat [1 ,2 ]
机构
[1] Technion Israel Inst Technol, Inst Solid State, Schulich Fac Chem, IL-32000 Haifa, Israel
[2] Technion Israel Inst Technol, Russell Berrie Nanotechnol Inst, IL-32000 Haifa, Israel
基金
以色列科学基金会;
关键词
colloids; excitons; photoluminescence; quantum dots; solvent effects; TEMPERATURE-DEPENDENCE; PBSE NANOCRYSTALS; PBSE/PBSEXS1-X CORE/SHELL; ELECTRONIC-STRUCTURE; RAMAN-SCATTERING; ENERGY-GAP; CORE; SOLIDS; WELLS; TIME;
D O I
10.1002/smll.200801378
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The thermal activation processes in PbSe colloidal quantum dots and their influence on the ground-state exciton emission are discussed. Activation of a dark exciton occurs at 1.4-7 K, assisted by an acoustic phonon coupling. Activation of a bright exciton occurs at 100-200 K, which appears as a sudden change in the photoluminescence band intensity, energy, and full width at half maximum. This activation overcomes the dark-bright-state splitting, when the activation temperature increases with the decrease of the dots' size. The dark exciton lifetime if found to be approximate to 6-12 mu s at 1.4 K, while the bright exciton lifetime at 300 K evaluated as 450 its varies slightly with the change in the size of the dots. In addition, the emission quantum yield of these dots, measured at a variety of temperatures when dissolved in various solvents, reveals information about the influence of the environment on the recombination processes.
引用
收藏
页码:1675 / 1681
页数:7
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