Small-Sized PbSe/PbS Core/Shell Colloidal Quantum Dots
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- 作者：Diana Yanover ; Richard K. 膶apek ; Anna Rubin-Brusilovski ; Roman Vaxenburg ; Nathan Grumbach ; Georgy I. Maikov ; Olga Solomeshch ; Aldona Sashchiuk ; Efrat Lifshitz
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：November 27, 2012
- 年：2012
- 卷：24
- 期：22
- 页码：4417-4423
- 全文大小：353K
- 年卷期：v.24,no.22(November 27, 2012)
- ISSN：1520-5002
文摘
The work focuses on the synthesis of small-sized PbSe/PbS core/shell colloidal quantum dots with the core diameter of 2鈥?.5 nm and the shell thickness of 0.5鈥?.0 nm. The PbSe/PbS core/shell CQDs are chemically stable under time-limited air exposure and have emission quantum efficiency of 60% at room temperature. The PbSe/PbS core/shell CQDs have a tunable absorption edge around 1 渭m, large exciton emission Stokes shift (150 meV), and small exchange interaction (1.5 meV). Theoretical calculations associate the mentioned parameters to the small-size regime as well as to a lift of band-edge degeneracy due to slight shape anisotropy. The specific parameters are of special interest in photovoltaic applications.