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Interband and Intraband Optical Studies of PbSe Colloidal Quantum Dots
Abstract
PbSe nanocrystal colloids exhibit a well-defined excitonic structure with the lowest energy exciton tuning from 0.5 to 1 eV, as a function of size. Band-edge fluorescence is observed from 1.2 to 2 μm with a small Stokes shift, sub-μs lifetime, and near-unity quantum yield. Upon pumping at 1.064 μm, the first exciton decay is consistent with radiative relaxation at low pump intensity and with Auger recombination at higher pump intensities. Optically induced absorption is observed at approximately midgap. These transitions exhibit strengths similar to the interband exciton and are size-tunable. They are assigned to the 1S e,h −1P e,h and 1P e,h −1D e,h intraband excitations. Intraband pump−probe measurements of the 1S e,h −1P e,h transition reveal a short lifetime and the absence of the phonon bottleneck.
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Cited by
Chemistry and Properties of Nanocrystals of Different Shapes
Burda, C., Chen, X., Narayanan, R., & El-Sayed, M. A. (2005) · Chemical Reviews · doi:10.1021/cr030063a · Cited by 7,230
Welsher, K., Sherlock, S. P., & Dai, H. (2011) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1014501108 · Cited by 958
de Mello Donegá, C., Liljeroth, P., & Vanmaekelbergh, D. (2005) · Small · doi:10.1002/smll.200500239 · Cited by 511
Tunable Near-Infrared Optical Gain and Amplified Spontaneous Emission Using PbSe Nanocrystals
Schaller, R. D., Petruska, M. A., & Klimov, V. I. (2003) · The Journal of Physical Chemistry B · doi:10.1021/jp0311660 · Cited by 321
Metadata
- Authors
- Wehrenberg, B. L., Wang, C., & Guyot-Sionnest, P.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-09-24
- Volume
- 106
- Issue
- 41
- Pages
- 10634-10640
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2002296412
- Cited by
- 654
- References
- 0
- FWCI
- 17.55
- Type
- journal article
- Language
- en
- Open access
- closed
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