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Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots

Chen, Junsheng LU ; Zidek, Karel LU ; Chábera, Pavel LU ; Liu, Dongzhou; Cheng, Pengfei; Nuuttila, Lauri; Al-Marri, Mohammed J.; Lehtivuori, Heli; Messing, Maria E. LU and Han, Keli, et al. (2017) In Journal of Physical Chemistry Letters 8(10). p.2316-2321
Abstract

All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr3 QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained... (More)

All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr3 QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained power-law dependence suggests that the TPA process through a virtual state populates exciton band states. The revealed power-law dependence and the understanding of TPA process are important for developing high performance nonlinear optical devices based on CsPbBr3 nanocrystals.

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Journal of Physical Chemistry Letters
volume
8
issue
10
pages
6 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85019354037
  • wos:000402026500037
ISSN
1948-7185
DOI
10.1021/acs.jpclett.7b00613
language
English
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yes
id
bf284669-3e16-49f2-9604-470b380357f6
date added to LUP
2017-06-28 09:44:39
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2017-09-18 11:43:23
@article{bf284669-3e16-49f2-9604-470b380357f6,
  abstract     = {<p>All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr<sub>3</sub> QDs have also been demonstrated as stable two-photon-pumped lasing medium. However, the reported two photon absorption (TPA) cross sections for these QDs differ by an order of magnitude. Here we present an in-depth study of the TPA properties of CsPbBr<sub>3</sub> QDs with mean size ranging from 4.6 to 11.4 nm. By using femtosecond transient absorption (TA) spectroscopy we found that TPA cross section is proportional to the linear one photon absorption. The TPA cross section follows a power law dependence on QDs size with exponent 3.3 ± 0.2. The empirically obtained power-law dependence suggests that the TPA process through a virtual state populates exciton band states. The revealed power-law dependence and the understanding of TPA process are important for developing high performance nonlinear optical devices based on CsPbBr<sub>3</sub> nanocrystals.</p>},
  author       = {Chen, Junsheng and Zidek, Karel and Chábera, Pavel and Liu, Dongzhou and Cheng, Pengfei and Nuuttila, Lauri and Al-Marri, Mohammed J. and Lehtivuori, Heli and Messing, Maria E. and Han, Keli and Zheng, Kaibo and Pullerits, Tõnu},
  issn         = {1948-7185},
  language     = {eng},
  month        = {05},
  number       = {10},
  pages        = {2316--2321},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry Letters},
  title        = {Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr<sub>3</sub> Perovskite Quantum Dots},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.7b00613},
  volume       = {8},
  year         = {2017},
}