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p-State luminescence in CdSe nanoplatelets : role of lateral confinement and a longitudinal optical phonon bottleneck

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Abstract
We evidence excited state emission from p states well below ground state saturation in CdSe nanoplatelets. Size-dependent exciton ground and excited state energies and population dynamics are determined by four independent methods: time-resolved PL, time-integrated PL, rate equation modeling, and Hartree renormalized k center dot p calculations-all in very good agreement. The ground state-excited state energy spacing strongly increases with the lateral platelet quantization. Depending on its detuning to the LO phonon energy, the PL decay of CdSe platelets is governed by a size tunable LO phonon bottleneck, related to the low exciton-phonon coupling, very large oscillator strength, and energy spacing of both states. This is, for instance, ideal to tune lasing properties. CdSe platelets are perfectly suited to control the exciton-phonon interaction by changing their lateral size while the optical transition energy is determined by their thickness.
Keywords
COLLOIDAL QUANTUM DOTS, ELECTRONIC-STRUCTURE, ZINCBLENDE CDSE, WELLS, SIZE, SEMICONDUCTORS, ABSORPTION

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Chicago
Achtstein, Alexander W, Riccardo Scott, Sebastian Kickhöfel, Stefan T Jagsch, Sotirios Christodoulou, Guillaume HV Bertrand, Anatol V Prudnikau, et al. 2016. “p-State Luminescence in CdSe Nanoplatelets : Role of Lateral Confinement and a Longitudinal Optical Phonon Bottleneck.” Physical Review Letters 116 (11).
APA
Achtstein, A. W., Scott, R., Kickhöfel, S., Jagsch, S. T., Christodoulou, S., Bertrand, G. H., Prudnikau, A. V., et al. (2016). p-State luminescence in CdSe nanoplatelets : role of lateral confinement and a longitudinal optical phonon bottleneck. PHYSICAL REVIEW LETTERS, 116(11).
Vancouver
1.
Achtstein AW, Scott R, Kickhöfel S, Jagsch ST, Christodoulou S, Bertrand GH, et al. p-State luminescence in CdSe nanoplatelets : role of lateral confinement and a longitudinal optical phonon bottleneck. PHYSICAL REVIEW LETTERS. 2016;116(11).
MLA
Achtstein, Alexander W, Riccardo Scott, Sebastian Kickhöfel, et al. “p-State Luminescence in CdSe Nanoplatelets : Role of Lateral Confinement and a Longitudinal Optical Phonon Bottleneck.” PHYSICAL REVIEW LETTERS 116.11 (2016): n. pag. Print.
@article{8538147,
  abstract     = {We evidence excited state emission from p states well below ground state saturation in CdSe nanoplatelets. Size-dependent exciton ground and excited state energies and population dynamics are determined by four independent methods: time-resolved PL, time-integrated PL, rate equation modeling, and Hartree renormalized k center dot p calculations-all in very good agreement. The ground state-excited state energy spacing strongly increases with the lateral platelet quantization. Depending on its detuning to the LO phonon energy, the PL decay of CdSe platelets is governed by a size tunable LO phonon bottleneck, related to the low exciton-phonon coupling, very large oscillator strength, and energy spacing of both states. This is, for instance, ideal to tune lasing properties. CdSe platelets are perfectly suited to control the exciton-phonon interaction by changing their lateral size while the optical transition energy is determined by their thickness.},
  articleno    = {116802},
  author       = {Achtstein, Alexander W and Scott, Riccardo and Kickh{\"o}fel, Sebastian and Jagsch, Stefan T and Christodoulou, Sotirios and Bertrand, Guillaume HV and Prudnikau, Anatol V and Antanovich, Artsiom and Artemyev, Mikhail and Moreels, Iwan and Schliwa, Andrei and Woggon, Ulrike},
  issn         = {0031-9007},
  journal      = {PHYSICAL REVIEW LETTERS},
  language     = {eng},
  number       = {11},
  pages        = {5},
  title        = {p-State luminescence in CdSe nanoplatelets : role of lateral confinement and a longitudinal optical phonon bottleneck},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.116.116802},
  volume       = {116},
  year         = {2016},
}

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