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Band-edge exciton fine structure and recombination dynamics in InP/ZnS colloidal nanocrystals

(2016) ACS NANO. 10(3). p.3356-3364
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Center for nano- and biophotonics (NB-Photonics)
Abstract
We report on a temperature-, time-, and spectrally resolved study of the photoluminescence of type-I InP/ZnS colloidal nanocrystals with varying core size. By studying the exciton recombination dynamics we assess the exciton fine structure in these systems. In addition to the typical bright-dark doublet, the photoluminescence stems from an upper bright state in spite of its large energy splitting (similar to 400 meV). This striking observation results from dramatically lengthened thermalization processes among the fine structure levels and points to optical-phonon bottleneck effects in InP/ZnS nanocrystals. Furthermore, our data show that the radiative recombination of the dark exciton scales linearly with the bright -dark energy splitting for CdSe and InP nanocrystals. This finding strongly suggests a universal dangling bonds-assisted recombination of the dark exciton in colloidal nanostructures.
Keywords
fine structure, Cd-free, dark exciton, dangling bonds, phonon bottleneck, INP QUANTUM DOTS, CDSE NANOCRYSTALS, SEMICONDUCTOR NANOCRYSTALS, EMISSION, BRIGHT, NANOSTRUCTURES, NANOPLATELETS, ABSORPTION, DEPENDENCE, STATES

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Citation

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MLA
Biadala, Louis, et al. “Band-Edge Exciton Fine Structure and Recombination Dynamics in InP/ZnS Colloidal Nanocrystals.” ACS NANO, vol. 10, no. 3, 2016, pp. 3356–64.
APA
Biadala, L., Siebers, B., Beyazit, Y., Tessier, M., Dupont, D., Hens, Z., … Bayer, M. (2016). Band-edge exciton fine structure and recombination dynamics in InP/ZnS colloidal nanocrystals. ACS NANO, 10(3), 3356–3364.
Chicago author-date
Biadala, Louis, Benjamin Siebers, Yasin Beyazit, Mickaël Tessier, Dorian Dupont, Zeger Hens, Dmitri R Yakovlev, and Manfred Bayer. 2016. “Band-Edge Exciton Fine Structure and Recombination Dynamics in InP/ZnS Colloidal Nanocrystals.” ACS NANO 10 (3): 3356–64.
Chicago author-date (all authors)
Biadala, Louis, Benjamin Siebers, Yasin Beyazit, Mickaël Tessier, Dorian Dupont, Zeger Hens, Dmitri R Yakovlev, and Manfred Bayer. 2016. “Band-Edge Exciton Fine Structure and Recombination Dynamics in InP/ZnS Colloidal Nanocrystals.” ACS NANO 10 (3): 3356–3364.
Vancouver
1.
Biadala L, Siebers B, Beyazit Y, Tessier M, Dupont D, Hens Z, et al. Band-edge exciton fine structure and recombination dynamics in InP/ZnS colloidal nanocrystals. ACS NANO. 2016;10(3):3356–64.
IEEE
[1]
L. Biadala et al., “Band-edge exciton fine structure and recombination dynamics in InP/ZnS colloidal nanocrystals,” ACS NANO, vol. 10, no. 3, pp. 3356–3364, 2016.
@article{7242133,
  abstract     = {We report on a temperature-, time-, and spectrally resolved study of the photoluminescence of type-I InP/ZnS colloidal nanocrystals with varying core size. By studying the exciton recombination dynamics we assess the exciton fine structure in these systems. In addition to the typical bright-dark doublet, the photoluminescence stems from an upper bright state in spite of its large energy splitting (similar to 400 meV). This striking observation results from dramatically lengthened thermalization processes among the fine structure levels and points to optical-phonon bottleneck effects in InP/ZnS nanocrystals. Furthermore, our data show that the radiative recombination of the dark exciton scales linearly with the bright -dark energy splitting for CdSe and InP nanocrystals. This finding strongly suggests a universal dangling bonds-assisted recombination of the dark exciton in colloidal nanostructures.},
  author       = {Biadala, Louis and Siebers, Benjamin and Beyazit, Yasin and Tessier, Mickaël and Dupont, Dorian and Hens, Zeger and Yakovlev, Dmitri R and Bayer, Manfred},
  issn         = {1936-0851},
  journal      = {ACS NANO},
  keywords     = {fine structure,Cd-free,dark exciton,dangling bonds,phonon bottleneck,INP QUANTUM DOTS,CDSE NANOCRYSTALS,SEMICONDUCTOR NANOCRYSTALS,EMISSION,BRIGHT,NANOSTRUCTURES,NANOPLATELETS,ABSORPTION,DEPENDENCE,STATES},
  language     = {eng},
  number       = {3},
  pages        = {3356--3364},
  title        = {Band-edge exciton fine structure and recombination dynamics in InP/ZnS colloidal nanocrystals},
  url          = {http://dx.doi.org/10.1021/acsnano.5b07065},
  volume       = {10},
  year         = {2016},
}

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