title: p-State Luminescence in CdSe Nanoplatelets: Role of Lateral Confinement and a Longitudinal Optical Phonon Bottleneck.
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·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.
authors.affiliation: Institute of Optics and Atomic Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Alexander W
authors.initials: AW
authors.lastname: Achtstein
authors.affiliation: Institute of Optics and Atomic Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Scott
authors.affiliation: Institute of Optics and Atomic Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Kickhöfel
authors.affiliation: Institute of Solid State Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Stefan T
authors.initials: ST
authors.lastname: Jagsch
authors.affiliation: Department of Physics, University of Genoa, via Dodecaneso 33, IT-16146 Genova, Italy.|Istituto Italiano di Tecnologia, Via Morego 30, IT-16163 Genova, Italy.
authors.forename: Sotirios
authors.initials: S
authors.lastname: Christodoulou
authors.affiliation: Istituto Italiano di Tecnologia, Via Morego 30, IT-16163 Genova, Italy.
authors.forename: Guillaume H V
authors.initials: GH
authors.lastname: Bertrand
authors.affiliation: Institute for Physico-Chemical Problems, Belarusian State University, 220030 Minsk, Belarus.
authors.forename: Anatol V
authors.initials: AV
authors.lastname: Prudnikau
authors.affiliation: Institute for Physico-Chemical Problems, Belarusian State University, 220030 Minsk, Belarus.
authors.forename: Artsiom
authors.initials: A
authors.lastname: Antanovich
authors.affiliation: Institute for Physico-Chemical Problems, Belarusian State University, 220030 Minsk, Belarus.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Artemyev
authors.affiliation: Istituto Italiano di Tecnologia, Via Morego 30, IT-16163 Genova, Italy.
authors.forename: Iwan
authors.initials: I
authors.lastname: Moreels
authors.affiliation: Institute of Solid State Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Andrei
authors.initials: A
authors.lastname: Schliwa
authors.affiliation: Institute of Optics and Atomic Physics, Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Ulrike
authors.initials: U
authors.lastname: Woggon