Light amplification using inverted core/shell nanocrystals: Towards lasing in the single-exciton regime

Sergei A. Ivanov, Jagjit Nanda, Andrei Piryatinski, Marc Achermann, Laurent P. Balet, Ilia V. Bezel, Polina O. Anikeeva, Sergei Tretiak, Victor I Klimov

Research output: Contribution to journalArticle

151 Citations (Scopus)

Abstract

Size-controlled spectral tunability and chemical flexibility make semiconductor nanocrystals (NCs) attractive as nanoscale building blocks for color-selectable optical-gain media. The technological potential of NCs as lasing materials is, however, significantly diminished by highly efficient nonradiative Auger recombination of multiexcitons leading to ultrafast decay of optical gain. Here we explore a novel approach to achieve NC lasing in the Auger-recombination-free regime by using type II NC heterostructures that promote spatial separation of electrons and holes. We show that such hetero-NCs can exhibit strong repulsive exciton-exciton interactions that lead to significantly reduced excited-state absorption associated with NCs containing single electron-hole pairs. This effect leads to reduced optical-gain thresholds and can potentially allow lasing in the single-exciton regime, for which Auger recombination is inactive. We use these novel hetero-NCs to demonstrate efficient amplified spontaneous emission (ASE) that is tunable across a "difficult" range of green and blue colors. The ASE in the blue range has never been previously achieved using traditional NCs with type I carrier localization.

Original languageEnglish
Pages (from-to)10625-10630
Number of pages6
JournalJournal of Physical Chemistry B
Volume108
Issue number30
DOIs
Publication statusPublished - Jul 29 2004

Fingerprint

Excitons
Nanocrystals
Amplification
lasing
nanocrystals
excitons
Optical gain
Spontaneous emission
spontaneous emission
Color
color
LDS 751
Electrons
Beam plasma interactions
Excited states
Heterojunctions
flexibility
Semiconductor materials
thresholds
decay

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Light amplification using inverted core/shell nanocrystals : Towards lasing in the single-exciton regime. / Ivanov, Sergei A.; Nanda, Jagjit; Piryatinski, Andrei; Achermann, Marc; Balet, Laurent P.; Bezel, Ilia V.; Anikeeva, Polina O.; Tretiak, Sergei; Klimov, Victor I.

In: Journal of Physical Chemistry B, Vol. 108, No. 30, 29.07.2004, p. 10625-10630.

Research output: Contribution to journalArticle

Ivanov, SA, Nanda, J, Piryatinski, A, Achermann, M, Balet, LP, Bezel, IV, Anikeeva, PO, Tretiak, S & Klimov, VI 2004, 'Light amplification using inverted core/shell nanocrystals: Towards lasing in the single-exciton regime', Journal of Physical Chemistry B, vol. 108, no. 30, pp. 10625-10630. https://doi.org/10.1021/jp0483371
Ivanov, Sergei A. ; Nanda, Jagjit ; Piryatinski, Andrei ; Achermann, Marc ; Balet, Laurent P. ; Bezel, Ilia V. ; Anikeeva, Polina O. ; Tretiak, Sergei ; Klimov, Victor I. / Light amplification using inverted core/shell nanocrystals : Towards lasing in the single-exciton regime. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 30. pp. 10625-10630.
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