Interplay between optical gain and photoinduced absorption in CdSe nanocrystals

A. V. Malko, A. A. Mikhailovsky, M. A. Petruska, J. A. Hollingsworth, V. I. Klimov

Research output: Contribution to journalArticle

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Abstract

A potential complication associated with the realization of the optical-gain regime in semiconductor nanocrystals (NCs) arises from the competing phenomenon of excited-state absorption. Here, we apply an ultrafast transient absorption technique to study the competition between optical gain and excited-state (photoinduced) absorption in CdSe NCs as a function of NC size, surface passivation, and solvent/matrix identity. We observe that for NCs prepared in such a commonly used solvent as hexane, the contribution from photoinduced absorption rapidly increases with decreasing NC radius, and it completely suppresses optical gain in NCs of small sizes. Further, the magnitude of photoinduced absorption is sensitive both to the type and the quality of surface passivation, as well as to the identity of the solvent/matrix material. These observations, along with a strong size dependence, indicate that photoinduced absorption interfering with optical gain is not intrinsic to CdSe NCs but, instead, results from the involvement of NC interface states/processes.

Original languageEnglish
Pages (from-to)5250-5255
Number of pages6
JournalJournal of Physical Chemistry B
Volume108
Issue number17
Publication statusPublished - Apr 29 2004

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Optical gain
Nanocrystals
nanocrystals
Excited states
Passivation
passivity
matrix materials
Interface states
Hexanes
Hexane
excitation
Semiconductor materials
radii
matrices

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Malko, A. V., Mikhailovsky, A. A., Petruska, M. A., Hollingsworth, J. A., & Klimov, V. I. (2004). Interplay between optical gain and photoinduced absorption in CdSe nanocrystals. Journal of Physical Chemistry B, 108(17), 5250-5255.

Interplay between optical gain and photoinduced absorption in CdSe nanocrystals. / Malko, A. V.; Mikhailovsky, A. A.; Petruska, M. A.; Hollingsworth, J. A.; Klimov, V. I.

In: Journal of Physical Chemistry B, Vol. 108, No. 17, 29.04.2004, p. 5250-5255.

Research output: Contribution to journalArticle

Malko, AV, Mikhailovsky, AA, Petruska, MA, Hollingsworth, JA & Klimov, VI 2004, 'Interplay between optical gain and photoinduced absorption in CdSe nanocrystals', Journal of Physical Chemistry B, vol. 108, no. 17, pp. 5250-5255.
Malko AV, Mikhailovsky AA, Petruska MA, Hollingsworth JA, Klimov VI. Interplay between optical gain and photoinduced absorption in CdSe nanocrystals. Journal of Physical Chemistry B. 2004 Apr 29;108(17):5250-5255.
Malko, A. V. ; Mikhailovsky, A. A. ; Petruska, M. A. ; Hollingsworth, J. A. ; Klimov, V. I. / Interplay between optical gain and photoinduced absorption in CdSe nanocrystals. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 17. pp. 5250-5255.
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