Optical microcavities using highly luminescent films of semiconductor nanocrystals

Chris E. Finlayson, David S. Ginger, Neil C. Greenham*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (SciVal)

Abstract

Colloidally grown CdSe nanocrystals with epitaxial ZnS shells show highly efficient, size-tunable luminescence. We report the incorporation of films of these core-shell nanocrystals into wavelength-scale, high-Q, planar microcavities. Under optical excitation, we find that emission from the nanocrystals couples to the discrete optical modes of the microcavity. The broad free-space emission spectrum of the nanocrystals is modified by the presence of the microcavity, giving a series of sharp emission lines with wavelengths determined by the cavity dimension. Our experiments demonstrate that microcavities with semiconductor emitters can be conveniently fabricated using spin-coating techniques. We find that, at room temperature, the microcavity emission spectrum is independent of excitation intensity for excitation densities up to approximately one electron-hole pair per nanocrystal.

Original languageEnglish
Pages (from-to)2500-2502
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number16
DOIs
Publication statusPublished - 16 Oct 2000

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