Upconversion photoluminescence of CdS nanocrystals in polymeric film

Jun He, Gregory D. Scholes, Y. L. Qu, Wei Ji

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We report on nonlinear upconversion photoluminescence (PL) of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion exchange method and highly concentrated in the two layers near the surfaces of a freestanding Nafion film. We observed the differences between the two-photon and one-photon excited PL emissions. The two-photon absorption cross section and quantum yield of CdS NCs were measured with femtosecond laser pulses at 800 nm excitation. The origin of PL, optical nonlinearity, and the figure of merit for optical switching have been discussed.

Original languageEnglish (US)
Article number023110
JournalJournal of Applied Physics
Volume104
Issue number2
DOIs
StatePublished - Aug 12 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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