Room temperature spectral hole burning and elimination of photodarkening in sol-gel derived CdS quantum dots

K. Kang, A. D. Kepner, Y. Z. Hu, S. W. Koch, N. Peyghambarian, C. Y. Li, T. Takada, Y. Kao, J. D. MacKenzie

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Spectral hole burning at room temperature is used as a technique to compare optical nonlinearities of semiconductor quantum dot materials prepared by the sol-gel and glass fusion techniques. In an effort to understand the mechanism of photodarkening in quantum dots and assess its effect on optical nonlinearities, we prepared and characterized three representative samples with similar dot sizes. We found that photodarkening can be reduced substantially by controlling the media surrounding the dots. The sol-gel derived samples with 80 wt % SiO2 do not exhibit appreciable photodarkening while the melt-quenched glasses with 56 wt % SiO2 exhibit strong photodarkening effects at room temperature which results in reduction of their optical nonlinearity by a factor of ≅20 compared with the sol-gel derived samples.

Original languageEnglish (US)
Pages (from-to)1487-1489
Number of pages3
JournalApplied Physics Letters
Volume64
Issue number12
DOIs
StatePublished - Dec 1 1994

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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