Room temperature optical gain in sol-gel derived CdS quantum dots

J. Butty, N. Peyghambarian, Y. H. Kao, J. D. Mackenzie

Research output: Contribution to journalArticle

99 Scopus citations

Abstract

Under strong nanosecond excitation, we demonstrate that II-VI semiconductor quantum dots exhibit optical gain up to room temperature. The CdS nanocrystallites, fabricated by sol-gel process, are embedded in a sodium borosilicate glass matrix. The gain is spectrally broad and the crossing between absorption and gain is well above the bulk absorption band edge energy, since our nanocrystallites are in the intermediate quantum confinement regime. The gain has a long tail extending to the low energy side of the absorption edge. This tail was shown theoretically to originate from the multiple excited states involved in the recombination between two and one electron-hole pairs.

Original languageEnglish (US)
Pages (from-to)3224-3226
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number21
DOIs
StatePublished - Nov 18 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Room temperature optical gain in sol-gel derived CdS quantum dots'. Together they form a unique fingerprint.

  • Cite this