Strong low-temperature anti-Stokes photoluminescence from coupled silicon nanocrystals

J Diener, D Kovalev, H Heckler, G Polisski, N Kunzner, F Koch, A L Efros, M Rosen

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We report efficient low-temperature anti-Stokes photoluminescence (upconverted photoluminescence= UPL) at resonant excitation of coupled silicon nanocrystals (NCs) in porous silicon (PSi). This photoluminescence is absent in strongly oxidized porous silicon and oxidized silicon nanocrystals. The UPL is a result of resonant excitation of electron-hole (e-h) pairs spatially separated in neighboring crystals with different band-gap. II is generated by the excitation of a second e-h pair in the larger of the two crystals and Anger ejection of a carrier into the smaller one, with the larger band-gap. (C) 2001 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalOptical Materials
Volume17 Jun-Jul
Issue number1-2
Publication statusPublished - 2001

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