Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons

Y Chao, S Krishnamurthy, M Montalti, LH Lie, A Houlton, BR Horrocks, Lisbeth Kjeldgaard, VR Dhanak, MRC Hunt, L Siller

Research output: Contribution to journalArticlepeer-review

35 Citations (SciVal)

Abstract

Alkyl-modified silicon nanocrystallites are efficient fluorophores which are of interest for fundamental spectroscopic studies and as luminescent probes in biology because of their stability in aqueous media. In this work we have investigated these particles using scanning tunneling microscopy, synchrotron-radiation excited photoemission, and x-ray excited optical luminescence (XEOL). During the course of illumination with 145-eV photons we have monitored the evolution of the Si2p core level and, in samples which have suffered prolonged atmospheric exposure, observed in real time the growth of an extra Si2p component attributed to in situ photoinduced oxidation of the Si nanocrystallites. XEOL reveals that two emission bands are active upon soft-x-ray photon excitation and that photoluminescence intensity decreases with photon exposure, which is attributed to charge trapping within the film.
Original languageEnglish
JournalApplied Physics Reviews
Volume98
Issue number4
DOIs
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences

Fingerprint

Dive into the research topics of 'Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons'. Together they form a unique fingerprint.

Cite this