Synthesis and luminescence of silicon remnants formed by truncated glassmelt-particle reaction

Subhash H. Risbud, Li-Chi Liu, James F. Shackelford

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Abstract

We have obtained nanometer sized silicon remnants sequestered in glass matrices by terminating the reaction of pure silicon powders dispersed in the viscous melt at a temperature of 1400°C. Repeated use of this truncated melt-particle reaction process dilutes the amount and size of silicon remnants, and bulk samples containing nanosize silicon crystallites embedded in a glass matrix were eventually obtained. These quantum dot sized silicon-in-glass materials emit greenish luminescence with peak wavelengths from ≊480 to 530 nm, considerably shorter than the reddish luminescence (at about 700-850 nm) observed in porous silicon structures prepared by electrochemical etching techniques; upon complete digestion of Si particles by the melt, the luminescence peaks disappear. Since our silicon-in-glass preparation method does not involve etching, the origin of the luminescence is not likely to be due to Si-O-H compounds (e.g., siloxene) postulated recently. The location of the luminescence peaks and the observed silicon crystallite size suggest quantum confinement leading to a widened silicon band gap arising from remnants in the glass matrix smaller than the exciton diameter of bulk silicon (10 nm).

Original languageEnglish
Pages (from-to)1648-1650
Number of pages3
JournalApplied Physics Letters
Volume63
Issue number12
DOIs
Publication statusPublished - 1993 Dec 1

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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