Red to green rainbow photoluminescence from unoxidized silicon nanocrystallites

Zain Yamani, Sahel Ashhab, Amman Nayfeh, W. Howard Thompson, Munir Nayfeh

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We prepared luminescent silicon by incorporating H2O2 in the anodizing process. Under UV excitation, our samples appear reddish, orangish, yellowish to greenish as the electrolyte-air interface at the meniscus is approached. Under high current anodization, the emission becomes broad but unstable. The time characteristics of all the emission regions are in the range of 1-10 μs. The results are consistent with a significant reduction of crystallite sizes, and may be explained via novel Si - Si dimer surface states that are induced by quantum confinement.

Original languageEnglish
Pages (from-to)3929-3931
Number of pages3
JournalJournal of Applied Physics
Issue number7
Publication statusPublished - 1 Jan 1998


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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