Vacuum-deposited films of meso-2,4-di(N-carbazolyl)pentane in situ fluorescence observation of the deposition process and fluorescence and morphological characteristics of the films

Nobuaki Tai, Akira Itaya*, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The deposition processes of meso-2,4-di(N-carbazolyl)pentane have been investigated by measuring in situ fluorescence spectra during deposition on hydrophilic and hydrophobic quartz substrates. Excimer fluorescence was observed at the initial stage of deposition, and its intensity ratio to monomer fluorescence changed with the progress of deposition, depending upon the nature of the substrate and the temperature. Polarizing, optical and fluorescence microscopies of deposited films were carried out after taking the samples out of the deposition chamber. The deposited molecules formed aggregates on the substrates which were initially spherical but which changed to a fractal-like shape after having been stored for 1 month. The initial aggregates were amorphous, but the fractal aggregates were crystalline. This behaviour is discussed in terms of interactions between the substrate and the compound.

Original languageEnglish
Pages (from-to)891-902
Number of pages12
JournalJournal of Materials Chemistry
Volume2
Issue number9
DOIs
StatePublished - 1 Dec 1992

Keywords

  • Excimer
  • Fluorescence spectroscopy
  • Meso-2,4-di(n-carbazolyl)pentane
  • Vacuum deposition

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