Optical writing and reading with bilayer assemblies of photosensitive and fluorescent films

Massimiliano Tomasulo, Francisco Raymo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We have identified an efficient photochemical transformation involving the reaction of a [1,3]oxazine with tertiary amines. In aerated acetonitrile, the process is accompanied by the appearance of an intense absorption in the visible region. The irreversible formation of 4-nitrophenolate chromophores is responsible for the development of this band. The photogenerated absorption persists indefinitely upon storage in the dark or even under visible illumination. Furthermore, the process is particularly efficient when the [1,3]oxazine is reacted with triethylamine. The corresponding quantum yield is ca. 0.6. Their photoinduced reaction occurs also in poly(methylmethacrylate) matrices. Once again, the process is accompanied by the appearance of an intense absorption and induces pronounced changes in the refractive index of the dye-polymer composite. The irreversible absorption changes associated with these photosensitive materials can be exploited, in principle at least, to write information optically. The stored data can also be read optically relying on fluorescence measurements. Indeed, we have assembled a bilayer structure consisting of a photosensitive film overlaid on a poly(methylmethacrylate) film doped with naphthalene. The fluorescent dopant in the bottom layer emits light in a wavelength range where only the photogenerated state of the top layer absorbs. Thus, the emission coming from one component can be re-absorbed and filtered only by one of the two states of the other. On the basis of this mechanism, a simple fluorescence measurement can read the state of the photosensitive layer, which can, in turn, be written with an optical stimulation.

Original languageEnglish
Pages (from-to)4354-4360
Number of pages7
JournalJournal of Materials Chemistry
Volume15
Issue number40
DOIs
StatePublished - Oct 28 2005

Fingerprint

Oxazines
Methylmethacrylate
assemblies
Fluorescence
Quantum yield
Naphthalene
Chromophores
Acetonitrile
Amines
Refractive index
Polymers
Coloring Agents
Dyes
Lighting
Doping (additives)
Wavelength
fluorescence
Composite materials
stimulation
naphthalene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Optical writing and reading with bilayer assemblies of photosensitive and fluorescent films. / Tomasulo, Massimiliano; Raymo, Francisco.

In: Journal of Materials Chemistry, Vol. 15, No. 40, 28.10.2005, p. 4354-4360.

Research output: Contribution to journalArticle

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