Phase transitions in thermally annealed films of Alq 3

G. Baldacchini, P. Chiacchiaretta, R.B. Pode, M.A. Vincenti, Q.-M. Wang

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Abstract

Organic light emitting devices have been so very much improved lately that they are being widely applied for displays and lighting. Among many improving technologies, annealing processes in different atmospheres affect greatly their performance, for instance when the active material is the small molecule Alq 3. In particular, a significant increase of the photoluminescence is observed in thin films of this molecule between 150 and 180 °C, before the physical destruction of the films occurs at higher temperatures. This phenomenon is attributed to a phase transition towards a novel morphological aggregation of the molecules in the film, which proved to be a much improved optical material for luminescent applications, and which seems common to other molecules as well. © 2012 G. Baldacchini, P. Chiacchiaretta, R.B. Pode, M.A. Vincenti, and Q.-M. Wang.
Original languageEnglish
Pages (from-to)985 - 992
Number of pages8
JournalLow Temperature Physics
Volume38
Issue number8
Publication statusPublished - Aug 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Baldacchini, G., Chiacchiaretta, P., Pode, R. B., Vincenti, M. A., & Wang, Q-M. (2012). Phase transitions in thermally annealed films of Alq 3. Low Temperature Physics, 38(8), 985 - 992.