Direct observation of back energy transfer in blue phosphorescent materials for organic light emitting diodes by time-resolved optical waveguide spectroscopy

H. Hirayama, Y. Sugawara, Y. Miyashita, M. Mitsuishi, T. Miyashita

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We demonstrate a high-sensitive transient absorption technique for detection of excited states in an organic thin film by time-resolved optical waveguide spectroscopy. By using a laser beam as a probe light, we detect small change in the transient absorbance which is equivalent to 10-7 absorbance unit in a conventional method. This technique was applied to organic thin films of blue phosphorescent materials for organic light emitting diodes. We directly observed the back energy transfer from emitting guest molecules to conductive host molecules.

Original languageEnglish
Article number081124
JournalApplied Physics Letters
Volume102
Issue number8
DOIs
Publication statusPublished - 2013 Feb 25

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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