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

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 absorbance unit...

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Bibliographic Details
Published inApplied physics letters Vol. 102; no. 8; p. 81124
Main Authors Hirayama, H, Sugawara, Y, Miyashita, Y, Mitsuishi, M, Miyashita, T
Format Journal Article
LanguageEnglish
Published United States 25.02.2013
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Summary: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 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 from emitting guest molecules to conductive host molecules.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4792838