title: Direct observation ofback energy transferin blue phosphorescent materials for organic light emitting diodes by time-resolved optical waveguide spectroscopy.
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 10-7absorbance 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 theback energy transferfrom emitting guest molecules to conductive host molecules.
authors.affiliation: Analysis Technology Center, Fujifilm Corporation, 210, Nakanuma, Minamiashigara, Kanagawa, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hirayama
authors.forename: Y
authors.initials: Y
authors.lastname: Sugawara
authors.forename: Y
authors.initials: Y
authors.lastname: Miyashita
authors.forename: M
authors.initials: M
authors.lastname: Mitsuishi
authors.forename: T
authors.initials: T
authors.lastname: Miyashita