title: Efficient blue organic light-emitting diodes with graded hole-transport layers.
abstract: Using a derivative of the blue-emitting polyfluorene (see the graph for the output spectrum and the inset picture for the color), efficient devices exhibiting a power efficiency close to 2.7 cd A(-1) at 100 cd m(-2) light output were realized.
authors.affiliation: Department Chemie Lehrbereich Physikalische Chemie Ludwig-Maximilians-Universität München Butenandtstrasse 11, 81377 München, Germany.
authors.forename: D C
authors.initials: DC
authors.lastname: Müller
authors.forename: T
authors.initials: T
authors.lastname: Braig
authors.forename: H G
authors.initials: HG
authors.lastname: Nothofer
authors.forename: M
authors.initials: M
authors.lastname: Arnoldi
authors.forename: M
authors.initials: M
authors.lastname: Gross
authors.forename: U
authors.initials: U
authors.lastname: Scherf
authors.forename: O
authors.initials: O
authors.lastname: Nuyken
authors.forename: K
authors.initials: K
authors.lastname: Meerholz