Multifunctional deep-blue emitter comprising an anthracene core and terminal triphenylphosphine oxide groups
Journal
Advanced Functional Materials
Journal Volume
19
Journal Issue
4
Pages
560-566
Date Issued
2009
Author(s)
Abstract
A highly efficient blue-light emitter, 2-tert-butyl-9,10-bis[4′- (diphenylphosphoryl)phenyl]anthracene (POAn) is synthesized, and comprises electron-deficient triphenylphosphine oxide side groups appended to the 9- and 10-positions of a 2-tert-butylanthracene core. This sophisticated anthracene compound possesses a non-coplanar configuration that results in a decreased tendency to crystallize and weaker intermolecular interactions in the solid state, leading to its pronounced morphological stability and high quantum efficiency. In addition to serving as an electron-transporting blue-light-emitting material, POAn also facilitates electron injection from the Al cathode to itself. Consequently, simple double-layer devices incorporating POAn as the emitting, electron-transporting, and -injecting material produce bright deep-blue lights having Commission Internationale de L'Eclairage coordinates of (0.15,0.07). The peak electroluminescence performance was 4.3% (2.9 cd A-1). For a device lacking an electron-transport layer or alkali fluoride, this device displays the best performance of any such the deep-blue organic light-emitting diodes reported to date. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.
Type
journal article