Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
A high‐efficiency blue‐emitting organic light‐emitting diode (OLED) approaching theoretical efficiency using an exciplex‐forming co‐host composed of N,N′‐dicarbazolyl‐3,5‐benzene (mCP) and bis‐4,6‐(3,5‐di‐3‐pyridylphenyl)‐ 2‐methylpyrimidine (B3PYMPM) is fabricated. Iridium(III)bis[(4,6‐difluorophenyl)‐ pyridinato‐N,C2′]picolinate (FIrpic) is used as the emitter, which turns out to have a preferred horizontal dipole orientation in the emitting layer. The OLED shows a maximum external quantum efficiency of 29.5% (a maximum current efficiency of 62.2 cd A−1), which is in perfect agreement with the theoretical prediction.