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N ‐Heterocyclic Carbazole‐Based Hosts for Simplified Single‐Layer Phosphorescent OLEDs with High Efficiencies
Author(s) -
Hudson Zachary M.,
Wang Zhibin,
Helander Michael G.,
Lu ZhengHong,
Wang Suning
Publication year - 2012
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201200927
Subject(s) - oled , carbazole , phosphorescence , materials science , dopant , layer (electronics) , optoelectronics , diode , doping , nanotechnology , photochemistry , optics , fluorescence , chemistry , physics
Highly efficient single‐layer organic light‐emitting diodes (OLEDs) are demonstrated using new N‐ heterocyclic carbazole‐based host materials. Phosphorescent OLEDs with a structure of ITO/MoO 3 /host/host:dopant/host/Cs 2 CO 3 /Al are fabricated in which the new materials act simultaneously as electron‐transport, hole‐transport, and host layer. Devices with maximum current and external quantum efficiencies of 92.2 cd A −1 and 26.8% are achieved, the highest reported to date for a single‐layer OLED.