In this study, a new cathode system of triazole (TAZ)/Cs2CO3/Al has been proposed. Obvious efficiency improvement and sharp enhanced electron injection were maintained in the devices with this new cathode. TAZ owns deep the highest occupied molecular orbital (HOMO) and wide band gap, so as to block the hole leakage effectively and confine the exciton in Alq₃ emissive layer. An abrupt lowering of the vacuum level was found in the mixture of TAZ and Cs₂CO₃, which indicated that the electron injection barrier from metal cathode into Alq₃ was greatly reduced. Our experimental proved that this new cathode may have a wide application in OLEDs emitting light with short wavelength.

Date Published: 12 October 2009
PDF: 8 pages
Proc. SPIE 7518, Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies, 75180I (12 October 2009); doi: 10.1117/12.843547

Published in SPIE Proceedings Vol. 7518:
Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies
Michael Grätzel; Hiroshi Amano; Chin Hsin Chen; Changqing Chen; Peng Wang, Editor(s)