TITLE

Highly efficient electroluminescent materials based on fluorinated organometallic iridium compounds

AUTHOR(S)
Wang, Y.; Herron, N.; Grushin, V. V.; LeCloux, D.; Petrov, V.
PUB. DATE
July 2001
SOURCE
Applied Physics Letters;7/23/2001, Vol. 79 Issue 4
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report a class of highly efficient electroluminescent materials based on fluorinated iridium compounds. Using aluminum as the cathode, a device, using fac-tris[5-fluoro-2(5-trifluoromethyl-2-pyridinyl)phenyl-C,N]iridium (Ir-2h) as the luminescent layer, displayed intense electroluminescence at 525 nm with an efficiency of 20 cd/A and a maximum radiance of 4800 cd/m2. Differing from the previously reported Ir(ppy)[sub 3], Ir-2h can be used in the undiluted form without the use of a charge-transporting host. This indicates that Ir-2h by itself has good enough charge-transporting properties. Photoluminescence studies at room temperature and 77 K revealed that electroluminescence originates from the metal-to-ligand charge transfer state with a quantum yield of 0.56 for Ir-2h and 0.5 for Ir(ppy)[sub 3] in toluene at room temperature. In the thin-film form, photoluminescence quantum yield of Ir-2h is a factor of 10 greater than that of Ir(ppy)[sub 3] due to the larger self-quenching effect of Ir(ppy)[sub 3]. © 2001 American Institute of Physics.
ACCESSION #
4826011

 

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