Observation of red intraligand electrophosphorescence from a stilbene-containing Re(I) complex

Li, Bin; Li, Mingtao; Hong, Ziruo; Li, Wenlian; Yu, Tianzhi; Wei, Hanzhi
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4786
Academic Journal
Red organic light-emitting diodes using a rhenium(I) bipyridyl complex, fac-[ClRe(CO)3(trans-4-methyl-4'-(2-4-octadecyloxylphenyl)vinyl)-2,2'-bipyridine] (Re-mopvh), as an emitter were fabricated. The optimized device has a bilayer structure of indium-tin oxide/poly(N-vinylcarbazole): 2 wt. % Re-mopvh (80 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (50 nm)/LiF (1 nm)/Al (150 nm). Although no photoluminescence from Re-mopvh in the room-temperature solution appeared due to photoinduced isomerization, a bright red electrophosphorescence from an intraligand excited state of Re-mopvh was observed at room temperature, indicating the promising future of such a class of electroluminescent materials. The maximum luminance exceeding 120 cd/m² at 11 V and maximum efficiency of 0.75 cd/A at 7.5 V were obtained.


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