Red electrophosphorescence devices based on rhenium complexes

Li, Feng; Zhang, Ming; Feng, Jing; Cheng, Gang; Wu, Zhijun; Ma, Yuguang; Liu, Shiyong; Sheng, Jiacong; Lee, S. T.
July 2003
Applied Physics Letters;7/14/2003, Vol. 83 Issue 2, p365
Academic Journal
Red electrophosphorescence from light-emitting devices based on two rhenium(I) diimine complexes, (4,4′-dimethyl formate-2,2′-bipyridine)Re(CO)[3Cl(dmfbpy-Re) and (4,4′-dibutyl formate-2,2′-bipyridineRe(CO)[SUB3]Cl (dbufbpy-Re), is reported. N, N′-di-1-naphthyl-N, N′-diphenylbenzidine is used as the hole-transporting layer. 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, bathocuproine is used to confine excitons within the luminescence zone. dmfbpy-Re and dbufbpy-Re are doped into the host materials (4,4′-N-N′-dicarbazole)biphenyl with mass ratios of 2%-20% as the light-emitting layer. Red emission from both complexes is achieved and the main peaks of both photoluminescence and electroluminescence are at about 610 nm. The turn-on voltage, maximum efficiency, and brightness for red emission achieved from the devices based on dmfbpy-Re and dbufbpy-Re are ∼5 V, 1.3 cd/A, and 582 cd/m[SUP2] and ∼4 V, 1.1 cd/A, and 739 cd/m[SUP2], respectively.


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