Highly efficient electrophosphorescence devices based on rhenium complexes

Feng Li; Ming Zhang; Cheng, Gang; Feng, Jing; Zhao, Yi; Ma, Yuguang; Liu, Shiyong; Shen, Jiacong
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p148
Academic Journal
Highly efficient electrophosphorescence from light-emitting devices based on two types of rhenium(I) diimine complexes, (1,10-phenanthroline)Re(CO)[sub 3]Cl (phen-Re) and (2,9-dimethyl-1,10-phenanthroline)Re(CO)[sub 3]Cl (dmphen-Re), is reported. N, N[sup ′]-di-1-naphthyl-N, N[sup ′]-diphenylbenzidine is used as the hole-transporting layer. 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline is used to confine excitons within the luminescence zone. phen-Re and dmphen-Re are doped into the host material (4,4[sup ′]-N-N[sup ′]-dicarbazole)biphenyl with mass ratios of 2–20% as the light-emitting layer, respectively. The maximum efficiency and brightness achieved from the devices based on phen-Re and dmphen-Re are 6.67 cd/A and 2769 cd/m[sup 2], and 7.15 cd/A and 3686 cd/m[sup 2], respectively. © 2004 American Institute of Physics.


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