Efficient organic red electroluminescent device with narrow emission peak

Tao, X. T.; Miyata, S.; Sasabe, H.; Zhang, G. J.; Wada, T.; Jiang, M. H.
January 2001
Applied Physics Letters;1/15/2001, Vol. 78 Issue 3, p279
Academic Journal
We report a red fluorescent material of 3-(dicyanomethylene)-5,5-dimethyl-1(4-dimethylamino-styryl)cyclohexene (DCDDC) and its use as emitter or dopant in tris-(8-hydroxyquinoline) aluminum based electrolumiescent (EL) devices. The DCDDC was synthesized by a simple "one-pot" reaction and shows bright red photoluminescence with a peak wavelength at 650 nm. EL properties of double-layer light-emitting diodes of indium tin oxide (ITO)/poly(N)-vinylcarbazole (PVK):N,N[sup ′]-diphenyl-N,N-bis(3-methylphenyl)1,1-biphenyl-4,4[sup ′]-diamine (TPD)/DCDDC/Mg:Ag and ITO/PVK:TPD/DCDDC(1%):Alq[sub 3]/Mg:Ag using DCDDC as red emitters or dopants were characterized. The device with 1% DCDDC-doped Alq[sub 3] as emitting layer has a turn-on voltage of 5 V, and the highest luminance of 5600 cd/m[sup 2] is obtained at 15 V. The EL efficiency of the device at 100 cd/m[sup 2] is in the range of 1.1 l m/W, and the highest EL efficiency is 1.6 l m/W. The devices emit in the red region, and the full width at half maximum of the EL spectra is 70 nm. © 2001 American Institute of Physics.


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