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Combinatorial Fabrication and Studies of Small Molecular Organic Light-Emitting

Published online by Cambridge University Press:  01 February 2011

Devices G. Li ,
L. Zou ,
K. O. Cheon  and
J. Shinar
Devices G. Li
Affiliation:
Department of Physics and Astronomy Iowa Sate University, Ames, Iowa 50011
L. Zou
Affiliation:
Department of Physics and Astronomy Iowa Sate University, Ames, Iowa 50011
K. O. Cheon
Affiliation:
Department of Physics and Astronomy Iowa Sate University, Ames, Iowa 50011
J. Shinar
Affiliation:
Ames Laboratory - USDOE, Ames, Iowa 50011
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Abstract

Various combinatorial matrix arrays of UV-violet, white, and blue-to-red organic light-emitting devices (OLEDs), fabricated using a sliding shutter technique, are described. In the UV-violet devices, which contain a UV-violet emitting layer of 4,4′-bis(9-carbazolyl) biphenyl (CBP), the optimal radiance R and external quantum efficiency ηext were determined with respect to the thicknesses of the hole transporting layers. In the blue-to-red devices, which contained a blue-emitting layer of 4,4′-bis(2,2′-diphenyl-vinyl) -1,1′-biphenyl (DPVBi) and a red-emitting 5 wt.% dye-doped guest-host layer, the color of the devices evolved continuously from blue to red as the thickness of the doped layer increased from 0 to 35 Å. The (nominal) 2 Å-thick doped layer device exhibited the highest brightness L ∼ 120 Cd/m2 and external quantum efficiency ηext ∼4.4 % at a current density of 1 mA/cm2. In the white OLEDs, which were similar to the blue-to-red devices but with lightly doped emission layer, the highest brightness Lmax was over 74,000 Cd/m2; in all devices Lmax exceeded 50,000 Cd/m2. The maximum efficiencies were 11.0 Cd/A, 5.96 lm/W and 4.6% at 5.8 V, 0.6 mA/cm2, and 68 Cd/m2 in a 0.25 wt.%, 2 nm-thick doped layer device.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 804: Symposium JJ – Combinatorial and Artificial Intelligence Methods in Materials Science II , 2003 , JJ3.3
Copyright
Copyright © Materials Research Society 2004

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References

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