Contrast-enhancement in organic light-emitting diodes
Optics Express, Vol. 13, Issue 5, pp. 1406-1411 (2005)
http://dx.doi.org/10.1364/OPEX.13.001406
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Abstract
A high-contrast organic light-emitting diode (OLED) structure is presented. Because of poor contrast of conventional OLED resulting from high reflective metal cathode, the hybrid cathode structure was developed for low reflectivity. It consists the semitransparent cathode layers, passivation layers and a thick light-absorbing film. By optical reflectivity measurement and OLED electrical characterization tests for both OLED with the hybrid cathode and conventional OLED, it was found that the spectrum reflectance of OLED with hybrid cathode is among 8%–12%, about eight times lower than the conventional one when the two types of devices have similar turn-on voltages and current-voltage characteristics. The hybrid cathode for the high-contrast OLED is easily fabricated and its optical reflectance is slightly dependent on wavelength.
© 2005 Optical Society of America
OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(310.1860) Thin films : Deposition and fabrication
ToC Category:
Research Papers
History
Original Manuscript: December 1, 2004
Revised Manuscript: February 17, 2005
Published: March 7, 2005
Citation
Zhaoxin Wu, Liduo Wang, and Yong Qiu, "Contrast-enhancement in organic light-emitting diodes," Opt. Express 13, 1406-1411 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-5-1406
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