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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S5 — Sep. 12, 2011
  • pp: A1117–A1125

Spontaneous buckling in flexible organic light-emitting devices for enhanced light extraction

Byoungchoo Park and Hong Goo Jeon  »View Author Affiliations

Optics Express, Vol. 19, Issue S5, pp. A1117-A1125 (2011)

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We herein present the results of a study of the direct fabrication of buckled patterns in flexible organic light-emitting devices (FOLEDs) that had a conducting polymer anode on a polyethersulfone substrate. These patterns were produced spontaneously by the thermal deposition of an aluminum cathode on an electroluminescent (EL) composite layer. The polymer used for the anode was modified poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) and the EL layer was composed of a solution-processable small molecular composite including phosphorescent Iridium complex mixed with a poly(vinylcarbazole) host. It is shown that FOLEDs produced with buckled patterns can exhibit a luminance as high as ca. 14,900 cd/m2 with a peak efficiency of 50.5 cd/A. The patterned structure formed by the buckling of the EL layer allows FOLEDs to be produced with a high peak external quantum efficiency of 15% with an increase in light extraction by a factor of ca. 3.1. These results show that spontaneous buckling yields patterned structures that offer considerable promise for the production of high performance, reproducible and reliable FOLEDs.

© 2011 OSA

OCIS Codes
(250.3680) Optoelectronics : Light-emitting polymers
(260.3800) Physical optics : Luminescence
(310.1860) Thin films : Deposition and fabrication
(310.6845) Thin films : Thin film devices and applications

ToC Category:

Original Manuscript: June 10, 2011
Revised Manuscript: July 25, 2011
Manuscript Accepted: July 25, 2011
Published: August 4, 2011

Virtual Issues
March 14, 2012 Spotlight on Optics

Byoungchoo Park and Hong Goo Jeon, "Spontaneous buckling in flexible organic light-emitting devices for enhanced light extraction," Opt. Express 19, A1117-A1125 (2011)

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