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Soft lithography microlens fabrication and array for enhanced light extraction from organic light emitting diodes (OLEDs)

United States Patent

June 3, 2014
View the Complete Patent at the US Patent & Trademark Office
Provided are microlens arrays for use on the substrate of OLEDs to extract more light that is trapped in waveguided modes inside the devices and methods of manufacturing same. Light extraction with microlens arrays is not limited to the light emitting area, but is also efficient in extracting light from the whole microlens patterned area where waveguiding occurs. Large microlens array, compared to the size of the light emitting area, extract more light and result in over 100% enhancement. Such a microlens array is not limited to (O)LEDs of specific emission, configuration, pixel size, or pixel shape. It is suitable for all colors, including white, for microcavity OLEDs, and OLEDs fabricated directly on the (modified) microlens array.
Leung; Wai Y. (Ames, IA), Park; Joong-Mok (Ames, IA), Gan; Zhengqing (Pleasant Hill, CA), Constant; Kristen P. (Ames, IA), Shinar; Joseph (Ames, IA), Shinar; Ruth (Ames, IA), Ho; Kai-Ming (Ames, IA)
Iowa State University Research Foundation, Inc. (Ames, IA)
13/ 397,749
February 16, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT This invention was made in part with Government support under Grant Number DE-AC02-07CH11358 awarded by the Department of Energy. The Government has certain rights in this invention.