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P.116: Light Extraction Improvement of Flexible Top‐Emitting Organic Light‐Emitting Devices by Using Nanoimprinted Periodically Corrugated Polycarbonate Substrate
Author(s) -
Ho YuHsuan,
Tsai MingChih,
Liang Hsun,
Fu YenChun,
Tian WeiCheng,
Chen FangChung,
Wei PeiKuen
Publication year - 2013
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2013.tb06510.x
Subject(s) - materials science , nanoimprint lithography , optoelectronics , substrate (aquarium) , grating , cathode , coupling (piping) , polycarbonate , waveguide , fabrication , composite material , chemistry , medicine , oceanography , alternative medicine , pathology , geology
Highly efficient waveguide mode extraction elements of nanograting structures onto the flexible substrate of top‐emitting organic light‐emitting devices (TOLEDs) were realized with the assistance of thermal nanoimprint process. The introduction of the periodic corrugation has allowed a much enhanced light coupling through a thick Ag cathode by the grating‐induced cross coupling between the SPPs associated with the top cathode and the high‐index guided modes within the device. An enhanced EL efficiency and strong color shift have been observed. To nanoimprint the periodical corrugation in the flexible substrate of the TOLEDs leads to 54.3% enhancement in luminous efficiency compared to reference devices.