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http://dx.doi.org/10.7471/ikeee.2022.26.2.205

Roll-to-roll microcontact-printed microlens array for light extraction film of organic light-emitting diodes  

Hwa, Subin (Dept. of Creative Convergence Engineering, Hanbat National University)
Sung, Baeksang (Dept. of Creative Convergence Engineering, Hanbat National University)
Lee, Jae-Hyun (Dept. of Creative Convergence Engineering, Hanbat National University)
Lee, Jonghee (Dept. of Creative Convergence Engineering, Hanbat National University)
Kim, Min-Hoi (Dept. of Creative Convergence Engineering, Hanbat National University)
Publication Information
Journal of IKEEE / v.26, no.2, 2022 , pp. 205-210 More about this Journal
Abstract
We demonstrated roll-to-roll microcontact printed (mCP) microlens array (MLA) to enhance the light extraction of organic light emitting diodes (OLEDs). The commercially provided microlens array is used as a template for polydimethylsiloxane (PDMS) roll stamp. The fluorinated film is formed on the PDMS roll stamp from fluorinated ink with low boiling point and printed onto the bottom side of the organic light emitting diode without high pressure and high thermal treatment. With optimized concentration of ink, the pattern which is almost identical to that of the template MLA was successfully printed. Due to the structure and low optical absorbance of microcontact printed MLA, the external quantum efficiency of OLED was improved by about 18%.
Keywords
Microlens array; light extraction; roll-to-roll; Microcontact printing; Organic Light-emitting diodes;
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