Improvement of light outcoupling efficiency of organic light-emitting diodes utilizing microlens array fabricated using poly oxymethylene mold
- Authors
- Kim, Hyun Soo; Jeong, Ki Won; Yi, Geum Ran; Kim, Chang Kyo
- Issue Date
- 2017
- Publisher
- Taylor & Francis
- Keywords
- Light outcoupling efficiency; micro milling machine; microlens array; organic light-emitting diode; POM mold
- Citation
- Molecular Crystals and Liquid Crystals, v.651, no.1, pp 55 - 63
- Pages
- 9
- Journal Title
- Molecular Crystals and Liquid Crystals
- Volume
- 651
- Number
- 1
- Start Page
- 55
- End Page
- 63
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/8414
- DOI
- 10.1080/09273948.2017.1338886
- ISSN
- 1542-1406
1543-5318
- Abstract
- This paper reports a new method for fabrication of microlens arrays using a polyoxymethylene (POM) mold with concave-type cylindrical holes prepared by mechanical-micro milling without photolithography and wet etching processes. Microlens arrays were fabricated by a replica molding process using the concave-type POM mold. A polymethylmethacrylate (PMMA) thin film was deposited onto the POM mold and a concave PMMA template was prepared by blowing a nitrogen gas stream onto the thin PMMA film suspended on the micro POM mold. Microlens arrays were fabricated by pouring ultraviolet (UV)-epoxy onto the concave PMMA template and curing the UV-epoxy under UV light. Two types of microlens arrays, one with a hemispherical structure and one with a truncated-cone-type structure, were fabricated. After attaching the hemispherical microlens array onto organic light-emitting diodes (OLEDs), the external quantum efficiency (EQE) of the OLEDs was enhanced by approximately 56.5%. This work provides a valuable method for easy fabrication of microlens arrays with diameters of several hundred micrometers.
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Collections - College of Engineering > Department of Display and Electronic Information Engineering > 1. Journal Articles
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