Novel fabrication method of microlens arrays with High OLED outcoupling efficiency
- Authors
- Kim, Hyun Soo; Moon, Seong Il; Hwang, Dong Eui; Jeong, Ki Won; Kim, Chang Kyo; Moon, Dae-Gyu; Hong, Chinsoo
- Issue Date
- Mar-2016
- Publisher
- Elsevier BV
- Keywords
- OLEDs; Pyramidal microlens array; Hemispherical microlens; Out-coupling; PMMA
- Citation
- Optics and Laser Technology, v.77, pp 104 - 110
- Pages
- 7
- Journal Title
- Optics and Laser Technology
- Volume
- 77
- Start Page
- 104
- End Page
- 110
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/9343
- DOI
- 10.1016/j.optlastec.2015.09.006
- ISSN
- 0030-3992
1879-2545
- Abstract
- We presented a novel fabrication method of pyramidal and hemispherical polymethylmethacrylate (PMMA) microlens arrays to improve the outcoupling efficiency. Pyramidal microlens arrays were fabricated by replica molding processes using concave-pyramidal silicon molds prepared by the wet etching method. Concave-hemispherical PMMA thin film was used as a template for fabrication of the hemispherical microlens array. The concave-hemispherical PMMA template was prepared by blowing a N-2 gas stream onto the thin PMMA film suspended on a silicon pedestal. A PMMA microlens arrays with hemispherical structure were fabricated by a replica molding process. The outcoupling efficiency of the hemispherical microlens array was greater than that of the pyramidal microlens array. The outcoupling efficiency of hemispherical microlens arrays with a higher contact angle was larger than that of those with lower contact angle. This indicates that, for the hemispherical microlens with larger contact angle, more light can be extracted from the OLEDs due to the decrease in the incident angle of the light at the interface between an air and a hemispherical microlens arrays. After attaching a hemispherical microlens array with contact angle of 50.4 degrees onto the OLEDs, the luminance was enhanced by approximately 117%. (C) 2015 Elsevier Ltd. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
- College of Engineering > Department of Display Materials Engineering > 1. Journal Articles
- College of Engineering > Department of Display and Electronic Information Engineering > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/9343)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.