The full text of this article
Directional out-coupling efficiency enhancement of organic light-emitting devices by a microlens array
by Su Shen; Fang Zhou; Guojun Wei; Donglin Pu; Yun Zhou
International Journal of Nanomanufacturing (IJNM), Vol. 9, No. 5/6, 2013
Abstract: Microlens arrays film fabricated by ultra-violet (UV) roll-to-roll nanoimprinting lithography is introduced on glass substrate to directionally coupling the efficiency of organic light-emitting devices (OLEDs). The microlenses suppress wave guiding loss in the substrate and a theoretical model, based on Monte-Carlo model, is developed to simulate the enhancement effects. The numerical results show that ellipsoidal-like microlens array can not only increase the efficiency by a factor of more than 35%, but also directionally couple output light with the luminance density distribution along the orthogonal directions compressed by 10 degrees. Such a microlens array mould is fabricated by a combination of DMD-based laser direct writing lithography and thermal reflow method, followed by electroforming for transferring the surface structure to a nickel plate. The obtained mould is wrapped on a roller for the mass production of microlens array film by UV roll-to-roll nanoimprinting process. OLED attached with such microlens array film with a maximum increase of 35% in efficiency is achieved and directional out-coupling phenomenon can be observed experimentally. Such a directional out-coupling microlens array film can be used in OLED to enhance the luminous intensity efficiency and save power consumption for future lighting and display application.
Online publication date: Wed, 13-Nov-2013
is only available to individual subscribers or to users at subscribing institutions.
Go to Inderscience Online Journals to access the Full Text of this article.
Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.
Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nanomanufacturing (IJNM):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable).
See our Orders page to subscribe.
If you still need assistance, please email email@example.com