Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/26149
Title: | Optimizing the outcoupling efficiency and the radiation pattern of organic light emitting devices by inkjet printing lens arrays films | Authors: | CRAMER, Martijn VERBOVEN, Inge DRIJKONINGEN, Jeroen DEFERME, Wim |
Issue Date: | 2018 | Source: | Reineke, Sebastian; Vandewal, Koen (Ed.). Proceedings of SPIE,p. 1068710-1-1068710-10 (Art N° 1068710) | Series/Report: | Organic Electronics and Photonics: Fundamentals and Devices | Series/Report no.: | 10687 | Abstract: | It is known that organic light emitting diodes (OLEDs) can reach an internal quantum efficiency close to 100 %1 . Outcoupling of the generated photons however is not that efficient resulting in an extraction efficiency of only around 20 %2 . This is mainly due to total internal reflection at the OLED-substrate and substrate-air interfaces. In recent literature1,3 , lenses are proven to be an adequate solution, but lens production techniques are complex, expensive and unsuitable for mass production. The aim of this research is therefore to investigate the development of a cost-effective lens array film by inkjet printing. These inkjet printed lenses are validated by pixelated OLEDs. Firstly, circular patterns of anisole are printed in a regular hexagon on PMMA-foil. Due to the coffee ring effect, reservoirs are formed in this foil which prevent the liquid lenses from merging. Afterwards these lenses, i.e. spherical droplets of NOA74, are deposited into these reservoirs and cured by ultraviolet light. Finally, the lenses are connected to printed pixelated OLEDs. The developed lens array film increases the OLED’s outcoupling efficiency by more than 20 % as is also expected from a theoretical study on these light extraction principles. The combination of the above-mentioned route for lens printing with the deposition of patterned OLED pixels, will not only improve the outcoupling to a large extend but will also help to develop OLEDs with a tailored emission pattern. A throughout understanding of the principles behind it will lead to optimized extraction efficiencies for large area printed OLED panels. | Notes: | Deferme, W (reprint author), Univ Hasselt, Inst Mat Res IMO IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. | Keywords: | lens array film; inkjet printing; pixelated OLED | Document URI: | http://hdl.handle.net/1942/26149 | ISBN: | 9781510619005 | DOI: | 10.1117/12.2306084 | ISI #: | 000453618300006 | Category: | C1 | Type: | Proceedings Paper | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Final Proceeding SPIE.pdf Restricted Access | Published version | 845.7 kB | Adobe PDF | View/Open Request a copy |
SCOPUSTM
Citations
1
checked on Sep 3, 2020
WEB OF SCIENCETM
Citations
1
checked on Apr 14, 2024
Page view(s)
156
checked on Sep 7, 2022
Download(s)
150
checked on Sep 7, 2022
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.