Design of external microtextures for efficient light outcoupling in OLEDs with different preferential orientation of emission dipoles
ID Kovačič, Milan (Author)

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External light outcoupling structures provide a cost-effective and highly efficient solution for light extraction in organic light-emitting diodes. Among them, different microtextures, mainly optimized for devices with isotopically oriented emission dipoles, have been proposed as an efficient light extraction solution. In the paper, the outcoupling for a preferential orientation of emission dipoles is studied for the case of a red bottom-emitting organic light-emitting diode. Optical simulations are used to analyse the preferential orientation of dipoles in combination with three different textures, namely hexagonal array of sine-textures, three-sided pyramids, and random pyramids. It is shown that while there are minimal differences between the optimized textures, the highest external quantum efficiency of 51% is predicted by using the three-sided pyramid texture. Further improvements, by employing highly oriented dipole sources, are examined. In this case, the results show that the top outcoupling efficiencies can be achieved with the same texture shape and size, regardless of the preferred orientation of the emission dipoles. Using an optimized three-sided pyramid in combination with ideally parallel oriented dipoles, an efficiency of 62% is achievable. A detailed analysis of the optical situation inside the glass substrate, dominating external light outcoupling, is presented. Depicted results and their analysis offer a simplified further research and development of external light extraction for organic light-emitting devices with highly oriented dipole emission sources.

Keywords:organic light emitting diodes, OLED, outcoupling, ray tracing, optical modelling
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FE - Faculty of Electrical Engineering
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2022
Number of pages:Str. 1-13
Numbering:iss. 2, e141542
PID:20.500.12556/RUL-142383 This link opens in a new window
ISSN on article:1896-3757
DOI:10.24425/opelre.2022.141542 This link opens in a new window
COBISS.SI-ID:108555011 This link opens in a new window
Publication date in RUL:04.11.2022
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Record is a part of a journal

Title:Opto-electronics review
Shortened title:Opto-Electron. Rev.
Publisher:Stowarzyszenie Elektryków Polskich
COBISS.SI-ID:513715737 This link opens in a new window


License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:20.05.2022

Secondary language

Keywords:organske svetleče diode, OLED, izstop svetlobe, sledenje žarkom, optično modeliranje


Funder:ARRS - Slovenian Research Agency
Project number:P2-0415
Name:Fotovoltaika in elektronika

Funder:ARRS - Slovenian Research Agency
Project number:J2-1727
Name:Napredno modeliranje in karakterizacija visokoučinkovitih sončnih celic in fotonapetostnih modulov

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