Effect of dipole position and orientation on light extraction for red OLEDs on periodically corrugated substrate - FEM simulations study

Kovačič, Milan (author)

One of the main efficiency-limiting factors for organic light-emitting diodes (OLEDs) is poor light extraction, which typically reaches only 20% (in best cases up to 30%) in flat standard devices. Optical modeling and simulations play an important role in improving light extraction and optimizing outcoupling efficiency. Using FEM modeling approach, the effect of dipole positions and orientations for red OLEDs on periodically corrugated substrate is evaluated and used to enhance the outcoupling efficiency. It is shown that with only 3 carefully selected dipole positions, the outcoupling efficiency over the whole area can be predicted with very reasonable accuracy, which greatly reduces the number of simulations required. The presented modelling approach is used for optimization of the sine texture as a substrate corrugation structure. OLEDs with optimized simulated texture show a relative improvement of light outcoupling from the thin film stack to the substrate by more than 25% compared to the flat plane devices.

• Language: English
• Keywords: organic light emitting diodes, OLED, outcoupling, finite element method, FEM, 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: 01.01.2021
• Year: 2021
• Number of pages: Str. 73-84
• Numbering: Letn. 51, št. 1
• PID: 20.500.12556/RUL-142382
• UDC: 621.38
• ISSN on article: 0352-9045
• DOI: 10.33180/InfMIDEM2021.105
• COBISS.SI-ID: 63845379
• Publication date in RUL: 04.11.2022

Record is a part of a journal

• Title: Informacije MIDEM. časopis za mikroelektroniko, elektronske sestavne dele in materiale
• Shortened title: Inf. MIDEM
• Publisher: Strokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale
• ISSN: 0352-9045
• COBISS.SI-ID: 1220612

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• 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: 16.03.2021

Secondary language

• Language: Slovenian
• Title: Vpliv pozicije in orientacije dipola na izstop svetlobe rdečih OLED na periodično teksturiranem substratu - FEM simulacijska obravnava

Abstract

Eden izmed glavnih dejavnikov, ki omejujejo učinkovitost organskih svetlečih diod (OLED), je nizka stopnja učinkovitosti izstopa svetlobe, ki pri standardnih napravah dosega le okoli 20% (v najboljših primerih pa do 30%). Optično modeliranje in simulacije igrajo pomembno vlogo pri izboljšanju izstopa svetlobe in optimizaciji optičnega izkoristka. Z uporabo FEM modeliranja se ovrednoti učinek položaja in usmeritve dipolov za rdečo OLED na periodično teksturiranem substratu, ki se uporablja za povečanje učinkovitosti izstopa svetlobe. Pokaže se, da je mogoče s samo 3 skrbno izbranimi položaji dipola, z dobro natančnostjo napovedati učinkovitost izstopa na celotnem območju, kar močno zmanjša število zahtevanih simulacij. Predstavljeni FEM pristop se uporabi za optimizacijo sinusne teksture kot strukture teksturiranega substrata. OLED z optimizirano simulirano teksturo kažejo relativno več kot 25% izboljšanje učinkovitosti izstopa svetlobe iz tankoplastne strukture v substrat v primerjavi s ploščatimi napravami.

• Keywords: organske svetleče diode, izstop svetlobe, metoda končnih elementov, optično modeliranje

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: N1-0197
• Name: Izboljšanje presejanja za rak dojke z analizo kvantitativnih slikovnih biomarkerjev kot množičnih podatkov

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