Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates

Hippola, Chamika; Kaudal, Rajiv; Manna, Eeshita; Xiao, Teng; Peer, Akshit; Biswas, Rana; Slafer, Warren Dennis; Trovato, Tom; Shinar, Joseph; Shinar, Ruth

doi:10.1002/adom.201701244

Title: Enhanced Light Extraction from OLEDs Fabricated on Patterned Plastic Substrates

Journal Article · 19 February 2018 · Advanced Optical Materials

DOI: https://doi.org/10.1002/adom.201701244 · OSTI ID:1425476

Hippola, Chamika ^[1]; Kaudal, Rajiv ^[1]; Manna, Eeshita ^[2]; Xiao, Teng ^[1]; Peer, Akshit ^[3]; Biswas, Rana ^[4]; Slafer, Warren Dennis ^[5]; Trovato, Tom ^[6];

^[1]; Shinar, Ruth ^[7]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Physics & Astronomy Dept.
Iowa State Univ., Ames, IA (United States). Electrical and Computer Engineering Dept.
Ames Lab. and Iowa State Univ., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Electrical and Computer Engineering Dept., and Microelectronics Research Center
Ames Lab. and Iowa State Univ., Ames, IA (United States). Physics & Astronomy Dept.; Iowa State Univ., Ames, IA (United States). Electrical and Computer Engineering Dept., and Microelectronics Research Center
MicroContinuum, Inc., Cambridge, MA (United States)
Trovato Manufacturing, Inc., Victor, NY (United States)
Iowa State Univ., Ames, IA (United States). Electrical and Computer Engineering Dept., and Microelectronics Research Center

Abstract A key scientific and technological challenge in organic light‐emitting diodes (OLEDs) is enhancing the light outcoupling factor η _out , which is typically <20%. This paper reports experimental and modeling results of a promising approach to strongly increase η _out by fabricating OLEDs on novel flexible nanopatterned substrates that result in a >2× enhancement in green phosphorescent OLEDs (PhOLEDs) fabricated on corrugated polycarbonate (PC). The external quantum efficiency (EQE) reaches 50% (meaning η _out ≥50%); it increases 2.6x relative to a glass/ITO device and 2× relative to devices on glass/poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) or flat PC/PEDOT:PSS. A significant enhancement is also observed for blue PhOLEDs with EQE 1.7× relative to flat PC. The corrugated PC substrates are fabricated efficiently and cost‐effectively by direct room‐temperature molding. These substrates successfully reduce photon losses due to trapping/waveguiding in the organic+anode layers and possibly substrate, and losses to plasmons at the metal cathode. Focused ion beam gauged the conformality of the OLEDs. Dome‐shaped convex nanopatterns with height of ∼280–400 nm and pitch ∼750–800 nm were found to be optimal. Substrate design and layer thickness simulations, reported first for patterned devices, agree with the experimental results that present a promising method to mitigate photon loss paths in OLEDs.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0011337; EE0007621; AC02-07CH11358; DE‐SC0011337; DE‐EE0007621

OSTI ID:: 1425476

Alternate ID(s):: OSTI ID: 1415661

Report Number(s):: IS-J-9585

Journal Information:: Advanced Optical Materials, Vol. 6, Issue 4; ISSN 2195-1071

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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36 MATERIALS SCIENCE
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organic light-emitting diodes
outcoupling
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