Fabrication of Flexible PDMS Films with Micro-Convex Structure for Light Extraction from Organic Light-Emitting Diodes

Eun Jeong Bae, Yeon Sik Kim, Geun Su Choi, Byeong Kwon Ju, Dong Hyun Baek, Young Wook Park

Research output: Contribution to journalArticlepeer-review


In this study, we demonstrated organic light-emitting diodes (OLEDs) outcoupling with a flexible polydimethylsiloxane (PDMS) film with a micro-convex structure using the breath figure (BF) method. We can easily control the micro-convex pattern by adjusting the concentration of polystyrene and the humidity during the BF process. As process conditions to fabricate the micro-convex structure, polymer concentrations of 10, 20, 40, and 80 mg/mL and 60, 70, and 80% relative humidity were used. To evaluate the optical properties, we analyzed the transmission, diffusion, and electroluminescence with or without the micro-convex structure on the OLEDs. The shape and density of the micro-convex structure are related to its optical properties and outcoupling and we have experimentally demonstrated this. By applying a micro-convex structure, it achieved up to a 42% improvement in the external quantum efficiency compared to bare OLEDs (without any light extraction film). We expect the fabricated flexible light extraction film to be effective for outcoupling and applicable to flexible devices.

Original languageEnglish
Article number2216
Issue number15
Publication statusPublished - 2023 Aug

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1C1C1013567), and supported by the “Regional Innovation Strategy (RIS)” through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (2021RIS-004).

Publisher Copyright:
© 2023 by the authors.


  • breath figure
  • flexible device
  • flexible film
  • flexible PDMS film
  • light extraction
  • micro-convex structure
  • micro-lens array (MLA)
  • organic light-emitting diodes (OLEDs)
  • outcoupling
  • polydimethylsiloxane (PDMS)
  • polystyrene
  • simple process

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Materials Science


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