Importance of interface control in solution processed organic light emitting diodes

Da Hwan Lee, Jaeseung Kim, Hyunjung Kim, Min Chul Suh

Research output: Contribution to journalConference articlepeer-review

Abstract

It is very difficult to realize highly efficient and stable solution processed organic light emitting diodes (OLEDs) due to an interface mixing behavior during continuous wet processes. To eliminate this problem, we need to form a cross-linkable hole transport layer (x-HTL) before depositing an emitting layer (EML). However, we cannot clearly solve interface mixing problem although we use such x-HTL during process. Especially, we found that the crosslinking of HTL causes serious reduction of hole mobility, which results in shift of exciton formation zone toward HTL / EML interface. Thus, we need to focus on EML composition because the interface mixing could be accelerated if the thermal stability of materials in EML is very poor. In other words, small molecules in EML often diffuse into the preceding HTL although it's crosslinked. Besides, we also found that the thermal stability of host materials in EML is very important for this interface mixing behavior.

Original languageEnglish
Pages (from-to)67-70
Number of pages4
JournalDigest of Technical Papers - SID International Symposium
Volume52
Issue numberS1
DOIs
Publication statusPublished - 2021
EventInternational Conference on Display Technology, ICDT 2020 - Wuhan, China
Duration: 18 Oct 202021 Oct 2020

Bibliographical note

Publisher Copyright:
© 2021, John Wiley and Sons Inc. All rights reserved.

Keywords

  • Free volume
  • Interface mixing
  • Phase separation
  • Segmental motion
  • Solution process

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