Excitonic Creation of Highly Luminescent Defects In Situ in Working Organic Light-Emitting Diodes

Yong Biao Zhao, Grayson L. Ingram, Xi Wen Gong, Xi Yan Li, Li Na Quan, Pei Cheng Li, Jia Qi Xie, Edward H. Sargent*, Zheng Hong Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Excitons play the central role in organic optoelectronic devices. Efficient exciton-to-photon and photon-to-electron conversion promote quantum yield in optoelectronic devices such as organic light-emitting diodes and organic solar cells. Exciton-related reaction products and defects in working devices have previously been viewed as fatal to stability. Here, the utilization of these excitonic reactions to create luminescent defects with extremely high (6.7%) external quantum efficiency in an operating device containing 1,1-bis((di-4-tolylamino)phenyl) cyclohexane (TAPC) is reported. Transient photoluminescence reveals a long delayed fluorescence lifetime (2.7 µs) from these emissive defects, indicating that they exhibit thermally activated delayed fluorescence. It is shown that the functional group of tri-p-tolylamine (TPTA) follows similar processes as TAPC, suggesting that the chemical nature of the observed luminescent defects is directly related to TPTA.

Original languageEnglish (US)
Article number1700856
JournalAdvanced Optical Materials
Volume6
Issue number2
DOIs
StatePublished - Jan 18 2018

Keywords

  • degradation
  • excitons
  • luminescent defects
  • organic light-emitting diodes
  • thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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