Publication detail

Electronic Structure of Exciplexes and the Role of Local Triplet States on Efficiency of Thermally Activated Delayed Fluorescence

Chapran, M. Sahalianov, I. Karaush-Karmazin, NN. Wiosna-Salyga, G. Glowacki, I. Luszczynska, B. Pander, P. Baryshnikov, GV.

Original Title

Electronic Structure of Exciplexes and the Role of Local Triplet States on Efficiency of Thermally Activated Delayed Fluorescence

Type

journal article in Web of Science

Language

English

Original Abstract

In this work, we present an investigation of the electronic states in a series of thermally activated delayed fluorescence (TADF) exciplexes formed with the popular electron-transport compound TpBpTa and hole-transporting TCTA, TAPC, TPD10, TPD, and NPB. We rationalize the photophysical behavior of exciplexes by using computational methods and demonstrate that the reason for the commonly observed temporal red shift in the time-resolved spectra is related to the distribution of molecular conformations, thus CT energy, in film. We also use spectrally resolved thermoluminescence (SRTL) measurements to give insight into the trapping phenomena in exciplex blends. The results demonstrate that trapped charge carriers in the majority of studied exciplexes recombine through the luminescent intermolecular CT state. In addition, we report OLED devices using the said exciplexes in the emissive layer. The best performance is obtained with the TCTA:TpBpTa and TAPC:TpBpTa exciplexes showing maximum external quantum efficiencies (EQEs) of 8.8% and 7.2%, respectively.

Keywords

exciplex; thermally activated delayed fluorescence; TADF; OLED; charge-trapping

Authors

Chapran, M.; Sahalianov, I.; Karaush-Karmazin, NN.; Wiosna-Salyga, G.; Glowacki, I.; Luszczynska, B. ; Pander, P.; Baryshnikov, GV.

Released

28. 3. 2023

Publisher

AMER CHEMICAL SOC

Location

WASHINGTON

ISBN

2637-6113

Periodical

ACS Applied Electronic Materials

Year of study

5

Number

3

State

United States of America

Pages from

1489

Pages to

1501

Pages count

13

URL

https://pubs.acs.org/doi/10.1021/acsaelm.2c01518

BibTex

@article{BUT183779,
  author="Chapran, M. and Sahalianov, I. and Karaush-Karmazin, NN. and Wiosna-Salyga, G. and Glowacki, I. and Luszczynska, B. and Pander, P. and Baryshnikov, GV.",
  title="Electronic Structure of Exciplexes and the Role of Local Triplet States on Efficiency of Thermally Activated Delayed Fluorescence",
  journal="ACS Applied Electronic Materials",
  year="2023",
  volume="5",
  number="3",
  pages="1489--1501",
  doi="10.1021/acsaelm.2c01518",
  issn="2637-6113",
  url="https://pubs.acs.org/doi/10.1021/acsaelm.2c01518"
}