Issue 6, 2018

Contribution of TADF and exciplex emission for efficient “warm-white” OLEDs

Abstract

The bicarbazole derivative 4,4′-(9H,9′H-[3,3′-bicarbazole]-9,9′-diyl)bis(3-(trifluoromethyl)benzonitrile), denoted as pCNBCzoCF3, was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet–triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,4′,4′′-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF3/m-MTDATA interface, we fabricated a number of highly efficient “warm-white” OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40 900 Cd m−2 (at 15 V), current efficiency of 53.8 Cd A−1 and power efficiency of 19.3 lm W−1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m−2 (current efficiency of 46.2 Cd A−1, power efficiency of 10.6 lm W−1, EQE of 17.0%).

Graphical abstract: Contribution of TADF and exciplex emission for efficient “warm-white” OLEDs

Supplementary files

Article information

Article type
Paper
Submitted
24 Nov 2017
Accepted
12 Jan 2018
First published
15 Jan 2018

J. Mater. Chem. C, 2018,6, 1543-1550

Contribution of TADF and exciplex emission for efficient “warm-white” OLEDs

G. Grybauskaite-Kaminskiene, K. Ivaniuk, G. Bagdziunas, P. Turyk, P. Stakhira, G. Baryshnikov, D. Volyniuk, V. Cherpak, B. Minaev, Z. Hotra, H. Ågren and J. V. Grazulevicius, J. Mater. Chem. C, 2018, 6, 1543 DOI: 10.1039/C7TC05392D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements