Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Bicarbazole-benzophenone based twisted donor-acceptor derivatives as potential blue emitters for OLEDs

Iram Siddiqui
,
Prakalp Gautam
,
Dovydas Blazevicius
ORCID logo ,
Jayakumar Jayakumar
ORCID logo ,
Sushanta Lenka
ORCID logo ,
Daiva Tavgeniene
ORCID logo ,
Ernestas Zaleckas
,
Jwo-Huei Jou
ORCID logo ,
Saulius Grigalevicius
* ORCID logo
Version 1 : Received: 27 February 2024 / Approved: 6 March 2024 / Online: 7 March 2024 (09:34:59 CET)

A peer-reviewed article of this Preprint also exists.

Siddiqui, I.; Gautam, P.; Blazevicius, D.; Jayakumar, J.; Lenka, S.; Tavgeniene, D.; Zaleckas, E.; Grigalevicius, S.; Jou, J.-H. Bicarbazole-Benzophenone Based Twisted Donor-Acceptor Derivatives as Potential Blue TADF Emitters for OLEDs. Molecules 2024, 29, 1672. Siddiqui, I.; Gautam, P.; Blazevicius, D.; Jayakumar, J.; Lenka, S.; Tavgeniene, D.; Zaleckas, E.; Grigalevicius, S.; Jou, J.-H. Bicarbazole-Benzophenone Based Twisted Donor-Acceptor Derivatives as Potential Blue TADF Emitters for OLEDs. Molecules 2024, 29, 1672.

Abstract

We introduce a series of twisted donor-acceptor (D-A) carbazole-benzophenone based electroactive bipolar derivatives that were synthesized through the reaction of 4-fluorobenzophenone with various partially alkylated 3,3’-bicarbazoles. The comprehensive structural characterization of these compounds is provided. These amorphous materials exhibit suitable glass transition temperatures ranging from 57 to 102 °C and demonstrate high thermal stability, with decomposition temperatures reaching 400 °C. Moreover, the developed materials exhibit elevated photoluminescence quantum yields (PLQY) of up to 75.5% and favorable HOMO-LUMO levels, along with suitable triplet-singlet state energy values. Due to their good solubility and suitable film-forming properties, all the compounds were evaluated as blue emitters dispersed in 4,4’-bis(N-carbazolyl)-1,10-biphenyl (CBP) host for the fabrication of organic light-emitting diodes (OLEDs) in concentration dependent experiments. Among these experiments, the device containing 15 wt% of the guest 4-(9’-{2-ethylhexyl}-[3,3’]-bicarbazol-9-yl)benzophenone demonstrated the best characteristics, achieving maximum brightness of 3581 cd/m2, current efficiency of 5.7 cd/A, power efficiency of 4.1 lm/W and external quantum efficiency of 2.7%.

Keywords

donor-acceptor derivatives; blue organic light emitting diode; high efficiency; blue emission; thermal analysis

Subject

Chemistry and Materials Science, Materials Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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