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Low efficiency roll-off blue TADF OLEDs employing a novel acridine–pyrimidine based high triplet energy host

Title data

Rodella, Francesco ; Saxena, Rishabh ; Bagnich, Sergey ; Banevičius, Dovydas ; Kreiza, Gediminas ; Athanasopoulos, Stavros ; Juršėnas, Saulius ; Kazlauskas, Karolis ; Köhler, Anna ; Strohriegl, Peter:
Low efficiency roll-off blue TADF OLEDs employing a novel acridine–pyrimidine based high triplet energy host.
In: Journal of Materials Chemistry C. Vol. 9 (2021) Issue 48 . - pp. 17471-17482.
ISSN 2050-7534
DOI: https://doi.org/10.1039/D1TC03598C

Abstract in another language

The development of efficient blue emitter–host combinations is one of the biggest challenges in organic light-emitting diode (OLED) research. Host materials play a crucial role when it comes to enhancing the efficiency, improving the lifetime and decreasing the efficiency roll-off of the device. The need for new hosts is of prime importance, especially for blue phosphorescence and thermally activated delayed fluorescence (TADF) emitters, due to their high exciton energies. The hosts are less investigated than the emitters and require further progress. This work provides a new molecular strategy that combines an acridine derivative (donor) and pyrimidine moieties (acceptors) to obtain three novel host materials. This approach demonstrates that via careful selection of donor and acceptor units, it is possible to manage the properties of the host materials, obtaining at the same time superior thermal and morphological properties and high triplet energies up to 3.07 eV. The decrease of the conjugation in the acceptor unit was found to play a crucial role in increasing the triplet energy. The most promising host 1MPA was used to fabricate blue TADF OLEDs. Using a sky-blue emitter, we achieved electroluminescence at 491 nm and a maximum external quantum efficiency (EQE) of 13.6, combined with a low efficiency roll-off, even beyond the practical brightness of 1000 cd m−1. The host 1MPA was also combined with a deep blue emitter to deliver a blue OLED with color coordinates of x = 0.16 and y = 0.18.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Jan 2022 08:43
Last Modified: 11 Jan 2022 09:23
URI: https://eref.uni-bayreuth.de/id/eprint/68288