Title An experimental and theoretical study of exciplex-forming compounds containing trifluorobiphenyl and 3,6-di-tert-butylcarbazole units and their performance in OLEDs /
Authors Keruckiene, R ; Guzauskas, M ; Lapienyte, L ; Simokaitiene, J ; Volyniuk, D ; Cameron, J ; Skabara, P.J ; Sini, G ; Grazulevicius, J.V
DOI 10.1039/d0tc02777d
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Is Part of Journal of materials chemistry C.. Cambridge : Royal society of chemistry. 2020, vol. 8, iss. 40, p. 14186-14195.. ISSN 2050-7526. eISSN 2050-7534
Keywords [eng] exciplex ; OLED ; emission ; quinalizone
Abstract [eng] Derivatives of trifluorobiphenyl and 3,6-di-tert-butylcarbazole were synthesised as potential components of emitting layers of OLEDs. Molecular design of the compounds was performed taking into consideration the hydrogen bonding ability of the fluorine atom and electron-donating ability of the carbazole moiety. Their toluene solutions exhibited very high triplet-energy values of 3.03 eV and 3.06 eV. Ionisation energies of the compounds in the solid-state were found to be in the range from 5.98 to 6.17 eV. Density functional theory (DFT) calculations using the oB97XD functional, with the o parameter tuned in the presence of the solvent, uncovered singlet–triplet energy splitting in good agreement with the experimental results. The materials were tested in the emissive layers of OLEDs, showing the ability to form exciplexes with complementary electron-accepting 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5- triazine. Using the synthesised compounds as exciplex-forming materials, highly efficient exciplex emission-based OLEDs were developed. In the best case, a high maximum current efficiency of 24.8 cd A1, and power and external quantum efficiencies of 12.2 lm W1 and 7.8%, respectively, were achieved.
Published Cambridge : Royal society of chemistry
Type Journal article
Language English
Publication date 2020
CC license CC license description