| Title |
New bipolar derivatives with diphenylsulfone or diphenylphenone as TADF based emitters OLEDS |
| Authors |
Krucaite, Gintare ; Tavgeniene, Daiva ; Grigalevicius, Saulius ; Chen, Yi-Ting ; Chen, Yu-Hsuan ; Chang, Chih-Hao ; Beresneviciute, Raminta |
| DOI |
10.15388/Proceedings.2024.46 |
| ISBN |
9786090710517 |
| Full Text |
|
| Is Part of |
Open readings 2024: the 67th international conference for students of physics and natural sciences: book of abstracts / editors: M. Keršys, R. Naina, V. Adomaitis, E. Maskvytis.. Vilnius : Vilnius University Press, 2024. p. 185.. ISBN 9786090710517 |
| Abstract [eng] |
To resolve the energy crisis, there has been huge interest in the development of lighting technologies that are energy-efficient, cleaner and more affordable. Organic light-emitting diodes (OLEDs), which are mainly formed of thin films of organic molecules, have been regarded as the sustainable and very attractive strategy to achieve the goal [1, 2, 3]. The TADF based emitters EM1–EM2 were prepared in reactions of the 3-(N,N-diphenylamino)-9Hcarbazole with 9-(4-(4-fluorophenylsulfonyl)phenyl)carbazole or 4-(carbazol-9-yl)-4’-fluorobenzophenone , correspondingly. Bipolar derivatives having thermally activated delayed fluorescence (TADF) functions were synthesized by multistep synthetic procedure by using 3-(N,N-diphenylamino)-9H-carbazole and 9-(4-(4- fluorophenylsulfonyl)phenyl)carbazole or 4-(carbazol-9-yl)-4 '-fluorobenzophenone in the final step. The materials have high thermal stabilities and form molecular glasses with very high glass transition temperatures of 140 oC - 143 oC. The compounds were tested in multilayer TADF based organic light emitting diodes (OLEDs). The most efficient green device demonstrated low turn-on voltage of 2.2 V, maximum luminance of 60155 cd/m2 and high peak efficiency values of 12.1% (35.4 cd/A and 46.3 lm/W). At higher practical luminance of 100 cd/m2 or 1000 cd/m2, the device remained also highly efficient with 12.1% and 11.1%, correspondingly. |
| Published |
Vilnius : Vilnius University Press, 2024 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2024 |
| CC license |
|
