Appending triphenyltriazine to 1,10-phenanthroline: a robust electron-transport material for stable organic light-emitting diodes.
Sci Bull (Beijing)
; 63(7): 446-451, 2018 Apr 15.
Article
em En
| MEDLINE
| ID: mdl-36658940
There has been an increasing demand for high-performance and cost-effective organic electron-transport materials for organic light-emitting diodes (OLEDs). In this contribution, we present a simple compound 3-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-1,10-phenanthroline through the facile Pd-catalyzed coupling of a triphenyltriazine boronic ester with 3-bromo-1,10-phenanthroline. It shows a high Tg of 112⯰C. The ultraviolet photoelectron spectroscopy measurements reveal a deep HOMO level of -6.5â¯eV. The LUMO level is derived as -3.0â¯eV, based on the optical bandgap. The low-temperature solid-state phosphorescent spectrum gives a triplet energy of â¼2.36â¯eV. n-Doping with 8-hydroxyquinolatolithium (Liq, 1:1) leads to considerably improved electron mobility of 5.2â¯×â¯10-6-5.8â¯×â¯10-5â¯cm2â¯V-1â¯s-1 at Eâ¯=â¯(2-5)â¯×â¯105â¯Vâ¯cm-1, in contrast with the triarylphosphine oxide-phenantroline molecular conjugate we reported previously. It has been shown that through optimizing the device structure and hence suppressing polaron-exciton annihilation, introducing this single Liq-doped electron-transport layer could offer high-efficiency and stable phosphorescent OLEDs.
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Bases de dados:
MEDLINE
Idioma:
En
Revista:
Sci Bull (Beijing)
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
China