Highly effective organic light-emitting diodes containing thermally activated delayed fluorescence emitters with horizontal molecular orientation

In this study, we report new thermally activated delayed fluorescence (TADF) emitters, AcPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine)) and PxPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(10H-phenoxazine)), by employing donor units at the 2,5-posi...

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Detalles Bibliográficos
Autores principales: Lee, Chan Hee, Choi, Shin Hyung, Oh, Sung Joon, Lee, Jun Hyeon, Shim, Jae Won, Adachi, Chihaya, Lee, Sae Youn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Chemistry
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9058249/
https://www.ncbi.nlm.nih.gov/pubmed/35514925
http://dx.doi.org/10.1039/d0ra07865d
Descripción
Sumario:In this study, we report new thermally activated delayed fluorescence (TADF) emitters, AcPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine)) and PxPYM (10,10′-(pyrimidine-2,5-diylbis(4,1-phenylene))bis(10H-phenoxazine)), by employing donor units at the 2,5-positions of the pyrimidine acceptor unit. The donor–acceptor–donor (D–A–D) units combined in the linear molecular structure of AcPYM or PxPYM enhanced the horizontally oriented alignment, and the horizontal transition dipole moments were realized by up to 87% in the host matrix. Organic light-emitting diodes (OLEDs) containing AcPYM and PxPYM emitters realized external quantum efficiencies (η(ext)) of 16.8% for blue and green emissions.

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