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9-Borafluoren-9-yl and diphenylboron tetracoordinate complexes of F- and Cl-substituted 8-quinolinolato ligands: synthesis, molecular and electronic structures, fluorescence and application in OLED devices

Fialho, Carina B.; Cruz, Tiago F. C.; Rodrigues, Ana I.; Calhorda, Maria José; Vieira Ferreira, Luís F.; Dias, Fernando B.; Morgado, Jorge; Maçanita, António L.; Pander, Piotr; Gomes, Pedro T.

9-Borafluoren-9-yl and diphenylboron tetracoordinate complexes of F- and Cl-substituted 8-quinolinolato ligands: synthesis, molecular and electronic structures, fluorescence and application in OLED devices Thumbnail


Authors

Carina B. Fialho

Tiago F. C. Cruz

Ana I. Rodrigues

Maria José Calhorda

Luís F. Vieira Ferreira

Jorge Morgado

António L. Maçanita

Pedro T. Gomes



Abstract

Six new four-coordinate tetrahedral boron complexes, containing 9-borafluoren-9-yl and diphenylboron cores attached to orthogonal fluorine- and chlorine-substituted 8-quinolinolato ligand chromophores, have been synthesised, characterised, and applied as emitters in organic light-emitting diodes (OLEDs). An extensive steady-state and time-resolved photophysical study, in solution and in the solid state, resulted in the first-time report of delayed fluorescence (DF) in solid films of 8-quinolinolato boron complexes. The DF intensity dependence on excitation dose suggests that this emission originates from triplet–triplet annihilation (TTA). Density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies give insight into the ground and excited state geometries, electronic structures, absorption energies, and singlet–triplet gaps in these new organoboron luminophores. Finally, given their highly luminescent behaviour, organic light-emitting diode (OLED) devices were produced using the synthesised organoboron compounds as emissive fluorescent dopants. The best OLED displays green-blue (λmaxEL = 489 nm) electroluminescence with an external quantum efficiency (EQE) of 3.3% and a maximum luminance of 6300 cd m−2.

Journal Article Type Article
Acceptance Date Mar 10, 2023
Online Publication Date Mar 10, 2023
Publication Date 2023
Deposit Date Nov 7, 2023
Publicly Available Date Nov 7, 2023
Journal Dalton Transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 52
Issue 15
Pages 4933-4953
DOI https://doi.org/10.1039/d3dt00496a
Public URL https://durham-repository.worktribe.com/output/1900198

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