In:
Chemistry – A European Journal, Wiley, Vol. 25, No. 7 ( 2019-02), p. 1829-1834
Abstract:
Molecular design principles of thermally activated delayed fluorescent (TADF) emitters having a high quantum efficiency and a color tuning capability was investigated by synthesizing three TADF emitters with donors at different positions of a benzonitrile acceptor. The position rendering a large overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) enhances the quantum efficiency of the TADF emitter. Regarding the orbital overlap, donor attachments at 2‐ and 6‐positions of the benzonitrile were more beneficial than 3‐ and 5‐substitutions. Moreover, an additional attachment of a weak donor at the 4‐position further increased the quantum efficiency without decreasing the emission energy. Therefore, the molecular design strategy of substituting strong donors at the positions allowing a large molecular orbital overlap and an extra weak donor is a good approach to achieve both high quantum efficiency and a slightly increased emission energy.
Type of Medium:
Online Resource
ISSN:
0947-6539
,
1521-3765
DOI:
10.1002/chem.201805616
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1478547-X
