Thermally activated delayed fluorescence molecules, materials comprising said molecules, and devices comprising said materials
US11725013B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2018 |
| Grant date | Aug 15, 2023 |
| Priority date | — |
| Expiry date | Mar 1, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K2101/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A thermally activated delayed fluorescence (TADF) molecule comprising: a central electron donor moiety, wherein the central electron donor moiety is formed of a conjugated multi-ring system comprising three nitrogen atoms; and three electron acceptor moieties, each bonded to the central electron donor moiety via one of the three nitrogen atoms, wherein at least one of the three electron acceptor moieties is twisted relative to the central electron donor moiety defining a torsion angle in a range 40° to <90° whereby the TADF molecule has a photoluminescence quantum yield of >60% and a rate of reverse intersystem crossing from a lowest excited triplet state to a lowest excited singlet state of at least 1×10 s−1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.