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US 12,163,074 B2Granted
Host material, composition, and organic electroluminescent element
AssigneeKyulux, Inc.
InventorHiroaki Ozawa
Life of this patent
Estimating the term…
Abstract
To improve the emission efficiency, the driving voltage and the lifetime of an organic light-emitting device using a delayed fluorescent material. A host material for a delayed fluorescent material, containing a compound represented by the following general formula: R1 to R5 each are a substituent not containing a cyano group, n1 to n5 each are 0 to 4, Ar is a monocyclic arylene group or a monocyclic heteroarylene group.
Claims18
A host material for use along with a delayed fluorescent material, comprising a compound having a structure represented by the following formula (1):
- wherein R1 to R5 each independently represent a deuterium or a substituent having a Hammett's op value that falls within a range of −0.3 to 0.3, R1 to R5 do not bond to the other R1 to R5 or Ar to form a cyclic structure, but neighboring R3's can bond to each other to form a benzofuro structure or a benzothieno structure;
- n1, n3 and n5 each independently represent an integer of any of 0 to 4, n2 represents an integer of any of 0 to 3, n4 represents an integer of any of 0 to 2;
- X represents an oxygen atom or a sulfur atom;
- Ar represents a monocyclic arylene group or a monocyclic heteroarylene group, and the monocyclic arylene group and the monocyclic heteroarylene group are unsubstituted or are substituted with at least one group consisting of deuterium or an alkyl group.
1 more element
Dependencies are inferred from the claim text.