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US 2018/0323394 A1Published application
Organic electroluminescent device emitting blue light
AssigneeCynora GmbH
InventorsAndreas HALDI, Georgios LIAPTSIS, Harald FLUEGGE, Patrick PINGEL, Stefan HOEFLE
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Abstract
The present invention relates to a an organic electroluminescent device comprising a light-emitting layer B comprising a host material HB, a first thermally activated delayed fluorescence (TADF) material EB, and a second TADF material SB, wherein SB transfers energy to EB and EB emits TADF with an emission maximum between 420 and 500 nm.
Claims17
1-15. (canceled)
An organic electroluminescent device comprising a light-emitting layer B comprising:
- (i) a host material HB, which has a lowermost excited singlet state energy level S1H and a lowermost excited triplet state energy level T1H;
- (ii) a first thermally activated delayed fluorescence (TADF) material EB, which has a lowermost excited singlet state energy level S1E and a lowermost excited triplet state energy level T1E;
- and
- (iii) a second TADF material SB, which has a lowermost excited singlet state energy level S1S and a lowermost excited triplet state energy level T1S,
- wherein SB transfers energy to EB and EB emits thermally activated delayed fluorescence with an emission maximum between 420 and 500 nm;
- and wherein the relations expressed by the following formulas (1) to (4) apply:
- S1H<S1E (1)
- S1H<S1S (2)
- S1E<S1S (3)
- T1H<T1S (4)
7 more elements
Dependencies are inferred from the claim text.