Organic light-emitting device, and light-emitting material and compound used therefor
An organic light-emitting device having a light-emitting layer containing a compound represented by the general formula below has a high light emission efficiency. In the general formula, at least one of R 1 to R 5 represents a cyano group, at least one of R 1 to R 5 represents a 9-carbazolyl group, a 1,2,3,4-tetrahydro-9-carbazolyl group, a 1-indolyl group or a diarylamino group, and the balance of R 1 to R 5 represents a hydrogen atom or a substituent.
1. A compound represented by the following general formula (2):
wherein in the general formula (2), at least one of R 1l ,R 12 ,R 14 and R 15 represents a cyano group, at least three of R 11 to R 15 each represent a substituted or unsubstituted 9-carbazolyl group, a substituted or unsubstituted 1,2,3,4-tetrahydro-9-carbazolyl group, a substituted or unsubstituted 1-indolyl group or a substituted or unsubstituted diarylamino group, and the balance of R 11 to R 15 represents a hydroxy group, provided that R 12 is not a cyano group when R 14 is a cyano group.
2. An organic light-emitting device comprising a substrate having thereon a light-emitting layer containing a compound represented by the following general formula (1) and a host material:
wherein in the general formula (1), at least one of R 1 to R 5 represents a cyano group, at least one of R 1 R 5 represents a group represented by the following general formula (11), and the balance of R 1 to R 5 represents a hydrogen atom or a substituent;
wherein in the general formula (11), R 21 to R 28 each independently represent a hydrogen atom or a substituent, provided that at least one of the following requirements (A) and (B) is satisfied:
(A) R 25 and R 26 jointly form a single bond, and
(B) R 27 and R 28 jointly form an atomic group that is required for forming a substituted or unsubstituted benzene ring.
3. The organic light-emitting device according to claim 2 , which emits delayed fluorescent light.
4. The organic light-emitting device according to claim 2 , which is an organic electroluminescent device.