Light-emitting material, and organic electroluminescent device
View Patent ↗To provide a light-emitting material containing a compound having a high excitation triplet level, particularly a host material of a light emitting layer, as a material for an organic electroluminescent device with high efficiency, and also to provide an organic electroluminescent device with high efficiency and high luminance by using the material. A light-emitting material containing a compound having a carbazole ring structure represented by the following general formula (1), and an organic electroluminescent device containing a pair of electrodes and one layer or plural layers including at least a light emitting layer intervening between the electrodes, the light emitting layer containing as a constitutional material thereof the light-emitting material.
1. An organic electroluminescent device comprising a pair of electrodes and one layer or plural layers including at least a light emitting layer intervening between the electrodes, the light emitting layer containing as a host material thereof a light-emitting material comprising a compound having a carbazole ring structure represented by the following general formula (1):
wherein A 1 and A 2 may be the same or different, and each represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon or a divalent group of a substituted or unsubstituted condensed polycyclic aromatics;
A 3 represents a divalent group of a substituted or unsubstituted aromatic hydrocarbon, a divalent group of a substituted or unsubstituted condensed polycyclic aromatics, or a single bond; B represents a substituted or unsubstituted pyridyl, bipyridyl, terpyridyl, pyrimidinyl, pyrazinyl, pyridazinyl, triazinyl, pyrrolyl, pyrazolyl, imidazolyl, triazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, oxadiazolyl, thiadiazolyl, fury!, thienyl, quinolyl, isoquinolyl, quinoxalinyl, quinazolinyl, naphthyridinyl, indolyl, isoindolyl, benzoimidazolyl, benzotriazolyl, benzofuranyl, benzothienyl, benzoxazolyl, benzoxadiazolyl, benzothiazolyl, benzothiadiazolyl, pyridopyrrolyl, pyridoimidazolyl, pyridotriazolyl, pteridinyl, acridinyl, phenazinyl, phenanthrolinyl, phenoxazinyl, phenothiazinyl, phenocelenazinyl, phenotellurazinyl, phenophosphinazinyl, carbolinyl, dibenzofuranyl, dibenzothienyl, or xanthenyl;
and R 1 to R 15 may be the same or different, and each represents a hydrogen atom, a deuterium atom, a fluorine atom, a chlorine atom, cyano, nitro, linear or branched alkyl of 1 to 20 carbon atoms that may have a substituent, cycloalkyl of 5 to 10 carbon atoms that may have a substituent, linear or branched alkenyl of 2 to 20 carbon atoms that may have a substituent, linear or branched alkyloxy of 1 to 20 carbon atoms that may have a substituent, cycloalkyloxy of 5 to 10 carbon atoms that may have a substituent, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aromatic heterocyclic group, a substituted or unsubstituted condensed polycyclic aromatic group, a substituted or unsubstituted aryloxy group, or a disubstituted amino group substituted with an aromatic hydrocarbon group, an aromatic heterocyclic group, or a condensed polycyclic aromatic group, and may bind to each other via a single bond, a substituted or unsubstituted methylene, an oxygen atom, or a sulfur atom, to form a ring and wherein the organic electroluminescent device emits delayed fluorescence.
2. The organic electroluminescent device according to claim 1 , wherein in the general formula (1), A 1 represents phenylene.
3. The organic electroluminescent device according to claim 1 , wherein in the general formula (1), A 2 represents phenylene.
4. The organic electroluminescent device according to claim 1 , wherein in the general formula (1), A 3 represents phenylene.
5. The organic electroluminescent device according to claim 2 , wherein in the general formula (1), A 3 represents phenylene.
6. The organic electroluminescent device according to claim 3 , wherein in the general formula (1), A 3 represents phenylene.
7. The organic electroluminescent device according to claim 1 , wherein in the general formula (1), A 3 represents a single bond.
8. The organic electroluminescent device according to claim 2 , wherein in the general formula (1), A 3 represents a single bond.
9. The organic electroluminescent device according to claim 3 , wherein in the general formula (1), A 3 represents a single bond.
10. The organic electroluminescent device according to claim 1 , wherein in the general formula (1), A 3 represents biphenylene.
11. The organic electroluminescent device according to claim 2 , wherein in the general formula (1), A 3 represents biphenylene.
12. The organic electroluminescent device according to claim 3 , wherein in the general formula (1), A 3 represents biphenylene.