Organic electroluminescent element and compounds for use in the element
An organic electroluminescent element comprises: a pair of electrodes; and one or more organic compound layers at least one of which is a light-emitting layer, the one or more organic compound layers being provided between the pair of electrodes, wherein at least one of the one or more organic compound layers comprises a compound represented by general formula (Z): wherein R 31 and R 32 each represents a hydrogen atom or a substituent, R 3A represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom, X 31 to X 38 each represents a substituted or unsubstituted carbon atom or a nitrogen atom, and Y 31 to Y 33 each represents a nitrogen atom or C—R 3B (wherein R 3B represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom).
1. An organic electroluminescent element comprising:
a pair of electrodes; and
one or more organic compound layers at least one of which is a light-emitting layer, the one or more organic compound layers being provided between the pair of electrodes,
wherein at least one of the one or more organic compound layers comprises a compound represented by general formula (Z):
wherein R 31 and R 32 each represents an alkyl group, a perfluoroalkyl group, an aryl group, a hetero ring group, an alkenyl group, an alkoxy group, an aryloxy group, an alkylamino group, an arylamino group, a hetero ring amino group, a silicon-containing hetero ring group, a silyl group, a hydroxyl group, a mercapto group, or a halogen atom, R 3A represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom, X 31 to X 38 each represents a substituted or unsubstituted carbon atom or a nitrogen atom, and Y 31 to Y 33 each represents a nitrogen atom or C—R 3B , wherein R 3B represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom.
2. The organic electroluminescent element as described in claim 1 ,
wherein the compound represented by the general formula (Z) is a compound represented by the following general formula (Z-2):
wherein R 31 and R 32 each represents an alkyl group, a perfluoroalkyl group, an aryl group, a hetero ring group, an alkenyl group, an alkoxy group, an aryloxy group, an alkylamino group, an arylamino group, a hetero ring amino group, a silicon-containing hetero ring group, a silyl group, a hydroxyl group, a mercapto group, or a halogen atom, R 33 to R 35 and R 3A each represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom, and X 31 to X 38 each represents a substituted or unsubstituted carbon atom or a nitrogen atom.
3. The organic electroluminescent element as described in claim 2 ,
wherein the compound represented by the general formula (Z-2) is a compound represented by the following general formula (Z-3):
wherein R 31 and R 32 each represents an alkyl group, a perfluoroalkyl group, an aryl group, a hetero ring group, an alkenyl group, an alkoxy group, an aryloxy group, an alkylamino group, an arylamino group, a hetero ring amino group, a silicon-containing hetero ring group, a silyl group, a hydroxyl group, a mercapto group, or a halogen atom, and R 33 to R 35 and R 3A each represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom.
4. The organic electroluminescent element as described in claim 1 ,
wherein the light-emitting layer comprises a compound capable of generating luminescence by a transition from a triplet excitation state thereof.
5. The organic electroluminescent element as described in claim 1 , wherein the compound represented by the general formula (Z) is contained in the light-emitting layer.
6. The organic electroluminescent element as described in claim 1 ,
wherein the compound represented by the general formula (Z) is contained in one of the organic compound layers which is adjacent to the light-emitting layer.
7. The organic electroluminescent element as described in claim 1 , wherein the lowest triplet energy level of the compound represented by the general formula (Z) is 65 kcal/mol or more.
8. The organic electroluminescent element as described in claim 1 , wherein R 31 and R 32 each represents an alkyl group or an aryl group.
9. A compound represented by the general formula (Z):
wherein R 31 and R 32 each represents an alkyl group or an aryl group, R 3A represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom, X 31 to X 38 each represents a substituted or unsubstituted carbon atom or a nitrogen atom, and Y 31 to Y 33 each represents a nitrogen atom or C—R 3B , wherein R 3B represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom.
10. A compound represented by the following general formula (Z-2):
wherein R 31 and R 32 each represents an alkyl group or an aryl group, R 33 to R 35 and R 3A each represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom, and X 31 to X 38 each represents a substituted or unsubstituted carbon atom or a nitrogen atom.
11. A compound represented by the following general formula (Z-3):
wherein R 31 and R 32 each represents an alkyl group or an aryl group, and R 33 to R 35 and R 3A each represents a substituent other than an aromatic hetero ring connected through a nitrogen atom, or a hydrogen atom.