Compound for organic electroluminescent device and organic electroluminescent device using the same
View Patent ↗Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, fully secured of driving stability, and of simple structure. The organic EL device comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the light-emitting layer comprises a phosphorescent dopant and a compound containing carbazolyl groups at both ends represented by the following formula (1) as a host material. In formula (1), X is independently CH optionally containing a substituent or N and L is a direct bond, an ethylene group, or an acetylene group.
1. An organic electroluminescent device comprising an anode, organic layers, and a cathode piled one upon an on a substrate, wherein said organic layers comprise a light-emitting layer comprising a compound for organic electroluminescent device represented by general formula (1) and a phosphorescent dopant:
wherein Ar is a divalent aromatic hydrocarbon group of 6 carbon atoms optionally containing substituents and the substituents are selected from the group consisting of a phenyl group, and an alkyl group of 1-4 carbon atoms;
L is a direct bond;
X is a methine group;
R is a hydrogen atom; and
n is an integer of 1;
wherein in the case where L is a direct bond, not all of the bonds between L and Ar are located at the adjacent position in the aromatic rings constituting Ar.
2. An organic electroluminescent device as described in claim 1 , wherein the compound for organic electroluminescent device is a compound represented by general formula (2):
wherein n, X, and R respectively have the same meanings as in general formula (1), with the proviso that R bonded to ring A is a hydrogen atom, a phenyl group, or an alkyl group of 1-4 carbon atoms; and
two bonds linking the adjacent rings are not located at the ortho position of ring.
3. An organic electroluminescent device as described in claim 1 , wherein the compound for organic electroluminescent device is a compound selected from the group consisting of the following compounds: