Organic electroluminescent device having triptycene derivative material

摘要

Disclosed is a useful organic EL device which comprises a phosphorescent light-emitting layer and is endowed with improved luminous efficiency and high driving stability. Also disclosed is a hole-transporting material suitable for use in the phosphorescent light-emitting device. The hole-transporting material is a triptycene derivative which has substituents at the 9- and 10-positions and is substituted with an aromatic group containing at least one diarylamino group (—ArNAr2). The organic EL device contains the triptycene derivative in at least one organic layer selected from the group of a phosphorescent light-emitting layer, a hole-transporting layer, an electron-blocking layer, and an exciton-blocking layer. The diarylamino group (—NAr2) may be fused to form an aromatic heterocyclic group such as a carbazolyl group.

主权项

1. An organic electroluminescent device comprising an anode, organic layers containing a phosphorescent light-emitting layer, and a cathode piled one upon another on a substrate wherein the organic layer of the phosphorescent light-emitting layer comprises a triptycene derivative represented by general formula (1): wherein in general formula (1), A1 to A5 each is independently a substituent represented by formula (2); a, b, and c each is an integer of 0-2 and 0≦a+b+c≦3; and R1 and R2 each is independently hydrogen, an alkyl group of 1-10 carbon atoms, an alkoxyl group of 1-6 carbon atoms, or an acyl group of 2-6 carbon atoms; wherein in formula (2), n is an integer of 0-1 and the sum of n's in general formula (1) is an integer of 1; L is a group derived from benzene, pyridine, or pyrimidine; and Ar1 and Ar2 each is independently an aromatic hydrocarbon group of 6-18 carbon atoms or an aromatic heterocyclic group of 3-17 carbon atoms, and Ar1, Ar2 and the nitrogen atom together optionally form a nitrogen-containing heterocycle.