Patent ID: 7635946

Claim:
An organic electroluminescent device comprising: a pair of electrodes; an organic compound layer between the pair of electrodes, the organic compound layer comprising: a hole transport layer; a light emitting layer; a block layer; and an electron transport layer, wherein the block layer comprises: an electron transport material; and an electrically inactive organic compound capable of being subjected to dry film formation, the electrically inactive organic compound having an energy difference Eg between a highest occupied molecular orbital and a lowest unoccupied molecular orbital of 4.0 eV or more, wherein the electrically inactive organic compound is a compound represented by formula (1): L—(Ar) m Formula (1) wherein Ar represents a group represented by formula (2); L represents a trivalent or tetravalent benzene skeleton; and m represents an integer of 3 or 4: wherein R 1 represents a substituent; when plural R 1 s are present, the plural R 1 s are the same or different; and n 1 represents an integer of from 0 to 4, and wherein R 3 represents a substituent; when plural R 3 s are present, the plural R 3 s are the same or different; and n 3 represents an integer of 0, and wherein the electrically inactive organic compound has a triplet excited state having a lowest energy level T1 of 2.7 eV or more.