Patent ID: 8048535

Claim:
An organic electroluminescent device comprising a pair of electrodes and a light emitting layer, a hole transport layer containing a hole transporting material, and an electron transport layer provided between the pair of electrodes wherein: all of the host materials in the light emitting layer are non-metal-complex compounds and at least one of the host materials in the light emitting layer is a compound having the formula (H-II) wherein: X E represents =N—Ra wherein Ra represents an aryl group; Z E represents an atomic group necessary to form a pyridine ring; B represents a benzene ring; and m is 3, and wherein the light emitting layer contacts the hole transport layer and contains at least two host materials and at least one red phosphorescent material which is an ortho-metalated iridium complex, the hole transporting material in the hole transport layer has a smaller ionization potential than the two host materials in the light emitting layer, and the at least one red phosphorescent material has a maximum emission wavelength of 550 to 700 nm.