Organic electroluminescent devices

摘要

Disclosed is an electroluminescent device comprising a cathode and an anode; and, located therebetween, a light-emitting layer (LEL) comprising a phosphorescent green-light-emitting material and a host material for the light-emitting material, and in a layer adjacent to the LEL on the anode side, an exciton-blocking layer containing a compound having a hole mobility of at least 1x10^-3 cm²V^-1s^-1 and a triplet energy exceeding that of the green-light-emitting material of the LEL. Such a device provides useful light emission.