| 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 1 x 10-3cm^2V-1S-1 and a triplet energy exceeding that of the green-light-emitting material of the LEL. Such a device provides useful light emission.
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