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<SUP>-3 </SUP>cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1 </SUP>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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