Abstract
Double layer (DL) electroluminescent devices, made with TPD (75%) in polycarbonate (PC) and with a mixed ligand 8-quinolinolato aluminium chelate as electron transporting and emitting material, show higher electroluminescence (EL) quantum yield (2.2%) and an increased blue EL emission in comparison with Tris–(8-hydroxyquinolinate)Al(III) (Alq 3). The solid state photoluminescence (PL) quantum yield is as high as 60%, about five-fold the Alq 3 value. In spite of the high PL yield, EL efficiency is not as much high; this can be attributed to a strong electron mobility dependence on the electric field, which contributes to a slower increase with the field of the EL quantum yield.
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