We have investigated the effect of poly-TPD molecular weight (Mw) on the characteristics of CdSe/ZnS quantum-dot light-emitting devices (QD-LEDs). The poly-TPDs with Mw = 24000 and 84000 were used for hole-transporting layer. The Mw = 24000 poly-TPD layer was seriously dissolved by toluene which was used for the dispersion of QDs, resulting in substantial thickness reduction during the spin-coating of QD layer. The emission, external quantum efficiency, and driving characteristics of the QD-LEDs were investigated. A maximum external quantum efficiency of 2.1% was obtained in the QD-LED with Mw = 84000 poly-TPD layer.
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