Electroluminescence from ZnCuInS/ZnS quantum dots/poly(9-vinylcarbazole) multilayer films with different thicknesses of quantum dot layer

Publication date: May 2017
Source:Journal of Physics and Chemistry of Solids, Volume 104
Author(s): Xiaofei Dong, Jianping Xu, Shaobo Shi, Xiaosong Zhang, Lan Li, Shougen Yin
We report tunable electroluminescence (EL) from solution-processed ZnCuInS/ZnS (ZCIS/ZnS) quantum dots (QDs)/poly(9-vinlycarbazole) multilayer films. The EL spectra exhibit a red shift as the QD layer thickness increases. By analyzing the dependence of the applied voltage and the ZCIS/ZnS QD layer thickness on the EL spectra, the origin of the red shift is associated with the increased trap density of QDs that induces the injected electrons to be trapped in the deep donor level. The current conduction mechanism based on the current density–voltage curves at different voltage regions was discussed.



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