Application of CdSe/ZnS/CdS/ZnS core-multishell quantum dots to modern OLED technology

Semiconductor quantum dots (QDs) obtained by means of colloidal synthesis are widely used in fabrication of organic light-emitting devices (OLEDs). We have fabricated QD-OLEDs with an active light-emitting layer formed by novel CdSe/ZnS/CdS/ZnS core-multishell QDs that have luminescence quantum yield of more than 90%. We have compared the performance of QD-OLEDs with different thickness of the active layer and demonstrated that the best performance is achieved at 45-55 nm, probably due to field redistribution inside the device. Optimization of the thicknesses of transport layers of QD-OLED is likely to further improve the performance of such devices. (C) 2016 Elsevier Ltd. All rights reserved.