White electroluminescent devices based on hybrid structure with quantum dot color convertors

In this work, a hybrid structure of white electroluminescent (EL) devices has been designed. CdSe/ZnS core-shell quantum dots (QDs) are introduced as color convertors. The photometric and colorimetric characteristics of this device are further experimentally investigated with varying frequency and voltage. Compared with that of conventional white EL devices, this novel device achieves a twice luminance and more stable white light. Moreover, the concept of “color conversion index” is proposed to measure the color conversion ability of QDs in EL devices in consideration of human visual effect.