Improved performance of flexible white hybrid light emitting diodes by adjusting quantum dots distribution in polymer matrix

•Flexible hybrid white quantum dot light-emitting devices were fabricated.•The QDs distribution was controlled by adjusting PVK content in the hybrid layer.•The orange emission intensity can be enhanced by increasing PVK concentration.•The device can produce pure white light emission due to the presence of PVK.

A flexible hybrid white light emitting diode (LED), in which the CdSe/ZnS quantum dots (QDs) acted as an orange emitter and small organic molecules as the blue emitter in a multilayered structure was fabricated by spin-coating. The poly (N-vinylcarbazole) (PVK) was added in the emitting layer to adjust QDs distribution in polymer matrix. By increasing the concentration of PVK, the electroluminescent intensity at 610 nm emission was enhanced since QDs had a better dispersibility in polymer matrix with the presence of PVK, and a pure white light emission was obtained due to the optimized architecture of the hybrid active layer. Our study provides a novel method for improving the device performance of hybrid white LEDs by controlling the QDs distribution in the active layer.