We here report a warm white light-emitting diode (WLED) by employing the red-emitting liquid layer of AgInS2/ZnS quantum dots (QDs) over the yellow-emitting YAG:Ce phosphor-based WLEDs. Compared to the commercial WLEDs, our liquid-type QD-WLEDs exhibit a color temperature of 3500 K and an improved color rendering index of 85. In addition, the experimental results indicate that the liquid structure warm white light device has a higher luminous efficiency of 72.1 lm/W and a better color stability against the extended working time in comparison to the solid-type QD-WLEDs. (C) 2016 Elsevier B.V. All rights reserved.