Color control of multilayer stacked white polymer light-emitting diodes using a quantum dot as an interlayer

Color tunable multilayer stacked white polymer light-emitting diodes (WPLEDs) have been developed using a quantum dot as an interlayer. Multilayer WPLEDs were fabricated by a stamp transfer printing method and the charge transport of WPLEDs could be controlled by the quantum dot interlayer. The use of the quantum dot as the interlayer shifted the color coordinate of blue/yellow stacked WPLEDs from (0.34, 0.41) to (0.41, 0.48). The electron trapping effect of the quantum dot was responsible for the color shift in the multilayer stacked WPLEDs.