Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue
Figure 1
Schematic illustrations of the device structure, in terms of energy-levels, of the color temperature tunable OLED devices composing three black body radiation complementary emitters, namely, red, yellow, and blue, dispersed in two emissive layers (EMLs) (a) without any hole modulation layer, and (b) with an extra nanoscale hole modulating layer with an energy barrier of 0.7 eV at the interface between the orange and blue EMLs. Nevertheless, there still exists a 0.2 eV hole injection barrier in Device (a) between the hole transporting layer and the host of the first EML, which could hence effectively regulate the injection of hole and in turn the shifting of recombination zone.
