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Efficiency Enhancement and Color Stabilization in Organic Light-Emitting Devices Utilizing a Fullerene–Polymer Composite Layer Acting as a Hole Transport Layer

The electrical and optical properties of organic light-emitting devices (OLEDs) utilizing a nanopolymer composite layer consisting of fullerene (C60) and poly(2-methoxy-5-[2'-ethylhexyloxy]-p-phenylenevinylene) (MEH-PPV) were investigated. The current density of devices with a C60/MEH-PPV composite hole transport layer (HTL) was larger than that of devices without a composite HTL owing to the enhancement in the hole injection and transport. The luminance efficiency of the OLEDs utilizing a C60/MEH-PPV composite layer was significantly enhanced owing to an increase in the conductivity of the C60/MEH-PPV composite HTL. The recombination region in the center of the emitting layer for the device with a C60/MEH-PPV composite layer decreased the variation of color coordinates and enhanced the color stability, resulting in the realization of the highly efficient device.