ELECTROLUMINESCENT DIODES UTILIZING BLENDS OF POLYMERS

摘要

Blends of luminescent polymer in a matrix of hole transporting polymer serve as active layers (14) in LEDs (10). The use of polymer blends reduces the amount of costly luminescent polymer employed, leads to higher efficiencies and causes wavelength shifts in the emitted light as compared to homopolymer based active layers. The color shift allows color tuning and permits high efficiency blue LEDs to be obtained. Methods for forming the blends and methods for using them in LEDs (10) are also disclosed.