Highly integrated surface ligand platform for multifunctional polymer nanocomposites and their applications in LED lighting

Abstract

The last part of this thesis demonstrates exciting implications of the highly integrated surface ligand system for advanced LED lighting applications. Compared to commercial silicone encapsulants, significant light extraction enhancement has been obtained for red and green LEDs encapsulated with the transparent high-RI ZrO2/silicone nanocomposites. The nanocomposite-encapsulated green and blue LEDs exhibit high reliability within 1000 hours at up to 1 A driving current. In addition, the spectrum of a blue LED encapsulated with dye-functionalized NPs can be adjusted from yellowish green to near pure white. Approaches providing confinement against free motions of the conjugated structure of dye molecules were adopted to enhance the stability of the dye-functionalized NPs.