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Integration by self-aligned writing of nanocrystal/epoxy composites on InGaN micropixelated light-emitting diodes

Guilhabert, B.J.E. and Elfstrom, D. and Kuehne, A.J. and Massoubre, D. and Zhang, H.X. and Jin, S.R. and Mackintosh, A.R. and Gu, E. and Pethrick, R.A. and Dawson, M.D. (2008) Integration by self-aligned writing of nanocrystal/epoxy composites on InGaN micropixelated light-emitting diodes. Optics Express, 16. p. 18933. ISSN 1094-4087

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Abstract

We report on the integration of monodisperse semiconductor nanocrystal (NC) color converters onto gallium nitride ultraviolet micropixelated light-emitting diodes ('micro-LEDs'). Integration is achieved in a 'self-aligned' process by forming a nanocomposite of the respective NCs in a photocurable epoxy polymer. Blue, green, yellow and red NC/epoxy blend microstructures have been successfully integrated onto micro-pixelated LEDs by this technique and utilised for color conversion, resulting in a five color emission single chip. Optical output power density of up to about 166mW/cm2 is measured; spectral emission at 609nm gives an estimated optical-to-optical conversion as high as 18.2% at 30mA driving current.