Hybrid microcavity light emitting devices by additive manufacturing

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This project seeks to develop new and more efficient light emitting optoelectronic devices such as LEDs, with emission wavelengths tuneable over the visible spectrum including the current gaps in green and yellow. In order to achieve this, optical microcavity devices will be fabricated with semiconductor materials suspended between mirrors to make use of so called 'strong coupling' effects, bringing two different classes of semiconductor materials together in precisely controlled micro-structures the same size as the wavelength of light. Work will focus on combining gallium nitride based semiconductor materials and other families of semiconductor materials such as colloidal quantum dots and light emitting polymers in optical micro-cavity structures leading to potentially higher efficiency LEDs and lasers in the future.While the study of these coupling effects has previously required specialist and one-off fabrication approaches in laboratory conditions, this project aims to develop and employ manufacturing capable large scale processes to create these hybrid microcavity LEDs. New techniques will be developed to remove III-nitride LEDs from their growth wafers before employing the additive manufacturing process of transfer printing. This will be used to build hybrid material microcavities by stacking optimized complimentary materials together in a precisely controlled manner. Bringing these different materials together by additive manufacturing allows optimized, high efficiency components to be combined without compromises normally required due to the different processing temperatures and environments for different materials systems.