Design, fabrication and optimization of III-nitride micro light emitting diodes for optical communication

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Abstract

The work presented in this thesis focuses on the development and optimization of III-nitride micro-structured light emitting diodes (µLEDs) for optical communications in free space. The main body of this work is divided into two parts. The first part is focused on the development and optimization of blue and violet series-biased µLEDs and blue µLEDs arrays with individually addressable n-electrodes for free space visible light communication (VLC). The second part demonstrates the development of deep ultraviolet (UV) µLED and its application in free space deep UV communication. In this work, a new series-biased µLED is introduced, enabling high optical power without sacrificing too much 6-dB electrical modulation bandwidth. Over 10 Gbps data transmission rates are achieved using such µLEDs in long distance VLC. Furthermore, a new n-type metal-oxide-semiconductor (NMOS) driver controlled µLED array is introduced along with its VLC application. The design and fabrication process of this device are given in detail. The performances of the µLED array with an integrated NMOS driver are presented. Based on the novel III-nitride deep UV µLEDs developed in this work, a record deep UV data transmission rate of 3.36 Gbps is achieved at a bit error rate (BER) of 3.8 x 10⁻³ under orthogonal frequency division multiplexing (OFDM) modulation schemes.

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Design, fabrication and optimisation of III-nitride micro light emitting diodes for optical communication

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