Abstract
Full-color smart displays, which act both as a display and as a high-speed visible light communication (VLC) transmitter, can be realized by the integration of red-green-blue micron-sized light emitting diodes (micro-LEDs) onto a common platform. In this work, we report on the integration of aluminum gallium indium phosphide red micro-LEDs onto diamond and glass substrates by micro-transfer printing and their application in VLC. The device on-diamond exhibits high current density and bandwidth operation, enabled by diamond's superior thermal properties. Employing an orthogonal frequency division multiplexing modulation scheme, error-free data rates of 2.6 Gbps and 5 Gbps are demonstrated for a single micro-LED printed on-glass and on-diamond, respectively. In a parallel configuration, a 2x1 micro-LED array achieves error-free data rates of 3 Gbps and 6.6 Gbps, on-glass and on-diamond, respectively.
Highlights
Micron-sized light emitting diodes are expected to become the nextgeneration of self-emissive displays and microdisplays [1]
Blue and green pixels are fabricated from indium gallium nitride (InGaN) alloys grown on sapphire or silicon substrates [4]
The red emission is based on aluminum gallium indium phosphide (AlGaInP) LED structures grown on gallium arsenide (GaAs) [5,6]
Summary
Micron-sized light emitting diodes (micro-LEDs or μLEDs) are expected to become the nextgeneration of self-emissive displays and microdisplays [1]. The red emission is based on aluminum gallium indium phosphide (AlGaInP) LED structures grown on gallium arsenide (GaAs) [5,6]. These inorganic micron-sized pixels exhibit exceptional brightness, contrast and low power consumption. Due to their smaller device capacitance and current density dependent differential carrier lifetime, micro-LEDs show extremely high modulation bandwidth, supporting visible light communication (VLC) up to several gigabits per second (Gbps) [7]. This opens the possibility for smart micro-LED displays acting both as a display and as a high-speed VLC transmitter [8]. The broader implication of this work include application of these red micro-LED devices with polymer optical fibers and/or high turbidity underwater wireless optical communication systems
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