However, for full exploitation of the available visible light spectrum, the opto-electrical conversion efficiency at ultra-high electrical bandwidth remains a fundamental challenge. This paper presents a new 2x2 micro LED array that provides an effective solution to the quantum-confined Stark effect, which typically reduces the emission efficiency under high injected current densities. It also leads to a spectral shift that reduces the possible gains of wavelength division multiplexing due to the wide emission spectrum. This issue is elegantly reduced. Moreover, due to the segmented design of the device the electrical 3-dB bandwidth is 800 MHz which constitutes a major improvement. It is envisaged that with enhanced digital modulation techniques, this device could be able to achieve data rates close to 10 Gbps.
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