Abstract
Integrated multi-color micron-sized light emitting diode (micro-LED) arrays have been demonstrated in recent years for display applications; however, their potential as visible light communication (VLC) transmitters is yet to be fully explored. In this work, we report on the fabrication and characterization of on-chip dual-color micro-LED arrays and their application in VLC. For this purpose, blue-green and blue-violet micro-LED arrays were fabricated by transfer printing blue-emitting micro-LEDs onto the substrate of green and violet micro-LEDs, respectively. The potential of these dual-color micro-LED arrays as VLC transmitters is demonstrated with respective error-free data rates of 1.79 and 3.35 Gbps, achieved by the blue-green and blue-violet devices in a dual wavelength multiplexing scheme.
Highlights
The interest in gallium nitride (GaN)-based micron-sized light emitting diodes, of lateral dimension smaller than 100 μm, has increased dramatically in recent years [1]
GaN-based micro-LEDs offer exceptional brightness, contrast, fast response time, long operation lifetime, and low power consumption, which have facilitated their application in several fields, such as microdisplays [2,3,4], visible light communication (VLC) [5,6], fluorescence sensing [7], and optoelectronic tweezing [8]
Their success has been attributed to their hundreds of MHz -6 dB electrical modulation bandwidth combined with spectrally efficient modulation schemes, such as orthogonal frequency division multiplexing (OFDM) [19]
Summary
The interest in gallium nitride (GaN)-based micron-sized light emitting diodes (micro-LEDs), of lateral dimension smaller than 100 μm, has increased dramatically in recent years [1]. This has pushed research into strategies of suspending releasable ultrathin micro-LED platelets (still tethered to their growth substrate) and subsequent assembly by transfer printing (TP) techniques [13,14] Following this approach, several reports of TP-enabled multi-color inorganic micro-LED arrays, targeting microdisplay applications, have emerged [15,16,17]. Monochromatic GaN-based micro-LEDs have been successfully demonstrated as multi-Gbps VLC transmitters [18,19,20] Their success has been attributed to their hundreds of MHz -6 dB electrical modulation bandwidth combined with spectrally efficient modulation schemes, such as orthogonal frequency division multiplexing (OFDM) [19]. The communication capacity can be increased by using different color emitting micro-LEDs and wavelength division multiplexing (WDM) techniques This concept has been successfully implemented in a multi-Gbps VLC link using separate micro-LED chips of different colors [21]. These results show the potential for micro-LED arrays that act both as a display and as a high-speed VLC transmitter
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