Wireless light energy harvesting and communication in a waterproof GaN optoelectronic system

Abstract

Wireless technologies can be used to track and observe freely moving animals. InGaN/GaN light-emitting diodes (LEDs) allow for underwater optical wireless communication due to the small water attenuation in the blue-green spectrum region. GaN-based quantum well diodes can also harvest and detect light. Here, we report a monolithic GaN optoelectronic system (MGOS) that integrates an energy harvester, LED and SiO2/TiO2 distributed Bragg reflector (DBR) into a single chip. The DBR serves as waterproof layer as well as optical filter. The waterproof MGOS can operate in boiling water and ice without external interconnect circuits. The units transform coded information from an external light source into electrical energy and directly activate the LEDs for illumination and relaying light information. We demonstrate that our MGOS chips, when attached to Carassius auratus fish freely swimming in a water tank, simultaneously conduct wireless energy harvesting and light communication. Our devices could be useful for tracking, observation and interacting with aquatic animals.

Unification of Irreversibility and Energy Diagram Theory

“…The EL and responsivity spectra show an approximate 50 nm wavelength overlap for the response to higher-energy photons, suggesting that the QW diode can detect and modulate photons emitted by itself. Two diodes sharing identical QW structures can be separately used as a transmitter and a receiver to form a wireless light communication system. − Gao et al monolithically integrated different diodes with identical QW structures into a single chip to produce a waterproof optoelectronic system, in which the QW diodes acted as a transmitter, a receiver, and an energy harvester. In particular, the simultaneous emission-detection phenomenon occurs when we shine a shorter-wavelength light beam onto the device and apply a forward voltage to it at the same time, providing a number of promising applications from full-duplex light communication to simultaneous illumination imaging.…”

Time-division multiplexing underwater light communication using two identical green quantum well diodes

“…Figure 3 For a QW diode, the EL spectrum partially overlaps with the responsivity spectrum, which is crucial to establish TDM VLC using two identical QW diodes. In reality, the QW diode can only detect, modulate and harvest shorter-wavelength light than that emitted by itself [22][23][24], which means that an irreversible process exists between light emission and detection of the device. It's of great interest to investigate the underlying mechanism of the dual emissiondetection characteristics and to answer what creates the partial spectral overlap.…”

Multilevel Simultaneous Lighting–Imaging System

“…Zhu et al discussed and summarized the recent two-dimensional materials. These studies involve biology, materials science, electronics, chemistry, and other disciplines, and an increasing number of studies are leading the development of modern display technology to a new stage. − However, there is seldom a way to give consideration to the advantages of both cost and versatility, which is a pain point and a blind spot for the current development of smart displays. , The development of the next generation of intelligent displays urgently requires dual-function devices. , Oh et al reported a double heterojunction nanorod device that can be used for simultaneous light emission and detection. Using a bifunctional perovskite diode, Shan et al proposed a bidirectional optical link between two identical devices.…”