Simultaneous Illumination‐Imaging

Abstract

Micro multiple quantum well (MQW) III‐nitride diodes usually function as micro light‐emitting diodes, which are considered the next generation of display technology. In addition to both illumination and display, MQW III‐nitride diodes in theory have the capability to both detect and modulate light. Here, proof that the III‐nitride diode can simultaneously emit and detect light is experimentally confirmed by a wireless light communication system using two identical devices. The 20 × 20 MQW III‐nitride diodes are monolithically integrated into a single chip and a real‐time imaging system of transmitted images is established, which in practice can perform display, illumination, imaging, and simultaneous illumination‐imaging operations. These functions can be software controlled and switched freely. This work may lead to a multifunctional display that merges millions of III‐nitride diodes together to perform these functions at the same time.

Multilevel Simultaneous Lighting–Imaging System

“…Using a bifunctional perovskite diode, Shan et al proposed a bidirectional optical link between two identical devices. Some studies have shown that MQW diodes can not only be used for lighting and displays in the traditional sense but can also be used for the modulation and perception of light, which is termed the simultaneous emission-detection phenomenon. − Based on this phenomenon, we have confirmed that the communication performance of such diodes meets the requirements of duplex video transmission, and after large-scale integration, optical signals containing on–off information can be scanned and detected . With the advent of the era of high-speed communication, optical communication technology, a supplementary means of communication, has also made great progress. − The information exchange in this work is based on light, so it is suitable for the experimental scheme of traditional optical communication.…”

Experimental Demonstration and Theoretical Analysis of Simultaneous Emission–Detection Phenomenon

“…Consequently, the QWD array can be developed as a multifunctional display to simultaneously realize display and imaging. 28 …”

“…Consequently, the QWD array can be developed as a multifunctional display to simultaneously realize display and imaging. 28 At this point, one interesting question arises: why can the device only detect shorter-wavelength photon than that emitted by itself? Combining the energy diagram theory and the second law of thermodynamics, we try to explain the physics of the irreversibility of the spectral emission−detection overlap.…”

“…A proof of concept of the simultaneous emission–detection operation is experimentally illustrated in Visualization 1 of the Supporting Material. Consequently, the QWD array can be developed as a multifunctional display to simultaneously realize display and imaging …”

Unification of Irreversibility and Energy Diagram Theory

“…Both the injected electrons and the released electrons accumulate together inside the QW diode and are translated into dynamic electrical signals for full-duplex optical communication 20 and simultaneous illumination imaging. 21 However, the obtained results still directly lead to the following question: why does the QW diode only detect, modulate, and harvest higher-energy photons than those emitted by itself in reality, 22 indicating that light excitation is irreversible to light emission? Here, we use two identical QW diode units to establish a wireless light communication system and investigate the irreversibility between light emission and light excitation in the QW diode to reveal the physical mechanism behind this behavior.…”