Engineering Metal–Organic Frameworks with Tunable Colors for High-Performance Wireless Communication

Abstract

Metal–organic frameworks (MOFs) have emerged as excellent platforms possessing tunable and controllable optical behaviors that are essential in high-speed and multichannel data transmission in optical wireless communications (OWCs). Here, we demonstrate a novel approach to achieving a tunable wide modulation bandwidth and high net data rate by engineering a combination of organic linkers and metal clusters in MOFs. More specifically, two organic linkers of different emission colors, but equal molecular length and connectivity, are successfully coordinated by zirconium and hafnium oxy-hydroxy clusters to form the desired MOF structures. The precise change in the interactions between these different organic linkers and metal clusters enables control over fluorescence efficiency and excited state lifetime, leading to a tunable modulation bandwidth from 62.1 to 150.0 MHz and a net data rate from 303 to 363 Mb/s. The fabricated color converter MOFs display outstanding performance that competes, and in some instances surpasses, those of conventional materials commonly used in light converter devices. Moreover, these MOFs show high practicality in color-pure wavelength-division multiplexing (WDM), which significantly improved the data transmission link capacity and security by the contemporary combining of two different data signals in the same path. This work highlights the potential of engineered MOFs as a game-changer in OWCs, with significant implications for future high-speed and secure data transmission.

A fluorescence–phosphorescence dual-emissive Cu3(pyrazolate)3 complex with highly tunable emission colours for anticounterfeiting and temperature sensing

“…Widely adjustable emission colours are one of the most concerned aspects for advanced luminescent coordination assemblies, related to a series of intriguing applications, including solid-state lighting, full-colour flat-panel displays, sensors, information encryption, photonic communication, and optical memory. 1–12 To prevent the drawbacks of multiphase emitters ( e.g. , phase separation and colour variation), single-phase coordination materials with separated dual or multiple emission bands whose relative intensities are sensitive to external stimuli ( e.g.…”

Terbium-Doped CsPbI3 Glasses for High-Speed Visible-Light Communication

“…VLC has the following advantages: high license-free bandwidth ranging from 430 to 750 THz, resistance to electromagnetic interference, and ubiquitous light source availability. A diverse array of technologies and algorithms have been innovatively designed to enhance the quality of the signal, extend transmission distance, and increase capacity and throughput while simultaneously reducing power consumption. − Among them, the color-conversion technique enables high-speed communication with adjustable wavelengths and facilitates white-light communication, , wavelength-division multiplexing, , and omni-directional photodetection. , In this regard, halide perovskite quantum dots (QDs) have become one of the ideal candidates for color conversion applications in VLC systems due to their exceptional photoluminescence (PL) and short lifetime originating from the well-confined crystal structures. Although significant progress has been made by using blue or green perovskites for high-performance VLC, , the exploration of fast-acting red perovskites is still in its infancy.…”

“…A diverse array of technologies and algorithms have been innovatively designed to enhance the quality of the signal, extend transmission distance, and increase capacity and throughput while simultaneously reducing power consumption. 1−7 Among them, the color-conversion technique enables high-speed communication with adjustable wavelengths and facilitates white-light communication, 8,9 wavelength-division multiplexing, 10,11 and omni-directional photodetection. 12,13 In this regard, halide perovskite quantum dots (QDs) have become one of the ideal candidates for color conversion applications in VLC systems due to their exceptional photoluminescence (PL) and short lifetime originating from the well-confined crystal structures.…”

Leveraging Intermolecular Charge Transfer for High-Speed Optical Wireless Communication

“…As human society’s demand for communication systems and data transmission continuously grows, the prevailing broadband radiofrequency (RF)/microwave wireless technology encounters challenges in keeping pace with the evolving landscape, mainly due to spectrum congestion and limited bandwidth. − Nonetheless, the emergence of optical wireless communication (OWC) technology, offering secure, license-free bandwidth across the entire spectrum from ultraviolet (UV) to near-infrared (NIR), presents fresh opportunities for unobstructed growth in the realm of high-speed, low-latency data transmission. − Luminescent materials with short lifetimes play an important role in the OWC system, as they can serve as color converters that facilitate white-light generation, wavelength-division multiplexing/demultiplexing, , large-area wide-field-of-view light transmission/collection, optical beam tracking, etc., in various forms such as films, fibers, and liquid . However, conventional color-converting materials utilized for OWCs have primarily revolved around intricate organic, ceramic, and perovskite compositions.…”

“…Moreover, the incorporation of the charge transfer process typically reduces the luminescence lifetime in comparison to those of monomeric molecules, which proves advantageous for the −3 dB bandwidth in the OWC scenarios. It should be noted that the −3 dB bandwidth ( f –3 dB ) and the average luminescence lifetime (⟨τ⟩) are inversely correlated within a certain range, which can be approximately expressed as f –3 dB ≤ 1/(2π⟨τ⟩). ,, The underlying mechanism relies on the fact that the modulation bandwidth of a luminescent material is limited by its carrier recombination lifetime. A long luminescence lifetime indicates that the carriers take longer to recombine, limiting the speed at which the device can respond to modulation signals.…”