Ultra‐Sensitive, Selective and Repeatable Fluorescence Sensor for Methanol Based on a Highly Emissive 0D Hybrid Lead‐Free Perovskite

Abstract

A convenient and rapid detection method for methanol in ethanol remains a major challenge due to their indistinguishable physical properties. Herein, a novel fluorescence probe based on perovskite was successfully designed to overcome this bottleneck. We report a new zero-dimensional (0D) hybrid perovskite of [MP] 2 In x Sb 1À x Cl 7 • 6 H 2 O (MP = 2methylpiperazine) displaying an unusual green light emission with near-unity photoluminescence quantum yield. Remarkably, this 0D perovskite exhibits reversible methanol-response luminescence switching between green and yellow color but fail in any other organic vapors. Even for blended alcohol solutions, the luminescent probe exhibits excellent sensing performance with multiple superiorities of rapid response time (30 s) and ultra-low detection limit (40 ppm), etc. Therefore, this 0D perovskite can be utilized as a perfect fluorescence probe to detect traces of methanol from ethanol with ultrahigh sensitivity, selectivity and repeatability. To the best of our knowledge, this work represents the first perovskite as fluorescence probe for methanol with wide potential in environmental monitoring and methanol detection, etc.

Tunable Emission of Low-Dimensional Organic Metal Halides by Stoichiometric Ratio and Metal Center

“…2 is a 3D structure (Figure S2a,b) and consists of transverse-layered octahedron (Figure S2c) and longitudinal chain octahedron (Figure S2d), which effectively increases the carrier transmission of the structure. 24 On the other hand, the gaps of 3D−OMH 2 structure contain disordered cations, and the disordered cations dissipate energy (detailed squeeze analysis is provided in the Supporting Information). 43 These greatly reduce the radiative transition of 3D−OMH 2, resulting in no fluorescence emission.…”

“…The unique “host–guest” structure of LD–OMHs, that is, the independent anionic metal halide polyhedron guest is regularly and orderly distributed in the mainframe formed by organic cations, ,,− which makes it rich chemical components with strong designability. When organic and inorganic module of LD–OMHs remain functional cooperation, and them with narrow-band emission will have great potential in the field of visualization sensing. − …”

A universal supramolecular assembly strategy for achieving efficient tunable white emission and anti-counterfeiting in antimony doped tin(iv)-based vacancy-ordered double perovskites

“…Therefore, the Sb 3+ -doping strategy can effectively shorten the forbidden band of the host matrix and provide the possibility of exciton transitions under photo-absorption, ultimately boosting the PL intensity of Sb 3+ -doped (AC) 2 SnCl 6 . 52…”

Ultrafast Visual Detection of a Trace Amount of Water by Highly Efficient Hybrid Manganese Halides

“…Compared with traditional analysis methods, portable sensor technology has attracted more attention due to its multiple advantages such as ease of manufacturing, miniaturization, low cost, fast response time, and real-time monitoring. − Compared with conventional electrochemical sensing methods, a visual fluorescence probe is capable of detecting water in a highly efficient, simple, and rapid way with high sensitivity and selectivity. − Until now, various kinds of semiconducting luminescent materials have been explored as fluorescence probes toward water including organic fluorophore, metal–organic complex, carbon dots, conjugated polymer, and rare-earth doped metal oxides, etc. − In recent years, organic–inorganic metal halides (OIMHs) have been demonstrated as new-generation luminescent materials owing to their excellent photoluminescence (PL) performance with ultrahigh quantum yield, excellent thermal stability, and low self-absorption performance in the state of aggregation, which have received increasing attention in solid-state display and lighting diodes. − Benefiting from the various kinds of organic species and enormous arrangement mode in the crystalline structure, the OIMHs display diverse and adjustable crystal structures, which further increase the possibility of colorful PL properties. − Especially, the weak bonding energy and soft structural scaffold of the ionic metal halide network enable the structures of OIMHs to be sensitive to various external physical and chemical stimuli including pressure, temperature, light, radiation, humidity, water, oxygen, pH, organic molecules, metal ions, etc. − As a result, these combined merits of abundant and impressible structures, facile structural transformation, and high sensitivity luminescence response toward external stimuli endow the OIMHs with various reversible and dynamic structure-associated PL switching phenomena, such as mechanochromism, thermochromism, photochromism, hydrochromism, vapochromism, etc. − Therefore, the OIMHs are capable of being explored as promising fluorescence probes for external stimuli with good selectivity and accuracy. For example, the zero-dimensional (0D) OIMH of [MP] 2 In x Sb 1– x Cl 7 ·6H 2 O single crystal exhibits a reversible and specific methanol-responsive luminescence switching, which can be used as a fluorescent probe to detect trace amounts of methanol in ethanol . In particular, some OIMHs display an impressive water-sensing switching performance with ultrahigh sensitivity.…”