Excited-state intramolecular proton-transfer (ESIPT)-inspired solid state emitters

Abstract

Solid state emitters based on excited state intramolecular proton transfer (ESIPT) have been attracting considerable interest since the past few years in the field of optoelectronic devices because of their desirable unique photophysical properties. The photophysical properties of the solid state ESIPT fluorophores determine their possible applicability in functional materials. Less fluorescence quantum efficiencies and short fluorescence lifetime in the solid state are the shortcomings of the existing ESIPT solid state emitters. Designing of ESIPT chromophores with high fluorescence quantum efficiencies and a long fluorescence lifetime in the solid state is a challenging issue because of the unclear mechanism of the solid state emitters in the excited state. Reported design strategies, detailed photophysical properties, and their applications will help in assisting researchers to overcome existing challenges in designing novel solid state ESIPT fluorophores for promising applications. This review highlights recently developed solid state ESIPT emitters with focus on molecular design strategies and their photophysical properties, reported in the last five years.

Spectroscopic Studies of Fluorescence Effects in Bioactive 4-(5-Heptyl-1,3,4-Thiadiazol-2-yl)Benzene-1,3-Diol and 4-(5-Methyl-1,3,4-Thiadiazol-2-yl)Benzene-1,3-Diol Molecules Induced by pH Changes in Aqueous Solutions

“…According to theories attempting at elucidation of the observed fluorescence effects, they can be related to appearance of intramolecular CT states [34] and the so-called TICT states (Twisted Intramolecular Charge Transfer) [35, 36]. Another explanation of the analysed phenomena is the process of Excited-State Intramolecular Proton Transfer ESIPT [37–42]. Other theories postulate formation of compound concentration-induced excimer systems [43, 44], various types of acid-base reactions in the investigated system, or very frequent formation of excited-state tautomeric systems [45, 46].…”

A new hydroxynaphthyl benzothiazole derived fluorescent probe for highly selective and sensitive Cu 2+ detection

“…ACCEPTED MANUSCRIPT 3 characteristic have attracted great attention in probe design due to their intriguing photophysical properties including dual wavelength emission and large Stokes shift [37][38][39]. 2-(2′-hydroxyphenyl)benzothiazole (HBT), as a typical ESIPT active fluorophore, has drawn considerable attention, and many HBT derived fluorescent probes based on modulating ESIPT have been extensively explored [40][41][42][43][44][45][46][47][48].…”

Resonance‐Assisted Hydrogen Bonding as a Driving Force in Synthesis and a Synthon in the Design of Materials

“…[303][304][305][306] ESIPT processes are among the fastest chemical reactions occurring in nature, [305][306][307][308] takingp lace on as ubpicosecond timescale, and have attracted much attention due to their applicationi nl uminescent materials, [309] molecular probes, [310] energy/data storage devices, [305] and optical switching. [305,313] In this section, we highlight RAHB!ESIPT!RAHB transitions, as well as the role of this process in molecular recognition,s olvatochromism, and liquid-crystalline materials. [312,313] Recently, the state-of-the-art development of the ESIPTc hromophores and their applications in biological imaging, chemosensors, and white-light emitting materials have been reviewed.…”