Journal ArticleDOI
Fine Tuning the Energetics of Excited-State Intramolecular Proton Transfer (ESIPT): White Light Generation in A Single ESIPT System
Kuo-Chun Tang,Ming-Jen Chang,Tsung-Yi Lin,Hsiao-An Pan,Tzu-Chien Fang,Kew-Yu Chen,Wen-Yi Hung,Yu-Hsiang Hsu,Pi-Tai Chou +8 more
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TLDR
The results provide the proof of concept that the white light generation can be achieved in a single ESIPT system.Abstract:
Using 7-hydroxy-1-indanone as a prototype (I), which exhibits excited-state intramolecular proton transfer (ESIPT), chemical modification has been performed at C(2)-C(3) positions by fusing benzene (molecule II) and naphthalene rings, (molecule III) I undergoes an ultrafast rate of ESIPT, resulting in a unique tautomer emission (λ(max) ∼530 nm), whereas excited-state equilibrium is established for both II and III, as supported by the dual emission and the associated relaxation dynamics The forward ESIPT (normal to proton-transfer tautomer species) rates for II and III are deduced to be (30 ps)(-1) and (22 ps)(-1), respectively, while the backward ESIPT rates are (11 ps)(-1) and (48 ps)(-1) The ESIPT equilibrium constants are thus calculated to be 037 and 22 for II and III, respectively, giving a corresponding free energy change of 059 and -047 kcal/mol between normal and tautomer species For III, normal and tautomer emissions in solid are maximized at 435 and 580 nm, respectively, achieving a white light generation with Commission Internationale de l'Eclairage (CIE) (030, 027) An organic light-emitting diode based on III is also successfully fabricated with maximum brightness of 665 cd m(-2) at 20 V (885 mA cm(-2)) and the CIE coordinates of (026, 035) The results provide the proof of concept that the white light generation can be achieved in a single ESIPT systemread more
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Multiple strategies towards high-efficiency white organic light-emitting diodes by the vacuum deposition method
Hui Liu,Futong Liu,Ping Lu +2 more
TL;DR: In this article, the basic working mechanism and performance evaluation of WOLEDs are introduced and summarized according to the sequence of all phosphorescent, hybrid, fluorescent, doping-free, single-emitter, and TADF materials.
Journal ArticleDOI
An extended excited-state intramolecular proton transfer (ESIPT) emitter for random lasing applications
Julien Massue,Abdellah Felouat,Pauline M. Vérité,Denis Jacquemin,Konrad Cyprych,Martyna Durko,Lech Sznitko,Jaroslaw Mysliwiec,Gilles Ulrich +8 more
TL;DR: This study constitutes the first observation of RL based on ESIPT fluorescence, and shows the presence of stimulated emission occurring above the threshold level of pumping energy density in the PMMA matrix.
Journal ArticleDOI
Identifying the Role of Intramolecular Charge Transfer and Excited-State Proton Transfer in Fluorescence Mechanism for an Azido-Based Chemosensor
TL;DR: In this paper, the fluorescence enhancement mechanism of H2S chemosensor 2-(2-azidophenyl)-1-(p-tolyl)-1H-phenanthro[9,10-d]imidazole (P-N3) has been investigated in detail by the density fun...
Journal ArticleDOI
Atypical energetic and kinetic course of excited-state intramolecular proton transfer (ESIPT) in room-temperature protic ionic liquids.
TL;DR: The excited-state intramolecular proton-transfer process in 1,8-dihydroxyanthraquinone (18DHAQ) dye has been investigated in protic ionic liquid (PIL) solvents using photochemical measurements, and observation of solvent-viscosity-dependent back ESIPT is an intriguing finding.
Journal ArticleDOI
Benzothiazoles-substituted tetraphenylethylenes: synthesis, structure, aggregation-induced emission and biological studies
TL;DR: In this paper, a tetraphenylethylene (TPE) bearing benzothiazoles at the ortho-position to OH and OCH3 groups, 1a and 1b, respectively, were prepared.
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