Near-infrared phosphorescence: materials and applications

Xiang, Haifeng; Cheng, Jinghui; Ma, Xiaofeng; Zhou, Xiangge; Chruma, Jason J.

doi:10.1039/c3cs60029g

Cited by 584 publications

(465 citation statements)

References 477 publications

(419 reference statements)

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“…[1][2][3][4][5][6][7][8][9][10][11] Appropriate functionalization of these compounds make them solution processable and allows for precise tuning of their electronic, spectroscopic, electrochemical and mechanical properties. For example, molecules exhibiting high electron affinity (|EA|>3.9 eV) due to their low lying LUMO level are good candidates for the fabrication of air operating n-channel FETs.…”

Section: Introductionmentioning

confidence: 99%

Symmetrically Disubstituted Bithiophene Derivatives of 1,3,4-Oxadiazole, 1,3,4-Thiadiazole, and 1,2,4-Triazole – Spectroscopic, Electrochemical, and Spectroelectrochemical Properties

et al. 2014

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Electrochemical and spectroelectrochemical properties of a series of new penta-ring donor -acceptor compounds, comprising 1,3,4-oxadiazole, 1,3,4-thiadiazole and 1,2,4-triazole central ring, symmetrically connected to substituted bithiophenes, were investigated. Aromaticity and electrophilic -nucleophilic traits of the aza-heterocyclic units, fostering inductive and resonance effects that translate to conjugation enhancement and electron (de)localization, were found a major factor determining the key electron properties of ionization potential (IP) and electron affinity (EA) of these molecules. Replacing the alkyl thiophene substituent for an alkoxy one, afforded certain control over the two parameters as well. All studied compounds were found to undergo electrochemical polymerization giving p and n-dopable products, featuring good electrochemical reversibility of their oxidative doping process, as demonstrated by cyclic voltammetry and UV-Vis-NIR, EPR spectroelectrochemistry. While electropolymerisation of entities differing in the heterodiazole unit was found to conserve the EA value, the IP parameter of polymerisation products was found to decrease by 0.6 to 0.7 eV affording an asymmetric narrowing of the frontier energy levels gap. Aided by quantum chemical computations, the effects of structure tailoring of the investigated systems are rationalized, pointing to conscious ways of shaping the electronic properties of thiophene class polymers using synthetically convenient heterodiazole π-conjugated units.

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Section: Introductionmentioning

confidence: 99%

Symmetrically Disubstituted Bithiophene Derivatives of 1,3,4-Oxadiazole, 1,3,4-Thiadiazole, and 1,2,4-Triazole – Spectroscopic, Electrochemical, and Spectroelectrochemical Properties

et al. 2014

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“…Moreover, the red emission at the long-wavelength (low-energy) end of the visible spectrum, however, suggests a potential applicability of these materials in biomedical imaging and signaling, photodynamic therapy, information security and telecommunications. 24 Our study, however, provides a new direction to the design of single luminophore-based stimuliresponsive luminescent materials that exhibit multicolour emission in response to a variety of physical stimuli.…”

Section: Discussionmentioning

confidence: 99%

Novel gold(i) diphosphine-based dimers with aurophilicity triggered multistimuli light-emitting properties

et al. 2016

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aWe report a design strategy for preparation of stimuli-responsive materials with multicolour emission that is based on a single type of luminophore molecule comprising gold(I) and flexible diphosphine ligand. The multistimuli-responsive luminescent dinuclear [Au2(dpephos)2](X)2 (dpephos = bis(2-diphenylphosphino)-phenyl ether; X = NO3, 1; CF3SO3, 2; BF4, 3; PF6, 4; SbF6, 5) complexes were obtained by rapid mechanochemical syntheses. The single crystal X-ray diffraction analysis of complexes 1-5 revealed that the [Au2(dpephos)2] 2+ cations do not exhibit short intramolecular aurophilic interaction. Supported by the structural flexibility of the dpephos ligand, these intramolecular Au···Au contacts are highly sensitive to external stimuli, such as light, temperature, mechanical grinding and exposure to solvent vapours. The ensuing materials, which comprise only gold(I)-diphosphine luminophores, can emit green, yellow and red or red colour, and the colour of the emitted light can be switched by light, heat or pressure. A change from green to yellow in the emission was observed upon heating to room temperature under the excitation with 365 nm, whereas a change from yellow to red was achieved by mechanical grinding. Moreover, the green emission can be switched to red by changing the excitation wavelength to 312 nm. All these reversible luminescence colour changes are readily perceivable by naked eye, and they are attributed to small structural modifications induced by external stimuli that also modulate the intramolecular Au···Au interaction. The red emission from these gold(I) diphosphine-based dimers can be attributed to the presence of intramolecular aurophilic interaction.

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“…When guest molecules are closer than ideal molecules, there is a chance for excited states to relax via nonradiative pathways. Each of these factors influences the efficiency and brightness of OLEDs and light-emitting electrochemical cell applications [20].…”

Section: Aggregation Studiesmentioning

confidence: 99%

“…It has been perceived that most of the aromatic luminophores have experienced the ACQ effect, which has been indicated in the outline of Photophysics of aromatic molecules in 1970 [19]. Furthermore, the ACQ effect might be more demand in the field of OLEDs [20]. The present article deals with the synthesis, characterization and luminescence properties of new low band gap bluish green and greenish yellow emitting conjugated polymers (PTVT and PTVBT).…”

Section: Introductionmentioning

confidence: 99%

Conductive and photoactive nature of conjugated polymer based on thiophene functionalized thiazole or benzothiadiazole

Mahesh¹,

Karpagam²,

Goubard³

2018

Express Polym. Lett.

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Abstract. New poly (thiophene vinyl thiazole) (PTVT) and poly (thiophene vinyl benzothiadiazole) (PTVBT) was synthesized by Wittig condensation route. The absorption maximum of PTVT and PTVBT appeared at 376 and 410 nm in a solution state, and it was red-shifted to 417 and 510 nm in a thin film state. The optical band gaps were 1.7 and 1.5 eV calculated from thin film absorption edges of the polymer. The photoluminescence spectra of PTVT and PTVBT have an emission peak at 457 nm with bluish green and 487 nm with greenish-yellow fluorescence in THF solution. Both polymers showed a short fluorescence decay time (τ 1 ) of 2.31 and 0.73 ns respectively. Furthermore, the aggregation-caused quenching (ACQ) phenomenon observed in both polymers in decreased fluorescence intensity with different water fractions. The lower electrochemical band gaps were achieved for both polymers (1.4, and 1.3 eV) from cyclic voltammetry. Both polymers have a granular shaped morphology with good surface roughness was observed using AFM. High thermal stability was observed with 8% weight loss at 400°C for PTVT and 6% weight loss at 460°C for PTVBT. The highest electrical conductivity was observed from electrochemical impedance measurement which was 7.68·10 -6 Ω -1 ·cm -1 for PTVBT.

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Near-infrared phosphorescence: materials and applications

Cited by 584 publications

References 477 publications

Symmetrically Disubstituted Bithiophene Derivatives of 1,3,4-Oxadiazole, 1,3,4-Thiadiazole, and 1,2,4-Triazole – Spectroscopic, Electrochemical, and Spectroelectrochemical Properties

Symmetrically Disubstituted Bithiophene Derivatives of 1,3,4-Oxadiazole, 1,3,4-Thiadiazole, and 1,2,4-Triazole – Spectroscopic, Electrochemical, and Spectroelectrochemical Properties

Novel gold(i) diphosphine-based dimers with aurophilicity triggered multistimuli light-emitting properties

Conductive and photoactive nature of conjugated polymer based on thiophene functionalized thiazole or benzothiadiazole

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