Turn-on-type emission enhancement and ratiometric emission color change based on the combination effect of aggregation and TICT found in the hexaazatriphenylene-triphenylamine dye in an aqueous environment

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 86301-86308 ◽  
Author(s):  
Tsutomu Ishi-i ◽  
Yuriko Moriyama ◽  
Yutarou Kusakaki
Keyword(s):  
Color Change ◽  
Aqueous Environment ◽  
Combination Effect ◽  
Turn On ◽  
Emission Enhancement ◽  
Emission Color ◽  
Donor Acceptor

Turn-on-type emission enhancement and a ratiometric emission color change were achieved simultaneously due to the aggregation and TICT of a donor–acceptor-type dye.

Photochromism and emission-color change in Ba3MgSi2O8-based phosphors

2016 ◽  
Vol 173 ◽  
pp. 237-242 ◽  
Author(s):  
Yoshinori Yonezaki ◽  
Shino Takei
Keyword(s):  
Color Change ◽  
Emission Color

A Chromone Based Fluorescent Probe for the Effective Detection of Aluminium Ion

2020 ◽  
Vol 20 (5) ◽  
pp. 2840-2846
Author(s):  
Hyorim Kim ◽  
Ramalingam Manivannan ◽  
Young-A Son
Keyword(s):  
Metal Ion ◽  
Color Change ◽  
Test Strip ◽  
Phenyl Hydrazine ◽  
Mass Spectral ◽  
H Nmr ◽  
Turn On ◽  
Molecular Charge ◽  
Intra Molecular Charge Transfer ◽  
Significant Interference

A new chromone moiety fused with phenyl hydrazine carboxamide as a binding site for metal ion was designed and synthesized as a colorimetric/fluorimetric probe for selective sensing of Al3+ ion. The absorption and fluorescence spectral results showed selective and sensitive recognition of Al3+ with no significant interference from other competitive metal ions. The addition of Al3+ to R brought a prompt color change from colorless to yellow and the turn-on fluorescence response with Al3+ among different cations was studied. The visible color change and turn-on fluorescence Al3+ ion with R was attributed to the intra molecular charge transfer transition. The plausible binding nature of the receptor with Al3+ has also been anticipated by the results of 1H NMR and mass spectral analysis. For the practical effectiveness, test strip prepared using probe R was successfully applied to monitor the presence of Al3+ ion in aqueous medium.

An efficient top-emitting electroluminescent device on metal-laminated plastic substrate

2004 ◽  
Vol 846 ◽  
Author(s):  
L. W. Tan ◽  
X. T. Hao ◽  
K. S. Ong ◽  
Y. Q. Li ◽  
F. R. Zhu
Keyword(s):  
Polymer Layer ◽  
Plastic Substrate ◽  
Operating Voltage ◽  
Light Emitting ◽  
Turn On ◽  
Organic Light ◽  
Emission Color ◽  
Conventional Structure ◽  
Polyethylene Terephthalate Substrate ◽  
Luminance Efficiency

ABSTRACTAn efficient flexible top-emitting organic light-emitting device (OLED) was fabricated on an aluminum-laminated polyethylene terephthalate substrate. A spin-coated light-emitting polymer layer was sandwiched between a silver anode and a multi-layered semitransparent cathode. The performance of polymer OLEDs was analyzed and compared with that of the devices having a conventional structure. An optical microcavity formed in the device enables to tune the emission color by varying the thickness of the active polymer layer. The OLEDs having a 110-nm-thick active polymer layer exhibited superior electroluminescence performance, with a turn-on voltage of 2.5V and a luminance efficiency of 4.56 cd/A at an operating voltage of 10V.

scholarly journals Molecular insertion regulates the donor-acceptor interactions in cocrystals for the design of piezochromic luminescent materials

2021 ◽  
Author(s):  
Chunguang Zhai ◽  
Xiu Yin ◽  
Shifeng Niu ◽  
Mingguang Yao ◽  
Shuhe Hu ◽  
...  
Keyword(s):  
Intermolecular Interactions ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Luminescent Materials ◽  
Conformation Change ◽  
Emission Enhancement ◽  
Donor Acceptor ◽  
Fine Manipulation

Abstract Developing a universal strategy to design new piezochromic luminescent materials with desirable properties remains challenging. Here, we report that insertion of a non-emissive molecule into a donor (perylene) and acceptor (TCNB) binary cocrystal can realize fine manipulation of intermolecular interactions between perylene and TCNB for desirable piezochromic luminescent properties. A continuous pressure-induced emission enhancement up to 3 GPa and a blue shift from 655 nm to 619 nm have been observed in perylene-TCNB cocrystals upon THF insertion, in contrast to the red-shifted and quenched emission observed when compressing perylene-TCNB cocrystals and other cocrystals reported earlier. By combining experiment with theory, it is further revealed that the inserted non-emissive THF forms blue-shifted H-bonds with neighboring TCNB molecules and promote a conformation change of perylene molecules upon compression, causing the blue-shifted and enhanced emission. This strategy remains valid when inserting other molecules as non-emissive component into perylene-TCNB cocrystals for abnormal piezochromic luminescent behaviors. Our strategy could also be extended to other cocrystals with different donor-acceptor components, opening a new way for designing novel piezochromic luminescent materials for future applications.

Photoresponsive triazole-based donor–acceptor molecules: color change and heat/air-stable diradicals

2019 ◽  
Vol 7 (10) ◽  
pp. 3100-3104 ◽  
Author(s):  
Ning-Ning Zhang ◽  
Rong-Jian Sa ◽  
Shan-Shan Sun ◽  
Ming-De Li ◽  
Ming-Sheng Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Charge Separation ◽  
Color Change ◽  
Heat Stable ◽  
Donor Acceptor ◽  
Acceptor Molecules

An unprecedented series of triazole-based donor–acceptor molecules were found to form highly air/heat-stable triplet diradicals in the solid state accompanied by a color change after photoinduced intramolecular charge separation.

scholarly journals A Turn-On Fluorescent Probe for Sensitive Detection of Cysteine in a Fully Aqueous Environment and in Living Cells

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaohua Ma ◽  
Guoguang Wu ◽  
Yuehua Zhao ◽  
Zibo Yuan ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescent Probe ◽  
High Selectivity ◽  
Coumarin Derivative ◽  
Living Cells ◽  
Sensitive Detection ◽  
Aqueous Environment ◽  
Test Probe ◽  
Aqueous Buffer ◽  
Turn On

We reported here a turn-on fluorescent probe (1) for the detection of cysteine (Cys) by incorporating the recognition unit of 2,4-dinitrobenzenesulfonyl ester (DNBS) to a coumarin derivative. The structure of the obtained probe was confirmed by NMR and HRMS techniques. The probe shows a remarkable fluorescence off-on response (∼52-fold) by the reaction with Cys in 100% aqueous buffer. The sensing mechanism was verified by the HPLC test. Probe 1 also displays high selectivity towards Cys. The detection limit was calculated to be 23 nM. Moreover, cellular experiments demonstrated that the probe is highly biocompatible and can be used for monitoring intracellular Cys.

scholarly journals The Effect of Acceptor Structure on Emission Color Tuning in Organic Semiconductors with D–π–A–π–D Structures

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1179 ◽  
Author(s):  
Przemyslaw Ledwon ◽  
Gabriela Wiosna-Salyga ◽  
Marian Chapran ◽  
Radoslaw Motyka
Keyword(s):  
Organic Semiconductors ◽  
Fluorescence Spectra ◽  
Near Infrared ◽  
Energy Levels ◽  
Light Emitting ◽  
Emission Color ◽  
Donor Acceptor ◽  
Homo And Lumo ◽  
Emission Quenching ◽  
Homo And Lumo Energy

A series of novel donor–acceptor D–π–A–π–D compounds were synthesized and characterized in order to determine the influence of different acceptor units on their properties. The introduction of acceptor moieties had a direct impact on the HOMO and LUMO energy levels. Fluorescence spectra of compounds can be changed by the choice of an appropriate acceptor and were shifted from the green to the near-infrared part of spectra. Due to observed concentration induced emission quenching, the green exciplex type host was used to evaluate the potential of synthesized molecules as emitters in organic light emitting diodes (OLEDs).

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