Reversible photochromic properties of 4,5,6-triaryl-4H-pyran derivatives in a solid state

2021 ◽  
Vol 5 (8) ◽  
pp. 3413-3421
Author(s):  
Yufeng Xie ◽  
Zhiqiang Wang ◽  
Dan Wang ◽  
Yunbing Zhou ◽  
Yunxiang Lei ◽  
...  
Keyword(s):  
Solid State ◽  
Response Time ◽  
Fatigue Resistance ◽  
White Light ◽  
Uv Light ◽  
High Contrast ◽  
Photochromic Properties ◽  
Short Response Time

4,5,6-Triaryl-4H-pyran derivatives were reported to exhibit reversible solid-state photochromic phenomena with high-contrast, short response time, and excellent fatigue resistance upon UV-light and white-light irradiations.

scholarly journals Yellow Emission Obtained by Combination of Broadband Emission and Multi-Peak Emission in Garnet Structure Na2YMg2V3O12: Dy3+ Phosphor

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 542 ◽  
Author(s):  
Weiyi Zhang ◽  
Can He ◽  
Xiaowen Wu ◽  
Ximing Huang ◽  
Fankai Lin ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Emission Band ◽  
Uv Light ◽  
Light Emitting Diode ◽  
Color Temperature ◽  
Broad Emission Band ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Broad Emission

The fabrication and luminescent performance of novel phosphors Na2YMg2V3O12:Dy3+ were investigated by a conventional solid-state reaction method. Under near-UV light, the Na2YMg2V3O12 host self-activated and released a broad emission band (400–700 nm, with a peak at 524 nm) ascribable to charge transfer in the (VO4)3− groups. Meanwhile, the Na2YMg2V3O12:Dy3+ phosphors emitted bright yellow light within both the broad emission band of the (VO4)3- groups and the sharp peaks of the Dy3+ ions at 490, 582, and 663 nm at a quenching concentration of 0.03 mol. The emission of the as-prepared Na2YMg2V3O12:Dy3+ phosphors remained stable at high temperatures. The obtained phosphors, commercial Y2O3:Eu3+ red phosphors, and BaMgAl10O17:Eu2+ blue phosphors were packed into a white light-emitting diode (WLED) device with a near-UV chip. The designed WLED emitted bright white light with good chromaticity coordinates (0.331, 0.361), satisfactory color rendering index (80.2), and proper correlation to a color temperature (7364 K). These results indicate the potential utility of Na2YMg2V3O12:Dy3+ phosphor as a yellow-emitting phosphor in solid-state illumination.

scholarly journals Photo-Switchable Aggregation-Induced Emission of Bisthienylethene-Dipyrimido[2,1-b][1,3]benzothiazole Triad

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5382
Author(s):  
Shan-Shan Gong ◽  
Chun-Hong Zheng ◽  
Zhen-Zhen Chen ◽  
Dong-Zhao Yang ◽  
Mei Chi ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Potential Application ◽  
Optical Memory ◽  
Light Irradiation ◽  
Pmma Film ◽  
High Contrast ◽  
Photochromic Properties ◽  
Non Destructive

A bisthienylethene-dipyrimido[2,1-b][1,3]benzothiazole (BTE-2PBT) triad has been designed and synthesized based on our recent discovery of PBTs as atypical propeller-shaped novel AIEgens. The triad not only maintains the photochromic properties of BTE moiety in solution, film, and solid state but also exhibits remarkable AIE properties. Moreover, the fluorescence of BTE-2PBT PMMA film could be modulated with high contrast by alternate UV and visible light irradiation. Photoerasing, rewriting, and non-destructive readout of fluorescent images on BTE-2PBT PMMA film well demonstrate its potential application as optical memory media.

Research on Photochromic Compounds with Efficient Synthesis and Photochromic Properties of 1-(2-methyl-5-chlorine-3-thienyl)-2-[2-methyl -5-(4-chlorophenyl)-3-thienyl] Perfluorocyclopentene

2014 ◽  
Vol 1003 ◽  
pp. 43-46
Author(s):  
Feng Xia Sun ◽  
Shi Qiang Cui ◽  
Shou Zhi Pu
Keyword(s):  
Solid State ◽  
Phenyl Ring ◽  
Uv Light ◽  
Amorphous Film ◽  
Fluorescence Properties ◽  
Efficient Synthesis ◽  
Photochromic Properties ◽  
Photochromic Compounds ◽  
Fluorescence Switching

A novel unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which two chlorine groups were separately substituted at thiophene and the para-positions of the terminal phenyl ring, were synthesized. Its photochemical , fluorescence properties were investigated systematically both in solution and PMMA amorphous film. The results showed that this compound exhibited reversible photochromism, changing from colorless to purple after irradiation with 313 UV light both in solution and in PMMA amorphous film. Also, it exhibited remarkable fluorescence switching in the solid state.

Synthesis and Optoelectronic Properties of a New Photochromic Diarylethene Bearing a Cyano Group

2011 ◽  
Vol 239-242 ◽  
pp. 2419-2422
Author(s):  
Zhi Peng Tong ◽  
Shou Zhi Pu ◽  
Shi Qiang Cui ◽  
Wei Jun Liu
Keyword(s):  
Solid State ◽  
Uv Light ◽  
Cyano Group ◽  
Optical Recording ◽  
Optoelectronic Properties ◽  
Pmma Film ◽  
Recording Medium ◽  
Photochromic Properties ◽  
Fluorescence Switching

A newunsymmetrical photochromic diarylethene 1-(2-cyanophenyl)-2-[2-methy-5-(3-fluorophenyl)-3-thienyl]perfluorocyclopentene (1a) has been synthesized. Its photochromic properties in solution and PMMA film were investigated. Diarylethene 1a changed the color from colorless to purple upon irradiation with 297 nm UV light, in which absorption maxima were observed at 540 nm in hexane and at 545 nm in PMMA film, respectively. This new photochromic system also exhibited remarkable fluorescence switching in the solid state. The results demonstrated that it can be potentially used as polarization holographic optical recording medium.

Solid-state photochromic behavior of pyrazolone 4-phenylthiosemicarbazones

2017 ◽  
Vol 41 (24) ◽  
pp. 15229-15235 ◽  
Author(s):  
Yuanyuan Che ◽  
Lang Liu ◽  
Yakun Tang ◽  
Yuqian Qiao ◽  
Xianmei Zhao ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Fatigue Resistance ◽  
Photochromic Properties ◽  
Photochromic Behavior

Pyrazolone 4-phenylthiosemicarbazones show excellent solid-state photochromic properties, thermal stability and fatigue resistance upon the UV/Vis irradiation.

The Structure and Photochromism of 2,4,4,6-Tetraphenyl-4H-thiopyran

1992 ◽  
Vol 57 (6) ◽  
pp. 1326-1334 ◽  
Author(s):  
Jaroslav Vojtěchovský ◽  
Jindřich Hašek ◽  
Stanislav Nešpůrek ◽  
Mojmír Adamec
Keyword(s):  
Solid State ◽  
Uv Light ◽  
Order Reaction ◽  
Boat Conformation ◽  
X Rays ◽  
Exponential Time ◽  
First Order ◽  
Double Plane ◽  
The Mean ◽  
Independent Molecules

2,4,4,6-Tetraphenyl-4H-thiopyran, C29H22S, orthorhombic, Pna21, a = 17.980(4), b = 6.956(2), c = 34.562(11) Å, V = 4323(2) Å3, Z = 8, Dx = 1.237 g cm-3, F(000) = 1696, λ(CuKα) = 1.54184 A, μ = 1.372 mm-2, T = 294 K. The final R was 0.050 for the unique set of 3103 observed reflections. The central 4H-thiopyran ring forms a boat conformation for both symmetrically independent molecules with average boat angles 4.4(3) and 6.8(3)° at S and C(sp3), respectively. The mean planes of phenyls at the position 2 and 6 are turned from the double plane of 4H-thiopyran by 42.5(5) and 35.8(3)°, respectively. The investigated material undergoes a photochromic change in the solid state after irradiation with UV light or X-rays. The maximum of the new absorption band is situated at 564 nm. The non-exponential time dependence of photochromic bleaching is analysed in terms of a dispersive first-order reaction.

scholarly journals Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 117
Author(s):  
Zahir Muhammad ◽  
Farman Ali ◽  
Muhammad Sajjad ◽  
Nisar Ali ◽  
Muhammad Bilal ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Solid State ◽  
Room Temperature ◽  
Organic Dyes ◽  
Uv Light ◽  
Heterogeneous Photocatalysis ◽  
Ft Ir ◽  
Complete Mineralization

Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.

scholarly journals Optical studies on Tb3+: Dy3+ singly and doubly doped Borosilicate glasses for white light and solid state lighting applications

2020 ◽  
Vol 534 ◽  
pp. 119943
Author(s):  
Kh.A. Bashar ◽  
W.L. Fong ◽  
Kh.A. Haider ◽  
S.O. Baki ◽  
M.H.M. Zaid ◽  
...  
Keyword(s):  
Solid State ◽  
White Light ◽  
Solid State Lighting ◽  
Borosilicate Glasses ◽  
Optical Studies

Monodispersed hierarchical ZnGa2O4 microflowers for self-powered solar-blind detection

2016 ◽  
Vol 4 (15) ◽  
pp. 3113-3118 ◽  
Author(s):  
Yue Teng ◽  
Le Xin Song ◽  
Wei Liu ◽  
Zhe Yuan Xu ◽  
Qing Shan Wang ◽  
...  
Keyword(s):  
Response Time ◽  
Bias Voltage ◽  
Dark Current ◽  
Blind Detection ◽  
Current Ratio ◽  
Zero Bias ◽  
Single Crystalline ◽  
Short Response Time ◽  
Solar Blind ◽  
Self Powered

We successfully synthesized ZnGa2O4 microflowers self-assembled by hexagonal single-crystalline nanopetals. The ZnGa2O4 crystal exhibits improved solar-blind detection performance such as short response time, large light to dark current ratio and high photocurrent stability under zero bias voltage.

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