Photochromic and photocontrolled luminescent rare-earth D-A hybrid crystals based on rigid viologen acceptors

CrystEngComm ◽  
2021 ◽  
Author(s):  
Yi-Wen Wang ◽  
Meng-Hua Li ◽  
Shuquan Zhang ◽  
Xin Fang ◽  
Mei-Jin Lin
Keyword(s):  
Rare Earth ◽  
Hybrid Crystals ◽  
Donor Acceptor ◽  
Photochromic Materials ◽  
Inorganic Components ◽  
Hybrid Complexes

As an emerging class of hybrid complexes, the donor-acceptor (D-A) hybrid crystals containing photoactive organic and inorganic components have gradually become an ideal platform for constructing photochromic materials in recent...

Aldehyde-Substituted Donor–Acceptor-Type Dithienylethenes as Novel Building Blocks for Photochromic Materials

2018 ◽  
Vol 42 (10) ◽  
pp. 531-534 ◽  
Author(s):  
Yangyang Wang ◽  
Mengna Li ◽  
Yufei Song ◽  
Ming Qin ◽  
Xuehui Li ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Near Infrared ◽  
Building Blocks ◽  
Formyl Group ◽  
Photochromic Properties ◽  
H Nmr ◽  
Donor Acceptor ◽  
Group Functions ◽  
Photochromic Materials ◽  
C Nmr

Two novel donor–π–acceptor-type dithienylethene derivatives, in which the triphenylamine group acts as electron donor and the formyl group functions as electron acceptor, have been developed. Their structures were confirmed by 1H NMR, 13C NMR and HRMS (ESI). Investigation of their photochromic properties indicated that they had good photochromic behaviour and excellent fatigue resistance on irradiation with UV or visible light. DFT calculations further validated these experimental results for photochromic behaviour. Moreover, these compounds can be utilised as versatile building blocks to construct novel near-infrared photochromic materials.

Excitation of the 4F-4F Emission of Donor-Type Rare-Earth Centers Through Donor-Acceptor Pair States (ZNS:TM)

1993 ◽  
Vol 301 ◽  
Author(s):  
K. LÖbe ◽  
R. Boyn ◽  
H. Zimmermann
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Acceptor Pair ◽  
Pumping Rate ◽  
Electron Beam Excitation ◽  
Donor Type ◽  
Donor Acceptor ◽  
Donor Acceptor Pair ◽  
Partial Blocking ◽  
Site Selective

ABSTRACTEnergy transfer from donor-acceptor pair states is known to be an efficient excitation channel for 4f-4f emission, especially if the rare-earth centers themselves are the relevant donors. Information on this type of mechanism can be obtained in the case when it is possible to observe, parallel to the 4f-4f emission, luminescence arising from radiative deexcitation of the pairs.We have found these two kinds of emission, under electron-beam excitation, in ZnS:Tm crystals which, according to earlier site-selective studies performed by us, contain predominantly donor-type rare-earth centers. Characteristic differences between the two kinds of emission are found in the dependence of intensities on pumping rate; these arise from partial blocking of the energy transfer due to depopulation of the 4f ground levels. By quantitative studies of the correlation between those intensities we demonstrate that the same types of initial states are involved in the energy transfer and the pair transitions.

Novel rare earth fluorescent supramolecular polymeric assemblies constructed by orthogonal pillar[5]arene-based molecular recognition, Eu(iii)-coordination and π–π donor–acceptor interactions

2017 ◽  
Vol 53 (5) ◽  
pp. 889-892 ◽  
Author(s):  
Liqing Shangguan ◽  
Hao Xing ◽  
Julfikar Hassan Mondal ◽  
Bingbing Shi
Keyword(s):  
Rare Earth ◽  
Molecular Recognition ◽  
Molecular Interaction ◽  
Supramolecular Polymer ◽  
Donor Acceptor ◽  
Polymeric Assemblies

Linear rare earth fluorescent supramolecular polymer is easily constructed by pillar[5]arene-based molecular interaction.

Study on Synthesis and Fluorescent Properties of Ternary and Quaternary Rare Earth Europium Complexes

2011 ◽  
Vol 380 ◽  
pp. 103-106
Author(s):  
Xao Xiu Hao ◽  
Jie Meng ◽  
Cheng Sun
Keyword(s):  
Rare Earth ◽  
Fluorescence Intensity ◽  
Fluorescence Emission ◽  
Relative Fluorescence Intensity ◽  
Fluorescent Properties ◽  
Europium Complexes ◽  
Europium Ion ◽  
Photochromic Materials ◽  
Printing Ink ◽  
Low Symmetry

Synthesis and fluorescent properties of rare earth Rare earth complexes ultraviolet photochromic materials such as ternary and quaternary europium complexes were synthesized in this,we selected the high luminescent β-diketones such as α-thenoyltrifluoroacetone(HTTA),fine fragrant carboxylic acid and o-phenanthroline as ligands. The structure of the ternary and quaternary europium complexes were studied by IR spectrum, indicated that these complexes have bonded with the ligands. The fluorescent properties were studied systematically by fluorescence spectrophotometer, relative fluorescence intensity of the ternary and quaternary europium complexes were quantitative determinated ,these europium complexes showed invisible in the visible light and showed obvious red fluorescence under ultraviolet light. This study of the rare earth europium photochromic materials have theoretical and practical application guidance to security printing ink and packing. Experiment shows, The fluorescence properties of Eu(BA)3Phen and Eu(BA)(TTA)2Phen indicated that two excitation spectrum are banded spectrum, the energy which the ligands have absorbed transmitted effectively to europium ion. The fluorescence emission bands of Eu(BA)3Phen and Eu(BA)(TTA)2Phen are similar, but the relative fluorescence intensity of 5D0→7F2 of Eu(BA)(TTA)2Phen is far bigger than Eu(BA)3Phen. The two complexes have the low symmetry, have the good monochromaticity.

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