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Thermo‐Sensitive Eu III Coordination Polymers with Amorphous Networks
Author(s) -
Hasegawa Yasuchika,
Sato Natsumi,
Hayashi Joe,
Kitagawa Yuichi,
Fushimi Koji
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202100531
Subject(s) - chemistry , luminophore , amorphous solid , lanthanide , quantum yield , ligand (biochemistry) , energy transfer , ion , luminescence , glass transition , yield (engineering) , polymer , fluorescence , crystallography , materials science , metallurgy , optoelectronics , organic chemistry , chemical physics , physics , biochemistry , receptor , quantum mechanics
Luminescent Eu III coordination polymer with amorphous transformation and thermo‐sensing abilities under higher temperature, [Eu(hfa) 3 (tppa) n ] m (hfa: hexafluoroacetylacetonate, tppa: tri‐diphenylphosphoryl‐4,4,4‐triphenylamine) is reported. The glass transition and decomposition temperatures are found to be 142 °C and 270 °C, respectively. The intrinsic emission quantum yield Φ 4f − 4f of [Eu(hfa) 3 (tppa) n ] m was estimated to be 69 % in solid state. [Eu(hfa) 3 (tppa) n ] m shows effective decrease in the emission lifetime upon increasing the temperature from 320 to 400 K. The temperature‐depended emission lifetime is caused by the back energy transfer from emitting level of Eu III ion ( 5 D 0 ) to the LLCT band (tppa ligand to hfa ligand) in [Eu(hfa) 3 (tppa) n ] m . Thermo‐sensitive lanthanide luminophore with stable glass formation in higher temperature (>100 °C) is useful for surface temperature detection in the field of high‐speed wind tunnel experiments such as aircraft and automobile designs.