Thermo-Sensitive Eu-III Coordination Polymers with Amorphous Networks

Hasegawa, Yasuchika, Sato, Natsumi, Hayashi, Joe, Kitagawa, Yuichi, Fushimi, Koji

doi:10.1002/slct.202100531

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 degrees C and 270 degrees C, respectively. The intrinsic emission quantum yield phi(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 (D-5(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 degrees C) is useful for surface temperature detection in the field of high-speed wind tunnel experiments such as aircraft and automobile designs.

Thermo-Sensitive Eu-III Coordination Polymers with Amorphous Networks

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