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Experimental characterization reveals bright blue upconversion photoluminescence in a novel thulium supramolecular compound, indicating potential for optical and photonic applications.
A novel thulium compound [Tm(H2O)8][(5-sulfosalicylic acid anion)3]•H2O (1) was prepared. It features a three-dimensional (3-D) supramolecular framework. The solid-state photoluminescence measurements reveal that it exhibits an upconversion emission in the blue region, which is resulted from the 1G4 → 3H6 characteristic emission of the 4f electron intrashell transitions of the Tm3+ ions. Compound one possesses CIE (Commission Internationale de I’Éclairage) chromaticity coordinates of 0.1279 and 0.0781. The CCT (correlated color temperature) is 6971 K. The solid-state UV/Vis diffuse reflectance spectroscopy discovers an optical band gap of 2.81 eV.
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Xu et al. (2026) studied this question.
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