European Journal of Inorganic Chemistry
European Journal of Inorganic Chemistry
3 years ago

Sensitization of LnIII (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate-Based Materials and White Light Generation

Sensitization of LnIII (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate-Based Materials and White Light Generation
Ana de Bettencourt-Dias, Alan Fuchs, Rodney A. Tigaa, Xuekelaiti Aerken
We prepared pyridine-2,6-bis(ethyl)ester [BEP] and pyridine-2,6-bis(diethylamide) [BDP] polymers with polycarbonate backbones by ring-opening polymerization of the pyridine-bis(ethyl)ester and pyridine-bis(diethylamide) units appended to a cyclic carbonate via a glycol chain. The polymers were characterized by FTIR, NMR, UV/Vis absorption and fluorescence spectroscopy, as well as SEC, powder XRD, DSC, and TGA. The measured glass transition temperature (Tg) of the BEP polymer was shifted from –32 °C to –7 and –8 °C after coordination of the EuIII and TbIII ions, respectively. Similarly, the Tg of the BDP polymer was shifted from –13 °C to –9 and –10 °C after coordination of EuIII and TbIII ions, respectively. Both polymers sensitized LnIII-centered emission; the BEP polymer was the most efficient at sensitizing LnIII-centered luminescence with an emission efficiency of 30 and 31 % for the EuIII and TbIII systems, respectively, compared to the 2 % determined for both the EuIII and TbIII BDP systems. Blue emission was observed when TmIII was used, and a system with the composition BEP1Eu1.8Tb28 led to a material with CIE coordinates (0.31, 0.33), typical of white light.Functionalized polycarbonates sensitize red, green, and blue emission from EuIII, TbIII, and TmIII, respectively.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700655

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