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Sensitization of Ln III (Ln = Eu, Tb, Tm) Ion Luminescence by Functionalized Polycarbonate‐Based Materials and White Light Generation
Author(s) -
Tigaa Rodney A.,
Aerken Xuekelaiti,
Fuchs Alan,
de BettencourtDias Ana
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700655
Subject(s) - chemistry , polycarbonate , luminescence , pyridine , polymer , fluorescence , polymerization , glass transition , polymer chemistry , ion , photochemistry , organic chemistry , materials science , physics , optoelectronics , quantum mechanics
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 ( T g ) of the BEP polymer was shifted from –32 °C to –7 and –8 °C after coordination of the Eu III and Tb III ions, respectively. Similarly, the T g of the BDP polymer was shifted from –13 °C to –9 and –10 °C after coordination of Eu III and Tb III ions, respectively. Both polymers sensitized Ln III ‐centered emission; the BEP polymer was the most efficient at sensitizing Ln III ‐centered luminescence with an emission efficiency of 30 and 31 % for the Eu III and Tb III systems, respectively, compared to the 2 % determined for both the Eu III and Tb III BDP systems. Blue emission was observed when Tm III was used, and a system with the composition BEP 1 Eu 1.8 Tb 28 led to a material with CIE coordinates (0.31, 0.33), typical of white light.