Poly(ether ether ketone) (PEEK) was used to prepare a sulfonated terbium salt (Tb-SPEEK). This salt emits green fluorescent light under u.v. excitation. The fluorescence originates from the transition of the 5D 4 level of Tb 3 ? to the levels of 7Fj (J= 6, 5, 4, 3). The fluorescence intensity increases with increasing Tb content, reaching a maximum value at around 9 wt% Tb, and then decreases due to the formation of ionic aggregates in the salt. The excitation of the salt is related to its Tb content and corresponding solid state, and changes after experiencing thermal treatment
Посилання на статтю:
Fluorescence properties of the terbium salt of sulfonated poly(ether ether ketone) / Hanmin Zeng, Zhiyi Zhang and Shulin Wu // Polymer. – 1994. – Vol 35. – P. 1092-1094.