Structure and efficient luminescence upconversion of Ln(iii) aromatic N-oxide coordination polymers

Abstract

A series of lanthanide-based coordination polymers {[Yb_1−xEr_x(4,4′-bpdo)₃(H₂O)₂](CF₃SO₃)₃}_∞ were synthesised where 4,4′-bpdo = 4,4′-bipyridine-N,N′-dioxide with x = 0, 0.05, 0.2, 0.5 or 1. Upconversion measurements reveal visible emission in the red, green, and blue regions corresponding to emission from the Er(iii) cation upon two and three-photon excitation.