Design of Highly Luminescent Anionic Manganese(II) Complexes for Application in Organic Light-Emitting Diodes

Abstract

This study reports on the successful preparation of eight novel luminescent manganese(II) complexes, for which melting and degradation onset temperatures, X-ray diffraction patterns, luminescence spectra, emission lifetimes, and quantum yields were measured. Based on the results, [BnMIm]2[MnBr4] (BnMIm = 1-benzyl-3-methylimidazolium ion) was chosen for the preparation of organic light-emitting diodes, due to its remarkable quantum yield (Ф = 0.59) and high crystallinity. Next, to demonstrate applicability of complexes with [BnMIm]+ cation as emitter materials, thin luminescent films were prepared out of them. Finally, optical band gap of [BnMIm]2[MnBr4] was estimated from its absorption spectrum.