(Tartu Ülikool, 2023) Sääsk, Verner; Põhako-Esko, Kaija; Chou, Hou-Hsiu; Tartu Ülikool. Loodus- ja täppisteaduste valdkond; Tartu Ülikool. Keemia instituut
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.