Improvement of emission intensity in luminescent materials based on the antenna effect

Incorporation of the Eu(tta)3(H2O)2 complex into a co-condensed d-U(600)/d-U(900) matrix

“…Lanthanide ions can form complexes with various organic molecules, such as b-diketonates [1][2][3], aromatic carboxylic acids [4][5][6] and heterocyclic ligands [7][8][9]. Compared to lanthanide ions, lanthanide complexes exhibit a much more efficient emission under ultraviolet (UV) excitation, since the metal ions are protected from vibrational coupling and the light absorption cross section is increased as a result of the so-called ''antenna effect'' [10].…”

Complexation, luminescence and energy transfer of Ln(III) ions with phenylphosphonic acid

“…Stock solutions Nd(III), Eu(III) and Tb(III) ions (0.01 mol l -1 ) were prepared using Nd(ClO 4 ) 3 , Eu(ClO 4 ) 3 and Tb(ClO 4 ) 3 , obtained by dissolving Nd 2 O 3 , Eu 2 O 3 and Tb 4 O 7 (spectroscopically pure, prepared in Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Poznan) in perchloric acid. Samples of Ln(ClO 4 ) 3 were evaporated to dryness and dissolved in methanol.…”

“…In order to enhance the emission intensity, some synergetic agents are introduced, e.g. 1,10-phenanthroline (1,10-phen), 2,2 -bipyridine (bpy), trioctyl phosphine oxide (TOPO) [3][4][5][6]. The enhancement of the emission intensity can also be achieved as a result of the effect of co-fluorescence [7].…”

Luminescent materials consisting of Eu(III) ions complexed with cryptand ligand and coligands entrapped in xerogel matrices

“…in the xerogel matrix. To realize the short-range approach we tested some ligands for Eu(III) ion [13]. Among the ligands studied the best results, meaning the higher emission intensity and longer time, show [biqO 2 .bpy.bpy] cryptand, where biqO 2 is 3,3 0 -biisoquinoline-2,2 0 -dioxide and bpy is 2,2 0 -bipyridine ( Fig.…”

“…1). Luminescence intensity can be improved if the coordination sphere is completed additionally with coligands and simultaneously light collectors such as 1,10-phenanthroline (phen) or triphenylphosphine oxide (TPPO) [13,14].…”