Journal
ORGANIC ELECTRONICS
Volume 15, Issue 8, Pages 1810-1814Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2014.05.012
Keywords
UPS; UV-Vis absorption; Energy level diagram; Tetrakis erbium quinolinate complex; Optical gap; Ionization energy
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The electronic structures of three new synthesised tetrakis Erbium(III) quinolinate complexes (Na[ErQ(4)], Na[Er(Q57Br)(4)] and Na[Er(Q57I)(4)]) have been studied by means of photoemission and absorption spectroscopies and compared with corresponding experimental data of Tris(8-hydroxyquinolinate) Erbium(III) (ErQ(3)). Core level and valence band spectra of Na[ErQ(4)] are very similar to ErQ(3) ones apart from a slight modification in the O 1s core level. The fundamental physical parameters for optical device applications as ionization energy and optical gap are the same, corresponding to 5.2 eV and 2.9 eV respectively. For the other two molecules, the introduction of halogens (Br, I) in the ligands leads to a reduction of 0.2 eV for the optical gap and to an increase of 0.5 eV for the ionization energy with respect to ErQ(3). (C) 2014 Elsevier B. V. All rights reserved.
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