Green Light-Emitting Solid-State Electrochemical Cell Obtained from a Homoleptic Iridium(III) Complex Containing Ionically Charged Ligands
Source abstract
Abstract
An efficient bluish-green light-emitting Ir(III) complex was prepared by introducing charged side groups onto phenylpyridine ligands. Green light emission with a first maximum at 487 nm (CIE coordinates x = 0.337 and y = 0.501) was observed from a single layer light-emitting electrochemical cell using this new complex; this is the lowest wavelength observed so far for devices based on ionic transition metal complexes.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Molecular Junctions and Nanostructures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Molecular Science, University of Valencia, Poligono La Coma s/n, 46980 Paterna, Valencia, Spain, and Merck OLED Materials GmbH, Industrie Park Hoechst G511, 65926 Frankfurt Am Main, Germany
References (19)
Show source-provided references
1. Burrouches J. H. · Nature · 1990 · 347 · 53910.1038/347539a0 ↗
2. Tang C. W. · Appl. Phys. Lett. · 1987 · 51 · 91310.1063/1.98799 ↗
3. Slinker J. · Chem. Commun. · 2003 · 239210.1039/B304265K ↗
4. Pei Q. · J. Science · 1995 · 270 · 719
5. Handy E. S. · J. Am. Chem. Soc. · 1999 · 121 · 352510.1021/ja984163n ↗
6. Gao F. G. · J. Am. Chem. Soc. · 2000 · 122 · 742610.1021/ja000666t ↗
7. Wegh R. T. · 2004
8. Slinker J. D. · J. Am. Chem. Soc. · 2004 · 126 · 276310.1021/ja0345221 ↗
9. Slinker J. D. · Appl. Phys. Lett. · 2005 · 86 · 17350610.1063/1.1919387 ↗
10. Lowry M. S. · J. Am. Chem. Soc. · 2004 · 126 · 1412910.1021/ja047156+ ↗
11. Becker, H.; Spreitzer, H.; Stössel, P. WO 02068435, 2002.
12. Allen D. W. · J. Chem. Soc., Perkin Trans. 1 · 1986 · 11 · 198910.1039/p19860001989 ↗
13. Hay P. J. · J. Phys. Chem. A · 2002 · 106 · 163410.1021/jp013949w ↗
14. Tamayo A. B. · J. Am. Chem. Soc. · 2003 · 125 · 737710.1021/ja034537z ↗
15. Dedeian K. · Inorg. Chem. · 2005 · 44 · 444510.1021/ic050324u ↗
16. Li · Inorg. Chem. · 2005 · 44 · 171310.1021/ic048599h ↗
17. CIE, 1931.
18. Synthetic procedure: fac-tris[2-(2-pyridinyl-k-N)-5(tri-n-butylphosphonium)phenyl)-k-C]−iridium(III) initially prepared as the bromide salt was synthesized fromfac-tris[2-(2-pyridinyl-k-N)(5-bromphenyl)-kC]−iridium(III), using the method as described in WO 2002/068435, by a modified procedure reported by Allen et al.13N,N-Dimethylformamide was used as the solvent instead of ethanol. The raw product was repeatedly re-crystallized from ethyl acetate to yield 63.2% of the final product, with a purity of 99.5% by1H NMR. The bromide anions were exchanged by hexafluorophosphonium anions using a metathesis reaction.
19. Device preparation: 1was blended with 20% PMMA to enhance the film forming properties. Thin films were prepared from acetonitrile solution via spin coating on patterned ITO coated glass plates. The ITO glass plates were extensively cleaned just before the deposition of the organic film. The thickness of these films ranged between 100 and 200 nm measured using a profilometer. Au was used as the cathode for these devices, which were evaporated under vacuum (<2 × 10-6mbarr) to a thickness of 100 nm. Unless mentioned otherwise the device structure used is ITO/1:PMMA/Au. Devices were characterized in an inert atmosphere.