Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 122, Issue 3, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-016-9726-2
Keywords
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Funding
- German Federal Ministry of Education and Research
- BMBF
- European Union in LEO project [H2020-ICT-2014-1]
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Using printed organic light-emitting diodes (OLEDs) for lighting, smart-packaging and other mass-market applications has remained a dream since the first working OLED devices were demonstrated in the late 1980s. The realization of this long-term goal is hindered by the very low abundance of iridium and problems when using low-cost wet chemical production processes. Abundant, solution-processable Cu(I) complexes promise to lower the cost of OLEDs. A new copper iodide NHetPHOS emitter was prepared and characterized in solid state with photoluminescence spectroscopy and UV photoelectron spectroscopy under ambient conditions. The photoluminescence quantum efficiency was determined as 92 +/- 5 % in a thin film with yellowish-green emission centered around 550 nm. This puts the material on par with the most efficient copper complexes known so far. The new compound showed superior solubility in non-polar solvents, which allowed for the fabrication of an inkjet-printed OLED device from a decalin-based ink formulation. The emission layer could be processed under ambient conditions and was annealed under air. In a very simple stack architecture, efficiency values up to 45 cd A(-1) corresponding to 13.9 +/- 1.9 % EQE were achieved. These promising results open the door to printed, large-scale OLED devices with abundant copper emitters.
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