2, Universitat de Valencia, Valencia, , Spain
3, Delft University of Technology, Delft, , Netherlands
Although currently their main application is as highly efficient light absorber materials for solar cell applications, halide perovskites have recently also attracted attention due to their prospective potential as emitters in electroluminescent devices. Among their particularly beneficial properties are their balanced charge carrier mobilities as well as the tuneability and high color purity of their emission spectra. From an industrial point of view, they have a number of additional features which are particularly interesting: the synthetic procedures are quite straightforward, the starting materials are available at low cost and they can be deposited from solution by large-area and roll-to-roll compatible coating methods rather than by vacuum based technologies. This contribution presents the development of LED stack architectures which have the potential to be processed completely from solution with 3D-perovskite as the emitter layer . Peak luminances of more than 13000 cd/m2 have been demonstrated with efficiencies of up to 14 cd/A. Photophysical studies indicate that ionic redistribution induced by the electrical field during operation might have a significant influence on device performance and stability. In order to pave the way towards industrial-style mass production, also the results from initial roll-to-roll slot die coating experiments using halide perovskite based inks will be presented.