Open Access

Tassilo Naujoks

• Towards bendable, foldable, stretchable and transparent screens with bright vibrant colours, a variety of solutions have been researched on, with all having their respective advantages and drawbacks. While classical semiconductor based LED are most suited for point light sources, their relatively high cost render them less favourable for large area application. The organic LED (OLED) excels at this point with less energy-intense refinement and thus manufacturing cost for industrial production. These costs are particularly low, when the device can be fabricated from solution. For example ink-jet printed LED panels have the potential to drop in price comparable to any other printed medium. Inorganic semiconductors generally lack the flexibility and solubility to be handled in solution or on flexible substrates. Then again, soft crystals such as lead halide perovskites (LHPs) show decent solubility, which can be used for solution-processed optoelectronic devices. The LHPs have alreadyTowards bendable, foldable, stretchable and transparent screens with bright vibrant colours, a variety of solutions have been researched on, with all having their respective advantages and drawbacks. While classical semiconductor based LED are most suited for point light sources, their relatively high cost render them less favourable for large area application. The organic LED (OLED) excels at this point with less energy-intense refinement and thus manufacturing cost for industrial production. These costs are particularly low, when the device can be fabricated from solution. For example ink-jet printed LED panels have the potential to drop in price comparable to any other printed medium. Inorganic semiconductors generally lack the flexibility and solubility to be handled in solution or on flexible substrates. Then again, soft crystals such as lead halide perovskites (LHPs) show decent solubility, which can be used for solution-processed optoelectronic devices. The LHPs have already proven their potential by revolutionising the research on photovoltaic devices leading to a potential dethroning of silicon in levelised cost of electricity (LCOE). With that, a significant fraction of the silicon dominant market share in photovoltaic modules may be replaced by the perovskite technology in the near future. Also, the LHPs can be prepared in the form of nanocrystals (NCs) for achieving extraordinarily efficient light-emission.…