Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Hybrid lead halide perovskites, described by a formula ABX3, recently emerged as a new class of semiconducting materials for various optoelectronic devices. Especially, colloidal perovskites exhibit numerous favorable properties, such as high photoluminescence quantum yield (PLQY), tunable bandgap, defect tolerance, high charge carrier mobility, large exciton binding energy (EB), outstanding color purity (FWHM < 25 nm) and low cost of production, for high efficiency solution-processed light-emitting diodes (LEDs). Analogously to conventional, inorganic quantum dots (QDs), quantum confinement effects could be observed upon forming colloidal perovskite nanoplatelets (NPLs) with thicknesses below ~10 unit cells (n < 10). Taking MAPbBr3 for example, here we demonstrate a facile synthetic route to obtain monodisperse colloidal solutions of layered perovskites with precise control from n = 1 to n = 7-10 layers. These layer controlled perovskite NPLs not only offers a color-tunable emission, but also enhance the EB. The resultant high EB is crucial to enable efficient radiative recombination of excitons. Most interestingly, our layer controlled NPLs also showed record high solid-state PLQYs (50-90%) for blue and green emission. With the aid of computational methods, we indicate the changes in the crystal lattice depending on the NPL surrounding, which are responsible for such high performance of NPLs in the spin-coated thin films. These quantum confined perovskite NPLs exhibited excellent results in both active layer LEDs and down-converted (DC)-LEDs. The active layer LED shows a maximum luminous efficacy of 7.7 lm/W, which is highest among all colloidal pure-green LEDs. On the other hand, our DC-LED also outperforms the conventional InGaN based green LEDs. This opens an avenue towards low-cost and high-throughput production of solution-processed LEDs.
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