Chemistry, like all the natural sciences, Recommanded Product: 41459-42-1, begins with the direct observation of nature¡ª in this case, of matter.41459-42-1, Name is 3-Bromo-2-(bromomethyl)propanoic acid, SMILES is O=C(O)C(CBr)CBr, belongs to bromides-buliding-blocks compound. In a document, author is Park, Jong Hyun, introduce the new discover.
A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
Metal halide perovskites have been investigated for the next-generation light-emitting materials because of their advantages such as high photoluminescence quantum yield (PLQY), excellent color purity, and facile color tunability. Recently, red- and green-emissive perovskite light-emitting diodes (PeLEDs) have shown an external quantum efficiency (EQE) of over 20%, whereas there is still room for improvement for blue emissive PeLEDs. By controlling the halide compositions of chloride (Cl-) and bromide (Br-), the bandgap of perovskites can be easily tuned for blue emission. However, halide segregation easily occurrs in the mixed-halide perovskite under light irradiation and LED operation because of poor phase stability. Here, we explore the effect of A-site cation engineering on the phase stability of the mixed-halide perovskites and find that a judicious selection of low dipole moment A cation (formamidinium or cesium) suppresses the halide segregation. This enables efficient bandgap tuning and electroluminescence stability for sky blue emissive PeLEDs over the current density of 15 mA/cm(2).
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions. you can also check out more blogs about 41459-42-1. Recommanded Product: 41459-42-1.