5 years ago

Multicolored Mixed-Organic-Cation Perovskite Quantum Dots (FAxMA1–xPbX3, X = Br and I) for White Light-Emitting Diodes

Multicolored Mixed-Organic-Cation Perovskite Quantum Dots (FAxMA1–xPbX3, X = Br and I) for White Light-Emitting Diodes
Guan Wu, Su Chen, Kangzhe Ma, Hui Dang, Ya-Wen Zhang
Organometal halide perovskites (such as CH3NH3PbX3, X = Cl, Br, I) have received enormous interest due to their strikingly photoelectric properties. Here we develop a facile ligand-assisted reprecipitation method to synthesize NH2CH═NH2PbX3 (NH2CH═NH2+, FA; X = Br and I) perovskite quantum dots (QDs) at room temperature. The FAPbX3 perovskite QDs with uniform monodispersity (sized 4–7 nm) display relatively high photoluminescence quantum yields (PLQYs) of 60–75%. Through manipulating the mixed-organic-cation reactions, we achieve a series of multicolored perovskite QDs with continuously controllable emission wavelengths from 460 to 565 nm. Furthermore, we discuss the influence of ligands (oleic acid and n-octylamine) on PL properties and stabilities of perovskite QDs. Finally, we have successfully designed a white LED via compositing perovskite QDs and poly(methyl methacrylate) (PMMA), which presents a high color rendering index. Considering those remarkable achievements, we believe our work will have great potential to meet various optoelectronic applications.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02309

DOI: 10.1021/acs.iecr.7b02309

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