Control of Emission Color of High Quantum Yield CH 3 NH 3 PbBr 3 Perovskite Quantum Dots by Precipitation Temperature

Emission color controlled, high quantum yield CH3NH3PbBr3 perovskite quantum dots are obtained by changing the temperature of a bad solvent during synthesis. The products for temperatures between 0 and 60 °C have good spectral purity with narrow emission line widths of 28–36 nm, high absolute emission quantum yields of 74% to 93%, and short radiative lifetimes of 13–27 ns. Nanometer-sized II–VI, III–V, and IV–VI semiconductor particles with size- and surface-dependent properties, often termed as colloidal quantum dots (QDs), have been extensively studied for more than 30 years meanwhile,1 with a variety of applications explored such as in photovoltaics, biosensors, light emitting diodes (LEDs), and so on.2…