Add time:08/28/2019         Source:sciencedirect.com

Methylammonium lead bromide (CH3NH3PbBr3) thin films and nanocrystals are useful for solar cells and LED applications. In order to improve stability in ambient environment, CH3NH3PbBr3 nanocrystals have been synthesized using Oleylamine (cas 112-90-3) as capping molecule. It was found that by increasing the oleylamine to CH3NH3PbBr3 perovskite ratio (OPR), the photoluminescence wavelengths of CH3NH3PbBr3 nanocrystals could be varied from 505 nm (green) to 450 nm (blue). The change in emission wavelength is associated with a morphology change from nanoplatelets of ∼10 nm width at OPR < 1 to nanoparticles of ∼3 nm diameter at OPR > 1. It is suggested that the morphology change of nanocrystals is a result of geometric packing constraint of the sizes of oleylamine and PbBr3 octahedra. The nanocrystals with OPR = 0.75 maintain photoluminescence property for more than 6 months in ambient condition and can sustain temperature of 150 °C for 30 min.

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