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Issue 1, 2017
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Photophysical properties of wavelength-tunable methylammonium lead halide perovskite nanocrystals

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Abstract

We present the time-correlated luminescence of isolated nanocrystals of five methylammonium lead mixed-halide perovskite compositions (CH3NH3PbBr3−xIx) that were synthesized with varying iodide and bromide anion loading. All analyzed nanocrystals had a spherical morphology with diameters in the range of 2 to 32 nm. The luminescence maxima of CH3NH3PbBr3−xIx nanocrystals were tuned to wavelengths ranging between 498 and 740 nm by varying the halide loading. Both CH3NH3PbI3 and CH3NH3PbBr3 nanocrystals exhibited no luminescence intermittency for more than 90% of the 250 s analysis time, as defined by a luminescence intensity three standard deviations above the background. The mixed halide CH3NH3PbBr0.75I0.25, CH3NH3PbBr0.50I0.50, and CH3NH3PbBr0.25I0.75 nanocrystals exhibited luminescence intermittency in 18%, 4% and 26% of the nanocrystals, respectively. Irrespective of luminescence intermittency, luminescence intensities were classified for each nanocrystal as: (a) constant, (b) multimodal, (c) photobrightening, and (d) photobleaching. Based on their photophysics, the CH3NH3PbBr3−xIx nanocrystals can be expected to be useful in a wide-range of applications where low and non-intermittent luminescence is desirable, for example as imaging probes and in films for energy conversion devices.

Graphical abstract: Photophysical properties of wavelength-tunable methylammonium lead halide perovskite nanocrystals

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Supplementary files

Article information


Submitted
06 Sep 2016
Accepted
25 Nov 2016
First published
25 Nov 2016

J. Mater. Chem. C, 2017,5, 118-126
Article type
Paper

Photophysical properties of wavelength-tunable methylammonium lead halide perovskite nanocrystals

D. J. Freppon, L. Men, S. J. Burkhow, J. W. Petrich, J. Vela and E. A. Smith, J. Mater. Chem. C, 2017, 5, 118
DOI: 10.1039/C6TC03886G

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