Photophysical properties of wavelength-tunable methylammonium lead halide perovskite nanocrystals [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:: pages 118-126 : digital, PDF file
Additional Creators:: Ames Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

Here 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. Finally, 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.

Report Numbers:

E 1.99:is-j--9149
is-j--9149

Subject(s):

Note:

Published through SciTech Connect.
11/25/2016.
"is-j--9149"
Journal of Materials Chemistry. C 5 1 ISSN 2050-7526; JMCCCX AM
Freppon, Daniel J. [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry]; Men, Long [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry]; Burkhow, Sadie J. [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry]; Petrich, Jacob W. [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry]; Vela, Javier [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry]; Smith, Emily A. [Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Chemistry].

Funding Information:

AC02-07CH11358

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