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

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Ngôn ngữ: eng

Ký hiệu phân loại: 541.382 Radiation chemistry

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016

Mô tả vật lý: Size: p. 118-126 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 255755

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Here we present the time-correlated luminescence of isolated nanocrystals of five methylammonium lead mixed-halide perovskite compositions (CH
3
NH
3
PbBr
3$-$x
I
x
) 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 CH
3
NH
3
PbBr
3$-$x
I
x
nanocrystals were tuned to wavelengths ranging between 498 and 740 nm by varying the halide loading. Both CH
3
NH
3
PbI
3
and CH
3
NH
3
PbBr
3
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 CH
3
NH
3
PbBr
0.75
I
0.25
, CH
3
NH
3
PbBr
0.50
I
0.50
, and CH
3
NH
3
PbBr
0.25
I
0.75
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 CH
3
NH
3
PbBr
3$-$x
I
x
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.

1. 30 direct energy conversion
2. 36 materials science

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