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. 2015 Jul 14;2(9):1500194.
doi: 10.1002/advs.201500194. eCollection 2015 Sep.

Control of Emission Color of High Quantum Yield CH3NH3PbBr3 Perovskite Quantum Dots by Precipitation Temperature

He Huang  1 , Andrei S Susha  1 , Stephen V Kershaw  1 , Tak Fu Hung  2 , Andrey L Rogach  1
Affiliations

Control of Emission Color of High Quantum Yield CH3NH3PbBr3 Perovskite Quantum Dots by Precipitation Temperature

He Huang et al. Adv Sci (Weinh). .

Abstract

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.

Keywords: CH3NH3PbBr3; perovskite; photoluminescence; precipitation; quantum dots.

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Figures

Figure 1
Figure 1
CH3NH3PbBr3 PQDs exhibit a size‐tunable bandgap with narrow and bright emission: a) photograph of colloidal solutions in toluene under UV lamp excitation (λ = 365 nm); b) PL spectra tunability over the range of wavelengths indicated; c) optical absorption spectra with the respective PL spectra for the three samples synthesized at different precipitation temperatures as indicated.
Figure 2
Figure 2
XRD patterns of CH3NH3PbBr3 PQDs (freeze dried sample) and the discarded precipitate from the same batch. Reference lines for specified reflections derived from literature values40 are shown.
Figure 3
Figure 3
TEM image of a) representative CH3NH3PbBr3 QDs (60 °C); b) the corresponding HRTEM image; c) a single selected particle at high magnification; and d) the FFT pattern for the same image region.
Figure 4
Figure 4
Time‐resolved PL decays and fitted curves for PQD samples grown at 0 to 60 °C, along with the trends in radiative recombination lifetime (τ r) and nonradiative recombination lifetime (τ nr) presented in inset.
See this image and copyright information in PMC

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