Journal of Semiconductors, Volume. 46, Issue 7, 072102(2025)
Broadband photoluminescence and nonlinear chiroptical properties in chiral 2D halide perovskites
Fig. 1. (Color online) The crystal structure and characterization of single crystals of R/S-3BrMBA2PbBr4. (a) Chemical structures of chiral organic enantiomers (R/S)-3BrMBA. (b) Schematic illustrations of crystal structures of R/S-3BrMBA2PbBr4. (c) Powder XRD patterns of chiral R/S-3BrMBA2PbBr4 single crystals. (d) The optical image under (left) ambient light and (right) UV light (365 nm) of R-3BrMBA2PbBr4 single crystals.
Fig. 2. (Color online) Optical properties of R/S-3BrMBA2PbBr4. (a) and (b) UV−Vis absorbance and circular dichroism spectra of the CHPs thin films. (c) PL spectra of R-3BrMBA2PbBr4 single crystal (λexc = 325 nm). (d) CIE coordinated of the emissions of R/S-3BrMBA2PbBr4 single crystals.
Fig. 3. (Color online) The photoluminescence properties of R/S-3BrMBA2PbBr4. (a) Power-dependent PL spectra of R-CHP single crystals obtained at various excitation powers of a 385 nm laser at room temperature. (b) The integrated PL intensity as a function of excitation power of R-CHP single crystals for FE (top), STE1 (middle), and STE2 (bottom). The experimental results are fitted with a power law (dashed lines), i.e., I ~ Pk, where I and P are the integrated PL intensity and excitation power, respectively. (c) The decays curves of time-resolve photoluminescence spectra of the R-CHP single crystal emission at 405, 525, and 620 nm, fitted by using bi-exponential decay function. (d) Diagram of luminescence processes in the CHP (GS: ground state, FE state: free-exciton state, STE state: self-trapped exciton state).
Fig. 4. (Color online) Nonlinear optical responses of S-3BrMBA2PbBr4 single crystal. (a) The SHG intensity of the CHP crystals pumped at various wavelengths. (b) and (c) The SHG spectra of S-3BrMBA2PbBr4 under various excitation power. The excitation wavelengths is 880 nm. (d) The polarization dependence spectra with different excitation wavelength, the solid curves represent the cos(2θ) fit for SHG. (e) SHG intensity as a function of the rotation angle of the quarter-waveplate. The excitation and detection wavelengths are 840 and 420 nm, respectively. (f) Polar SHG intensity plots of the S-3BrMBA2PbBr4 crystal as a function of polarization angle.
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Dezhong Hu, Zhen Zhang, Kaixuan Zhang, Qian He, Weijie Zhao. Broadband photoluminescence and nonlinear chiroptical properties in chiral 2D halide perovskites[J]. Journal of Semiconductors, 2025, 46(7): 072102
Category: Research Articles
Received: Nov. 27, 2024
Accepted: --
Published Online: Aug. 27, 2025
The Author Email: Weijie Zhao (WJZhao)