Highly efficient self-trapped exciton emission in a one-dimensional face-shared hybrid lead bromide

Abstract

A new one-dimensional (1D) face-shared hybrid lead bromide of (2cepiH)PbBr3, which exhibits intrinsic broadband yellow-light emission with a quantum yield of 16.8% outperforming all previously reported 1D face-shared hybrid metal...

Third Harmonic Upconversion and Self-Trapped Excitonic Emission in 1D Pyridinium Lead Iodide

“…Therefore, the thermal barrier between the FE and STE states is of the order of 4 meV (40–50 K). Similar results have been observed for other 1D face-shared hybrid metal halide systems, and the higher energy emission peaks observed at low temperatures have been attributed to FE emission. − The variable temperature PLE spectra of the STE emission (Figure b) show a clear blue shift in the band edge with decreasing temperature. A significant change is observed in the PLE spectra around 200 K. From 300 to 200 K, the PLE spectra show a slow rise above the band edge along with a broad peak.…”

A One-Dimensional Broadband Emissive Hybrid Lead Iodide with Face-Sharing PbI6 Octahedral Chains

“…Organic–inorganic hybrid metal halides, for instance, three-dimensional (3D) perovskite CH 3 NH 3 PbI 3 , , have progressively developed into one of the most promising materials applied in optoelectronic devices since 2009, , because of their low exciton binding energy, strong light absorption, and long carrier lifetimes and diffusion lengths. , It is well-known that inorganic octahedral frameworks can be tailored from three- (3D) to two- (2D), one- (1D), and zero-dimensional (0D) structures through the structural modifications of organic cations; − the decrease of dimensionality usually leads to a larger exciton binding energy and wider optical bandgap on account of the strong quantum/dielectric confinement. − Also, the structural distortion in the low-dimensional octahedral lattices causes strong phonon scattering, thus limiting charge-carrier mobilities and allowing for incredible broadband self-trapped exciton (STE) emissions . Therefore, low-dimensional hybrid metal halides provide good opportunities for the rapid development of high-performance broadband emitters and deep study of the structure–property relationships.…”

“…It came to our attention that that with the lowering temperature from 300 to 5 K, the peak position at 590 nm almost remains unchanged (Figure a). However, the intensity gradually increases, and the peak gets narrower (Figure b), mainly because of the suppression of the nonradiation recombination of excitons and the diminishing phonon scattering probability, respectively, at low temperatures. This unusual PL evolution according to the temperature can be originating from the thermally activated trapping of STEs .…”

Temperature-Responsive Photoluminescence and Elastic Properties of 1D Lead Halide Perovskites R- and S-(Methylbenzylamine)PbBr3

“…Hydrogen bonding, as one of the widely available interactions connecting the inorganic and organic parts, plays an important role in determining the magnitude of octahedral distortion [ 27 , 28 ]. By changing strengths of hydrogen bonds upon external stimuli (i.e., temperature and pressure), the emissive processes and properties of LD-MHPs, such as peak position, intensity, and the full width at half maximum (FWHM) of self-trapped excitons (STEs), could be manipulated [ 29 , 30 , 31 , 32 ]. Although there have been a handful of reports about the influence of hydrogen bonding on the PL properties of LD-MHPs upon external stimulation, more efforts should be devoted to elucidating the underlying mechanism.…”