A One-Dimensional Organic Lead Chloride Hybrid with Excitation-Dependent Broadband Emissions
Organic-inorganic metal halide hybrids have emerged as a new class of materials with fascinating optical and electronic properties. The exceptional structure tunability has enabled the development of materials with various dimensionalities at the molecular level, from three-dimensional (3D) to 2D, 1D, and 0D. Here, we report a new 1D lead chloride hybrid, C4N2H14PbCl4, which exhibits unusual inverse excitation-dependent broadband emission from bluish-green to yellow. Density functional theory calculations were performed to better understand the mechanism of this excitation-dependent broadband emission. This 1D hybrid material is found to have two emission centers, corresponding to the self-trapped excitons (STEs) and vacancy-bound excitons. The excitation-dependent emission is due to different populations of these two types of excitons generated at different excitation wavelengths. This work shows the rich chemistry and physics of organic-inorganic metal halide hybrids and paves the way to achieving novel light emitters with excitation-dependent broadband emissions at room temperature.
Wu, Guanhong, Chenkun Zhou, Wenmei Ming, Dan Han, Shiyou Chen, Dong Yang, Tiglet Besara et al. "A one-dimensional organic lead chloride hybrid with excitation-dependent broadband emissions." ACS Energy Letters 3, no. 6 (2018): 1443-1449.
ACS Energy Letters