Crystal structure and optical properties of in situ synthesized organic-inorganic hybrid metal halides

In recent years, low-dimensional organic-inorganic metal halides have been widely used in photoluminescent diodes, solar cells, lasers, photodetectors, and other fields because of their rich structures and excellent optoelectronic properties. In this paper, organic cations H2DAB (DAB = benzidine) and H2TMB (TMB = 3, 3′, 5, 5′-tetramethylbenzidine) are used as structural templates and cations to regulate the structure of inorganic anions (0D, 1D) and then regulate the luminescence properties of the materials. Among them, the materials with one-dimensional inorganic structures show typical semiconductor behavior, and their electrical conductivity increases with the increase of temperature. The inorganic part of this series of compounds has large structural distortion, large bandgap, significant Stokes shift, and wideband emissions. It has a long fluorescence lifetime, ranging from nanosecond to millisecond. More interestingly, they realize the controllable adjustment of the colour of fluorescent light emitted from yellow-green light, yellow light, orange-red light to near-white light. This work provides a new structure model for understanding the structure-activity relationship between structure and luminescence properties.