Systematic Approach of One-Dimensional Lead Perovskites with Face-Sharing Connectivity to Realize Efficient and Tunable Broadband Light Emission

Recently, two-dimensional (2D) hybrid lead halide perovskite has been widely utilized as a preferred platform of optoelectronic material with tailorable compositions, structures, and intrinsic broadband emission properties, and this achievement significantly promotes the research desirability to explore a new type of halide prototype to mimic the 2D perovskite model. Herein, we first performed a systematic approach on one-dimensional (1D) perovskite and realized comparable performances in both structural and property modulations. Specifically, by choosing diversified organic cations as a structural design strategy, we successfully constructed a series of 1D APbBr 3 (A = DBU, 1,8-diazabicyclo[5.4.0]undec-7-ene; DMTHP, 5,5-dimethyl-1,4,5,6-tetrahydropyrimidine; DBN, 1,5-diazabicyclo[4.3.0]-5-nonene; EPD, 1-ethylpiperidine) homologues based on identical 1D face-shared octahedral [PbBr 3 ] − chains. This structural model features large accommodation ability for a variety of organic blocks enabling diversified photoluminescence (PL) properties from broadband yellow to white light emissions. Most remarkably, [DBU]PbBr 3 displays broadband yellow (0.47, 0.45) and white (0.32, 0.36) light emissions from two excited centers corresponding to distinct self-trapped excitons (STEs). These efficient dual light emissions were verified by high photoluminescence quantum yields (PLQYs) of 5.47 and 5.17%, respectively. The multiple advantages of unified crystal lattice, tailorable chemical composition, and tunable PL performance enable this 1D APbBr 3 perovskite to be an emerging and standard structural prototype to diversify and optimize the optoelectronic properties with potential in single-component white-light-emitting diodes.