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 APbBr3(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 [PbBr3]−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]PbBr3displays 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 APbBr3perovskite to be an emerging and standard structural prototype to diversify and optimize the optoelectronic properties with potential in single-component white-light-emitting diodes.