Cao Peisheng, Zheng Haoyue, Wu Peng
College of Chemistry, Sichuan University, Chengdu, 610064, China.
Analytical & Testing Center, Sichuan University, Chengdu, 610064, China.
Nat Commun. 2022 Sep 29;13(1):5712. doi: 10.1038/s41467-022-33540-1.
Designing organic fluorescent and phosphorescent materials based on various core fluorophore has gained great attention, but it is unclear whether similar luminescent units exist for inorganic materials. Inspired by the BX octahedral structure of luminescent metal halide perovskites (MHP), here we propose that the BX octahedron may be a core structure for luminescent inorganic materials. In this regard, excitation-dependent color-tunable phosphorescence is discovered from α-AlF featuring AlF octahedron. Through further exploration of the BX unit by altering the dimension and changing the center metal (B) and ligand (X), luminescence from KAlF, (NH)AlF, AlCl, Al(OH), GaO, InCl, and CdCl are also discovered. The phosphorescence of α-AlF can be ascribed to clusterization-triggered emission, i.e., weak through space interaction of the n electrons of F atoms bring close proximity in the AlF octahedra (inter/intra). These discoveries will deepen the understanding and contribute to further development of BX octahedron-based luminescent materials.
基于各种核心荧光团设计有机荧光和磷光材料已引起广泛关注，但尚不清楚无机材料是否存在类似的发光单元。受发光金属卤化物钙钛矿（MHP）的BX八面体结构启发，在此我们提出BX八面体可能是发光无机材料的核心结构。就此而言，从具有AlF八面体的α-AlF中发现了依赖于激发的颜色可调磷光。通过改变维度以及改变中心金属（B）和配体（X）对BX单元进行进一步探索，还发现了KAlF、(NH)AlF、AlCl、Al(OH)、GaO、InCl和CdCl的发光。α-AlF的磷光可归因于聚集触发发射，即F原子的n电子在AlF八面体（内/间）中通过空间的弱相互作用使它们紧密靠近。这些发现将加深对基于BX八面体的发光材料的理解，并有助于其进一步发展。
