磷光
化学
发光
青色
光化学
光致发光
金属
持续发光
激子
分子
荧光
纳米技术
光电子学
有机化学
光学
材料科学
物理
热释光
量子力学
标识
DOI:10.1021/acs.inorgchem.3c04618
摘要
Long persistent luminescence (LPL) materials open up a new avenue for information security, anticounterfeiting technology, and bioimaging thanks to their unique luminescence characteristics like ultralong exciton migration distances and multiple-colored light emission. As materials that have value for commercial applications, they attract much attention. In this paper, inexpensive, accessible, and eco-friendly niacin is used as a ligand to combine with the universally used metal ion Zn(II) to form a crystallized metal-organic complex dubbed Zn-NA. The named material possesses an ultralong room-temperature phosphorescence (RTP) with a lifetime of up to 265 ms under the atmosphere and up to 446 ms at 77 K. Notably, it exhibits a bright and multimode (excitation- and temperature-dependent) color-tunable LPL that changes from blue to cyan and then to yellow-green upon removal of the irradiation sources. Depending on its photoluminescence and theoretical calculations, the observed long-lived RTP of Zn-NA can be attributed to the coexistence of a single-molecule state induced by the heavy atom effect and an aggregated state within a dense crystalline structure.
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