Abstract
Bismuth-based organic frameworks (BiOFs) can display interesting phosphorescent properties, but the relationship between structure and optical activity remains underexplored. The structure-dependent phosphorescence properties in the BiOFs are investigated using different multidentate ligands. In-depth analysis of the luminescence properties confirms that the densely packed framework shows long-lasting phosphorescence at room temperature, owing to an efficient electron-hole separation. The combination of spectroscopic analysis and single-crystal structural analysis provides important insights into the emission control through BiOFs structural change, which can be a useful strategy for modulating the optical properties of various metal organic frameworks. Furthermore, taking the advantage of long-lasting phosphorescence, the potential usage as an eco-friendly photocatalyst is demonstrated.
Highlights
Bismuth-based organic frameworks (BiOFs) can display interesting phosphorescent properties, but the relationship between structure and optical activity remains underexplored
While we are searching organic ligands that can chelate to Bi and contribute to the optical property of Bi, we have found a seminal work by Feyand et al.[9], describing bismuthbased organic frameworks (BiOFs) including Bi-pyromellitic acid complex (Bi-BTCA)
This work dose not discuss the phosphorescence property of the BiOFs in detail, since their complex is an important system to explore the structureluminescence property of Bi complexes by controlling the structure using diverse organic ligands, we revisit Bi-BTCA crystal, especially focusing on its phosphorescence property changes by comparing it with Bi-trimesic acid complex (Bi-BTC) crystal that offers different coordination number of Bi and interbismuth distance, because the luminescence of bismuth complexes is highly sensitive to their structure parameters such as interbismuth distance, etc
Summary
Bismuth-based organic frameworks (BiOFs) can display interesting phosphorescent properties, but the relationship between structure and optical activity remains underexplored. Relatively low cost and good chemical stability compared with the commonly used heavy metals Despite these advantages, phosphorescent properties derived from pure bismuth-based MOFs are rarely reported. This work dose not discuss the phosphorescence property of the BiOFs in detail, since their complex is an important system to explore the structureluminescence property of Bi complexes by controlling the structure using diverse organic ligands, we revisit Bi-BTCA crystal, especially focusing on its phosphorescence property changes by comparing it with Bi-trimesic acid complex (Bi-BTC) crystal that offers different coordination number of Bi and interbismuth distance, because the luminescence of bismuth complexes is highly sensitive to their structure parameters such as interbismuth distance, etc. Our study shows that BiOFs can be highly luminescent materials with a careful control of its structure and will extends the field of an eco-friendly catalyst beyond the precious metal-based MOF catalyst
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