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Temperature-Dependent Dual Fluorescence and Phosphorescence of Low-Dimensional Hybrid Cadmium Halides
Jiapeng Li1,2, Ping Li1, Li Yuan1
1Research institute of Optoelectronic Functional Materials, School of Chemistry, Chemical Engineering and Materials, Jining University, Qufu, Shandong 273155, P. R. China.
Abstract:
Organic-inorganic hybrid metal halides (OIHMHs) have undergone advanced development due to their exceptional photophysical properties and the increasing demands in optoelectronic applications. It is significant to perform a structural design strategy to realize tunable multicolor luminescence in OIHMHs. In this study, three new cadmium-based OIHMH single crystals─[PzPy]CdCl4 (PzPy = 3-(2-pyridyl)pyrazole), [APd]2Cd2Cl8·2H2O (APd = 3-aminopiperidine), and [APrIm]Cd2Cl6 (APrIm = N-(3-aminopropyl)-imidazole)─were prepared via a facile saturated crystallization method with adjustable anionic skeletons of 0D [CdCl4]2- tetrahedron, 1D [Cd2Cl8]4- chain, and 2D [Cd2Cl6]2- layer, respectively. Under UV light excitation, these hybrid cadmium halides exhibit temperature-dependent broadband blue fluorescence and green phosphorescence. Comprehensive spectroscopic investigations suggested that the dual fluorescence and phosphorescence are attributed to singlet- and triplet-state self-trapped excitons (STEs), respectively. Therefore, solid-state light-emitting diodes were realized based on these cadmium-based OIHMHs. In brief, this work offers a new perspective on modifying the structure and luminescent properties of hybrid metal halides, which will promote the rational design of low-dimensional (1D) OIHMHs with excellent luminescence performance in the future.
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