Synthesis, modulation, and characterization of Ln3+ ions doped metal−organic frameworks for WLED applications. (January 2023)

• Record Type: Journal Article
• Authors: Yu, Z.; Kang, S.; Tai, M.; Wang, J.; Tian, Q.; Jin, D.; Wang, L.
• Is Part Of: Dyes and pigments. Volume 209(2023)Supplement Part A
• Publication Date: 2023-01
• Subjects: Lanthanide ions -- MOF -- Antenna effect -- White light emission; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2022.110897
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Isostructural lanthanide metal−organic frameworks (MOFs) are synthesized by the spontaneous self-assembly of lanthanide ions (Ln = La 3+, Tb 3+ and Eu 3+ ) with H3 cpioa (5-(4-carboxy-lphenoxy)-isophthalic) ligands. Based on the detailed study on the structural properties, it's found that different Ln ions have identical coordination environment in Ln(cpioa) MOF. By adjustment of the molar ratio of Ln ions, the chromaticity of Ln(cpioa) MOF can be easily modulated. La0.9 Tb0.093 Eu0.007 (cpioa) (CIE coordinate: (0.319, 0.331)) shows a white emission very close to pure white-light (0.333, 0.333) with a high quantum yields of 54.74%. Furthermore, corresponding white LED devices were fabricated, which indicates Ln(cpioa) MOF might be a promising candidate phosphor for the WLED applications. Graphical abstract: Image 1 Highlights: Three stable isostructural lanthanide metal−organic frameworks (MOFs) Ln(cpioa) (Ln = La 3+, Tb 3+, Eu 3+ ) with high luminescent efficiency are synthesized by a facile hydrothermal method. Based on the tunable chromaticity of Tb 3+ and Eu 3+ co-doped Ln(cpioa) MOFs, a white light emission MOF: La0.9 Tb0.093 Eu0.007 (cpioa) (CIE coordinate: (0.319, 0.331)) with a high quantum yield of 54.74% was obtained. Two feasible energy transfer mechanisms: the "Antenna Effect" and the dipole-dipole interactions in the framework were discussed in details. LED devices with different colors were also fabricated and results indicate that Ln(cpioa) MOF might be a promising candidate phosphor for the WLED applications.