Dual-Emission from a Single-Phase Eu鈥揂g Metal鈥揙rganic Framework: An Alternative Way to Get White-Light Phosphor
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- 作者：Yu Liu ; Mei Pan ; Qing-Yuan Yang ; Lei Fu ; Kang Li ; Shi-Chao Wei ; Cheng-Yong Su
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：May 22, 2012
- 年：2012
- 卷：24
- 期：10
- 页码：1954-1960
- 全文大小：392K
- 年卷期：v.24,no.10(May 22, 2012)
- ISSN：1520-5002
文摘
A new bifunctional NTB (tris(benzimidazol-2-ylmethyl)amine)-type ligand incorporating coordination discriminable tripodal benzimidazolyl and monodentate pyridyl groups, tris((pyridin-3-ylmethyl)benzoimidazol-2-ylmethyl)amine (3-TPyMNTB), has been prepared to assemble 4d鈥?f heterometallic three-dimensional metal鈥搊rganic frameworks (MOFs) in a stepwise route: (1) direct reaction of 3-TPyMNTB with Ln(ClO4)3 affords monomeric complexes [Eu(3-TPyMNTB)2](ClO4)3路2.5MeCN (1-Eu) and [Gd(3-TPyMNTB)2](ClO4)3路2MeCN路2CHCl3 (1-Gd), and (2) assembly of the precursors 1-Eu and 1-Gd with AgClO4 gives rise to infinite MOFs [EuAg3(3-TPyMNTB)2(H2O)(MeCN)](ClO4)6路4MeCN (2-Eu-Ag) and [GdAg3(3-TPyMNTB)2(H2O)(MeCN)](ClO4)6路4MeCN (2-Gd-Ag), respectively. In monomer 1-Eu, the ligand shows an antenna effect to transfer absorbed energy to Eu3+ center to emit characteristic red luminescence, while in 4d鈥?f heterometallic MOF 2-Eu-Ag, the ligand centered emission is resensitized by Ag+ ions to generate dual emissions, coming up with the direct white-light emission from a single crystal. The detailed photoluminescent study has been carried out in both solid state and solution to elucidate the emission nature.