Luminescent hybrid materials

Figure 7.17 Luminescent hybrid materials with encapsulated chromophores...

Binnemans K (2009) Lanthanide-based luminescent hybrid materials. Chem Rev 109 4283 374... 

Li Q, Yan B (2012) Luminescent hybrid materials of lanthanide (3-diketonate and mesoporous host through the covalent and ion bonding with anion metathesis. Dalton Trans 41 8567-8573... 

Figure 11 Single-crystal X-ray structure of a luminescent hybrid material Tb(BTC) activated in methanol-containing NaF with the model of fluoride (green) at the center of the charmel involving its hydrogen bonding interaction with terminal methanol molecules, (b) Excitation (dotted) and PL spectra (solid) of Tb(BTC) solid activated in different concentrations of NaF methanol solution (Reprinted with permission from Ref 87. Copyright (2008) American Chemical Society.)...

In summary, metallomesogens of crown ethers are interesting compounds that combine a variety of properties (1) appropriate metal centers can show luminescence, (2) all properties can be tuned by the addition of alkaline metal salts to the crown ether, and (3) ordered, liquid crystalline phases are possible. With these hybrid materials, interesting applications can be foreseen in the near future. 

New luminescent hybrid mesoporous material was prepared by covalent anchoring rare earth complex onto MCM-41 by a postsynthesis approach. The monomer (referred to here as PABI) which plays double roles, i.e., as a ligand for lanthanide ion and as an organic functional molecule to modify MCM-41 is synthesized and characterized by H NMR and MS. The fluorescence spectra show clearly that the hybrid mesoporous material possesses excellent luminescence characteristics. The hybrid mesoporous material retains the structure of MCM-41 after modification. 

Scheme 1. Preparation of luminescent hybrid mesoporous material.

Li, H., Qi, W, Li, W. et al. (2005) A highly transparent and luminescent hybrid based on the copolymerization of surfactant-encapsulated polyoxometalate and methyl methacrylate. Advanced Materials, 17, 2688-2692. 

The luminescence of lanthanide ions in solids has been the subject of several books or chapters [1-12] and has an immense scope. Since 1 was asked to write this review within a short time, I have failed to give a comprehensive survey but have given a qualitative overview of several areas with some references to more quantitative treatments. Topics such as lanthanide luminescence of laser materials [4,8,13,14], sensors [15], hybrid materials [16], organolanthanide, and coordination compounds [17] are missing. So what is here in October 2009 - basically, a description of the luminescence spectra of lanthanide ions in the solid state and some applications of phosphor materials. 

For technological applications, the NIR-luminescent lanthanide complexes have to be incorporated into a stable matrix because of their poor thermal stability and low mechanical strength. So far, the incorporation of luminescent lanthanide complexes in matrices, as a result, the NIR-luminescent lanthanide hybrid materials, is of widespread interest in material science as it allows construction of functional materials with various optical properties. The study of NIR-luminescent lanthanide complexes in hybrid materials is not only of fundamental interest but these materials also have a high potential for different applications (optical amplifiers, optical waveguides, OLEDs, etc.). In general, these hybrid materials have superior mechanical properties and have a better processability than the pure lanthanide complexes. Moreover, embedding a lanthanide complex in a hybrid matrix is also beneficial for its thermal stability and luminescence output. ... 

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