Visible tunable lighting system based on polymer composites embedding ZnO and metallic clusters: from colloids to thin films.

Sci Technol Adv Mater

Laboratory for Innovative Key Materials and Structures (LINK), UMI 3629 CNRS-Saint Gobain-NIMS, National Institute for Materials Science (NIMS), Tsukuba, Japan; Optical and Electronic Materials Unit, NIMS, Tsukuba, Japan; NIMS-Saint-Gobain Center of Excellence for Advanced Materials, NIMS, Tsukuba, Japan.

Published: August 2016

The development of phosphor devices free of heavy metal or rare earth elements is an important issue for environmental reasons and energy efficiency. Different mixtures of ZnO nanocrystals with CsMoI(OOCF) cluster compound (CMIF) dispersed into polyvinylpyrrolidone matrix have been prepared by very simple and low cost solution chemistry. The resulting solutions have been used to fabricate highly transparent and luminescent films by dip coating free of heavy metal or rare earth elements. The luminescence properties of solution and dip-coated films were investigated. The luminescence of such a system is strongly dependent on the ratios between ZnO and CMIF amounts, the excitation wavelength and the nature of the system. By varying these two parameters (ratio and wavelength), a large variety of colors, from blue to red as well as white, can be achieved. In addition, differences in the luminescence properties have been observed between solutions and thin films as well as changes of CMIF emission band maximum wavelength. This may suggest some possible interactions between the different luminophore centers, such as energy transfer or ligands exchange on the Mo clusters.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5101959PMC
http://dx.doi.org/10.1080/14686996.2016.1202724DOI Listing

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