Abstract
Inspired by the ultraviolet induced properties of biological materials, we developed fluorescent wood as a new type of functional material which can be applied to anti-counterfeit label technology and wood-emitting artwork. This study discusses the influence of temperature, time, ligand ratio, and reactant concentration on the structure and properties of fluorescent wood with europium(III) ternary complexes. The surface morphology and fluorescent properties of the modified wood were characterized by scanning electron microscopy (SEM) and fluorescence spectrometry. The results showed that a high reaction temperature of 75 oC was beneficial in obtaining stronger fluorescent wood; a reaction time of 8 h exerted a significant influence on fluorescent wood when the reactant concentration of the sample was 0.03 mol/L. In addition, the results of infrared spectroscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray analysis showed that modification of wood takes place through the Si-OH groups of the silane coupling agent, which link to the surface of wood. After 120 hours of UV light irradiation, the surface fluorescence intensity of the modified wood can reach 500 arb. units. It can be considered that the modified wood has better anti-ultraviolet aging properties, thereby prolonging the life of poplar.
Highlights
Wood is a carbon-neutral material and does not result in a net increase in carbon dioxide due to cyclic carbon fixation during photosynthesis and degradation 1
In order to broaden the application of wood as a template material for optical functionality, this study describes a type of modified wood synthesized with europium ternary complexes; these modified woods, unlike untreated wood, exhibit fluorescence
The formation of chemical bonds on wood surfaces occurs due to modification with rare earth complexes (-Si-OC2H5 groups) in acid hydrolysis conditions, which generates a large number of Si-OH groups 12
Summary
Wood is a carbon-neutral material and does not result in a net increase in carbon dioxide due to cyclic carbon fixation during photosynthesis and degradation 1. Apart from usage in houses, furniture, artwork, heating, and decoration, wood and its derivative materials are widely used in green electronics 2, 3. With continuous development in the field of materials science, wood materials are increasingly being considered as biological templates with new properties 4. There are many studies on the production of superhydrophobic wood materials 6,7. Only a few wood types are being used as templates for the preparation of luminescent materials 8. It is well known that europium-based fluorescent complexes, which are red-light emitting phosphor materials, exhibit long luminescence lifetimes and sharp emission bands 9
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