Color-fading reaction mechanisms of TiO2-coated photoluminescent materials
This paper presented underlying methylene blue (MB) color-fading mechanisms by photoluminescence-photocatalysis (PL-PC) reaction with PL materials coated with titanium dioxide (TiO2). The color fading mechanism means the photocatalytic degradation of organic dye by the coated TiO2 photocatalyst. The photocatalyst is activated by photoluminescent material. For PL materials, SrAl2O4:Eu2+,Dy3+ (SAOED) and water resistant SAOED were selected for its long-lasting after-glow characteristics and well-known PL effect. All the tests were performed on a solution basis. The TiO2 coating played an important role in the subsequent MB color-fading reactions as revealed by a comparative study performed in dark and white light conditions. The presented results also revealed that the MB color-fading reaction involves two major mechanisms. The first mechanism is adsorption by the hydrolysis product of SAOED, that is, Al(OH)3. The second is photocatalytic degradation by the TiO2 coating layer activated by the photoluminescent light. These results revealed color-fading mechanisms by PL-PC, which have potential for mechanochromic sensing characteristics since the tested materials are known to have mechanoluminescence properties.
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Document Type: Research Article
Publication date: April 1, 2018
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