Room-temperature fabrication of nanocrystalline CePO₄:Tb³⁺ films by SILAR method and their luminescence-switching properties

抄録

A method was developed to fabricate luminescent films at around room temperature based on successive ionic layer adsorption and reaction (SILAR). Nanocrystalline CePO₄:Tb³⁺ films were deposited on bare or surface-modified silica glass substrates through immersion in cation (Ce³⁺ and Tb³⁺) and anion (PO₄³⁻) solutions successively. Experimental conditions for the successful deposition of the films were explored to obtain better luminescent properties related to redox sensibility. The intensity of photoluminescence from CePO₄:Tb³⁺ was increased linearly with increasing the number of SILAR cycles. Sensibility of the nanocrystalline CePO₄:Tb³⁺ films against the oxidation by KMnO₄ and the reduction by L(+)-ascorbic acid in aqueous solutions was proved to be superior to that of a dense and flat CePO₄:Tb³⁺ film fabricated by a common sol–gel dip-coating method.