Thermal Stability of Europium(III) Chelate Encapsulated by Sol-Gel Glass
نویسندگان
چکیده
In order to improve the stability of high color-purity red phosphors for ultraviolet excitation, we encapsulated an Eu-chelate, Eu(HFA)3(TPPO)2, by sol-gel derived glass networks and studied its thermal stability as well as photoluminescence (PL) characteristics. The PL quantum yield of an encapsulated sample was ten times higher than that without encapsulation after annealing at 160 °C for 2 hours in air. Three-dimensional glass networks with a sufficient density were shown to reduce thermal quenching of Eu(HFA)3(TPPO)2. Therefore, it is revealed that the surface coating of luminous chelates by sol-gel glasses is an effective way of inorganic and organic hybridization for high-stability of chelate bonding against free-oxygen and water. Keyword: Composite materials, Sol-gel processes, Optical properties, Luminescence,
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