Intense violet-blue emitting (CaCl2/SiO2) : Eu2+ phosphor powders for applications in UV-LED based phototherapy illuminators
نویسندگان
چکیده
An intense violet–blue emitting (CaCl2/SiO2) : Eu2+ phosphor with a composition of 25% CaCl2 and 75% SiO2 is prepared by a solid state reaction. The phosphor emits at 427 nm with a narrow bandwidth of 21 nm. The photoluminescence (PL) intensities and fluorescence lifetimes are studied as a function of Eu2+ concentrations. It is observed that the PL intensity of (CaCl2/SiO2) : Eu2+ can be 30% higher than that of commercial Sr2P2O7 : Eu2+ phosphor under 395 nm excitation. (CaCl2/SiO2) : Eu2+ would be a promising new phosphor for converting near-ultraviolet radiation to violet–blue emission for a novel phototherapy illuminator using a near-ultraviolet (∼395 nm) light emitting diode as the excitation source.
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