Research Of Synthesis And Luminescence Properties Of Rare Earth Ions Doped CLBO Phosphors

Compact fluorescent lamps,as the second generation light source,is still widely used in indoor lighting because of its low energy-costing than incandescent lamps and a higher color rendering than LED.The commercial red phosphor performs a great luminescence,which simultaneously exists the problems such as high cost and energy consumption.If substitution with the commercial phosphor could be found,there is no doubt that high efficient lighting source could be promoted into more families since the lower pressure of production.Quite a long time,in comparison to Eu²⁺ activated long-lasting phosphor,few reports focus on Eu³⁺ activated long-lasting material.In this work,various of rare earth ions doped Ca₄LaO?BO₃?₃ host phosphors have been successfully synthesized via the facile high temperature solid state method.?1?A series of Eu³⁺ singly-doped Ca₄LaO?BO₃?₃ have been synthesized.Luminescence properties of the samples as the function of Eu³⁺ dopant concentration have been investigated.The result shows that with the dopant concentration increasing,luminescence intensities monotonously enhance,which means that concentration quenching does not occur in Ca₄LaO?BO₃?₃ host.?2?The luminescence properties and the afterglow properties of Ca₄LaO?BO₃?₃ singly-doped Eu³⁺ in low concentration have been investigated in detail.Peaks in the PL spectra of Eu³⁺-doped Ca₄LaO?BO₃?₃ in low concentration show different from the sample in high dopant concentration.Afterglow could be observed when the excitation source was removed.?3?The Ca₄LaO?BO₃?₃ phosphor,namely the sample which La³⁺ totally replaced by Eu³⁺ could be a suitable candidate for compact fluorescent lamps,which confirms by taking commercial red phosphor Y₂O₃:Eu³⁺ in comparison through the luminescence intensity and quantum yield.?4?Ca₄La_1-xO?BO₃?₃:x Tb³⁺ phosphors have been synthesized via solid state method.Luminescence properties as the function of Tb³⁺ dopant concentration has been investigated.?5?A suite of Tb³⁺ and Eu³⁺ co-doped Ca₄LaO?BO₃?₃ phosphors have been prepared.Energy transfer process has been detected between Tb³⁺ and Eu³⁺ in Ca₄LaO?BO₃?₃ host through steady spectra and fluorescence lifetime.Luminescent color of co-doped samples could be tunable from green to red via changing Eu³⁺ content.?6?Other rare earth ions doped Ca₄LaO?BO₃?₃ phosphors have been synthesized and makes preliminary research.