YPO4：Tb荧光粉的制备及其VUV激发下的发光性能

采用共沉淀法制备了PDP用的绿色荧光粉YPO₄:Tb。XRD、SEM等测试手段表明用此方法制备的YPO₄:Tb相纯度高,所需的烧结温度低、颗粒分散性好、颗粒尺寸分布窄,且表面质量好。研究了YPO₄:Tb在真空紫外光(VUV)激发下的发光性能,并对VUV激发下的发光机理进行初步探索。

Preparation of YPO4: Tb and Its Luminescent Property under 147 nm Excitation

Lanthanide phosphates represent a class of materials with significant technological importance,and are extensively applied as laser,ceramic,sensor,and phosphor materials.Among various lanthanide phosphate compounds,the lanthanide doped lanthanide phosphates are extremely suitable for applications as phosphors owing to the transition between energy levels of lanthanide ions.The development and application of mercury-free lamps and plasma display panels(PDPs) induce considerable research interest in vacuum ultraviolet(VUV) excitation.Conventional solid-state reaction route requires high temperature calcinations,milling and grinding processes.The phosphor particles obtained by this method have an irregular shape,coarse surface,wide size distribution,and high aggregation.The solution co-precipitation technique was used to synthesize the green-emitting phosphor YPO₄:Tb.Results indicate that the YPO₄:Tb phosphor particles prepared by co-precipitation technique have almost spherical shape,smooth surface,narrow size distribution in 1~2μm range, and low aggregation.The VUV excitation and emissions under 147 nm excitation are investigated.The VUV excitation spectrum of Tb doped YPO₄ suggests that phosphors have a high Absorption near 147 nm,which is ascribed to the host Absorption.The luminous emission of YPO₄:Tb precipitates calcinated in 800~1000 ℃ increases with the increase of calcination temperature due to the improvement of crystallinity. The luminous efficiency of YPO₄:Tb obtained from solution co-precipitation is higher than that obtained from conventional solid state route.