蓝光激发KY(MoO4)2:Pr3+荧光粉微晶玻璃的制备及发光性能研究

Preparation of KY(MoO):Pr Phosphors Glass-ceramics and Its Luminescence Properties Under Blue Light Excitation

通过高温固相法,在550℃下煅烧4h,制备了KY(MoO4)2:Pr3+新型红色荧光粉,通过X射线衍射(XRD)和荧光光谱(PL),研究了其结构和发光性质。结果表明:煅烧温度为550℃、煅烧时间为4 h时,样品的发光强度最好;随着Pr3+浓度的变大,样品的发光强度不断增加,当Pr3+的摩尔掺杂量为4%时,样品的荧光强度达到最大,继续增加Pr3+的浓度,由于浓度猝灭,样品发光强度降低。KY(MoO4)2:Pr3+在456 nm处可被蓝光有效地激发,样品的发射峰波长主要位于609、627、657 nm处,其中在657 nm处发射出较强的红光。在不同Pr3+掺杂浓度下,KY(MoO4)2:Pr3+的色坐标均显示出相近的值,并且均位于红色区域。KY(MoO4)2:Pr3+有望用于蓝光激发白光发光二极管(白光LED)的红色荧光粉。

KY(MoO4)2:Pr3+new red phosphor was prepared by high temperature solid phase method through calcination at 550℃for 4 h.Its structure,morphology and luminescence properties were studied by X-ray diffractometry(XRD)and fluorescence spectroscopy(PL).The results showed that KY(MoO4)2:Pr3+could be effectively excited by blue light with excitation wavelength of 465 nm.The emission peak wavelength of the sample was mainly at 609 nm,627 nm and 656 nm,and strong red fluorescence was emitted at 656 nm.The effect of Pr3+ion doping concentration on the luminescence properties of KY(MoO4)2:Pr3+phosphors was studied.With the increase of Pr3+ion concentration,the luminescence intensity of the samples increased continuously.When the molar doping amount of Pr3+was 4%,the sample had the highest fluorescence intensity and then began to decrease due to concentration quenching.At different Pr3+ion doping concentrations,the color coordinates of KY(MoO4)2:Pr3+showed similar values and were all located in the red region.KY(MoO4)2:Pr3+is expected to be a red phosphor for white light-emitting diodes(white LEDs)excited by blue light.