Sr_2CeO_4∶Dy^(3+)荧光粉的合成以及发光特性的研究

Investigation of Synthesis and Luminescent Properties of the Sr_2CeO_4∶Dy^(3+)

以亚甲基双丙烯酰胺为网络剂,采用高分子网络凝胶法合成了Sr2CeO4∶Dy3+荧光粉,并表征其结构、颗粒形貌及发光性能。研究结果表明:Sr2CeO4∶Dy3+无其他杂相存在且粉末颗粒大小均匀。其紫外-可见吸收带集中在480nm附近;在370nm紫外光激发下,其发射图谱为一多峰发射;监测470nm的发射峰,所得样品的激发谱为一双峰宽谱,峰位为292和338nm。同时研究了Dy3+掺杂浓度对样品发射光谱的影响,结果显示,随着Dy3+浓度的增大,其黄、蓝发射峰强度比值逐渐增大,但发光强度呈现先增大后减小的趋势,在Dy3+掺杂浓度为0.4mol%时达到最大值。

In the present article,Sr2CeO4∶Dy3＋ was synthesized with N,N-methylene bisacrylamide（MBAA） as the net agent.The structure,morphology and luminescent properties were also characterized.It is indicated that Sr2CeO4∶Dy3＋ was single-phased without other phase existing and also had good dispersion The UV-visible absorption spectra suggested that the absorption bands were almost at 480 nm.The excitation spectrum for 270 nm emission has several excitation bands;The emission spectrum of Sr2CeO4∶Dy3＋ shows two broad bands at 292 and 338 nm under the 370 nm excitation.The effects of Dy3＋ doping concentration on the emission spectrum intensity of Sr2CeO4∶Dy3＋ were also studied,the results showed that the ratio of yellow emission to blue emission increases with increasing the Dy3＋ doping concentration,but with increasing the Dy3＋ doping concentration,the emission intensity firstly increased,then decreased,and the maximal emission intensity was at 0.4mol% Dy3＋ concentration.