摘要
采用高温固相法制备单相Ba_3Gd(BO_3)_3:Ce^(3+),Tb^(3+)荧光粉,利用XRD、SEM、激光粒度仪和光致发光光谱分别对其物相、形貌、粒度分布和发光性能进行表征。结果表明:样品的粒度主要集中在1.5~2.0μm,颗粒表面光滑。激发光谱主要由Ce^(3+)和Tb^(3+)离子的4f-5d特征跃迁组成。在Ce^(3+)离子的特征激发下(350 nm),样品呈现Ce^(3+)离子的5d-4f宽带发射和Tb^(3+)离子的f-f锐利发射;主峰为544 nm,对应于Tb^(3+)离子的5D4→7F5跃迁。随着Tb^(3+)掺杂量的增加,Ce^(3+)离子的发射强度逐渐下降,Tb^(3+)离子的发射强度先增强后减弱;最佳掺杂量为20%。样品中存在Ce^(3+)向Tb^(3+)的能量传递,其传递效率为33.9%。样品的发光颜色可从蓝光调整到绿色区域。样品可应用于UV-LED中。
single-phased phosphor Ba_3Gd（ BO_3）_3： Ce^3＋,Tb^3＋ was prepared by high-temperature solidphase method. Its structure,morphology,particle size distribution and luminescence properties were characterized by X-Ray powder diffraction（ XRD）,laser particle size analyzer, scanning electron microscope（ SEM）,and photoluminescence spectrum,respectively. The results show that the particle size is 1. 5 ～2. 0 μm with smooth surface. Excitation spectrum consists of 4f-5d characteristic transitions of Tb^3＋and Ce^3＋ions. Under excitation characteristic of Ce^3＋at 350 nm,the samples present a broadband emission of Ce^3＋（ 5d-4f） and some f-f transitions of Tb^3＋. The strongest emission at 544 nm corresponds to5D4→7F5transition of Tb3 ＋. With increasing of Tb^3＋concentration,the emission intensity of Ce^3＋ions decreases. The Tb^3＋emission intensity increases then decreases. The optimum concentration is 20%. The energy transfer from Ce^3＋to Tb^3＋obviously occurs. The energy transfer efficiency is 33. 9%. The emission colors of the sample can be tuned from blue to green area. This phosphor can be used in the UV-LED.
出处
《陕西理工学院学报（自然科学版）》
2016年第3期16-20,共5页
Journal of Shananxi University of Technology:Natural Science Edition
