GdF3∶Er^3＋,Yb^3＋的合成和上转换发光特性

Synthesis and Upconversion Luminescence Properties of GdF_3∶Er^(3+),Yb^(3+)

采用水热法制备了Er3+离子浓度为3%,Yb3+离子浓度分别为10%,20%的GdF3∶Er3+,Yb3+。XRD结果表明:合成的样品均为正交结构的GdF3,Gd0.87Yb0.10Er0.03F3和Gd0.77Yb0.20Er0.03F3样品的晶粒尺寸分别为28和26nm。研究了980nm红外光激发的上转换发射光谱。结果表明:红光和绿光发射分别来自于Er3+离子的2H11/2,4S3/2→4I15/2和4F9/2→4I15/2跃迁。样品的绿光发射强度较红光发射强。但绿光和红光发射的相对强度比例与Yb3+离子浓度有关。对Gd0.87Yb0.10Er0.03F3和Gd0.77Yb0.20Er0.03F3样品中可能的上转换发光机制进行了讨论。

GdF3：Er^3＋,yb^3 with Er^3＋ ion of 3% and Yb^3＋ ion concentration of 10%, 20% have been prepared by a hydrothermal method. The results of XRD show that all the samples are of an orthorhombic structure. The average erystallite sizes estimated by Scherrer formula are 28 and 26 nm for Gdo.87Yb0.10Er0.03F3 and Gd0.77Yb0.20Er0.03F3, respectively. The Upeonversion luminescence spectra of the samples have been studied under 980 nm laser excitation. The results show that the green and red upconversion emission can be attributed to the 22H11/24S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er^3＋, respectively. The intensity of green emission is stronger than that of red emission for two samples. The ratio of the intensity of green to red emission is related to Yb^3＋ ion concentration. The possible upconversion luminescence mechanisms in Gd0.87Yb0.10Er0.03F3 and Gd0.77Yb0.20Er0.03F3 are discussed.