SrZrO3:Er,Yb荧光粉的上转换发光特性研究

Upconversion Luminescence Properties of SrZrO3:Er,Yb Phosphor

采用高温固相法制备出SrZrO3∶Er,Yb上转换发光材料,用XRD、拉曼光谱和荧光光谱对其结构和上转换荧光特性进行表征和分析。XRD和拉曼光谱结果表明,得到的SrZrO3∶Er,Yb为正交相结构。980nm激发下,SrZrO3∶Er荧光粉存在较强的上转换发光,在533nm、557nm和688nm处存在两个绿色发射带和一个红色发射带,Yb^3+的掺杂能够显著提高其上转换发光效率。SrZrO3∶Er,Yb中Er^3+的猝灭浓度为1.0%,Yb^3+的猝灭浓度为15%。通过研究发光强度随激发功率的关系,探究了Er^3+和Yb^3+双掺杂体系的发光机制,证实533nm、557nm处的绿光发射以及688nm处的红光发射都是双光子过程。

SrZrO3∶Er,Yb up-conversion phosphors were synthesized by high temperature solid-state method.The phase structure and fluorescence properties were characterized and analyzed by XRD,Raman and fluorescence spectra.The results prove that the crystal phase of the prepared samples is orthorhombic phase and the doping of rare earth ions does not change the crystal structure.Under the excitation of 980 nm,SrZrO3∶Er phosphors exhibit up-conversion emission at 533 nm,557 nm and 688 nm in green and red region.The up-conversion emission is greatly enhanced after Yb doping because of the energy transition between Er and Yb.The upconversion emission intensity is dependent on the concentrations of Yb^3+ions and reaches a maximum at 15%.Logarithmic plots of power dependencies reveal that both the green and red emissions at 533 nm and 557 nm originate from a two-photon up-conversion process.Based on the photon energy and the emission spectra,the possible upconversion processes and emission mechanisms are discussed.