Zheng ChangRan, Liu QuanSheng
School of Materials Science and Engineering, Changchun University of Science and Technology Changchun 130022 Jilin China
RSC Adv. 2019 Oct 18;9(58):33596-33601. doi: 10.1039/c9ra07107e.
Persistent luminescence (PPL) materials have gained lots of attention and have been widely used in traffic signs, displays, medical diagnosis and architectural decoration. Single ion doped PPL materials with stable emission are excellent for practical applications, but it is difficult to cover the entire wavelength range. Here, a new cyan long-lasting phosphor CaSnO:Lu was successfully synthesized at 1200 °C by the conventional high temperature solid state method. From the X-ray photoelectron spectroscopy (XPS), it can be concluded that the Sn ions exist in the crystal lattice because the doping of Lu ions changes the valence state of the Sn ions. According to the thermally simulated luminescence (TSL), the continuous afterglow of CaSnO:Lu phosphors is produced by appropriate hole or electron traps, which are caused by doping the calcium stannate host with rare earth ions (Lu). The long-lasting phosphorescence (LLP) properties of the cyan phosphor were first discussed and the afterglow mechanism was expounded in detail. The excitation and the emission spectra of the phosphor revealed the characteristic broad peak of the Sn ion. Typical afterglow behavior of the CaSnO:Lu phosphors was exhibited after power was turned off.
持久发光（PPL）材料已引起广泛关注，并已广泛应用于交通标志、显示器、医学诊断和建筑装饰等领域。具有稳定发射的单离子掺杂PPL材料在实际应用中表现出色，但难以覆盖整个波长范围。在此，通过传统的高温固态法在1200℃成功合成了一种新型青色长余辉荧光粉CaSnO:Lu。从X射线光电子能谱（XPS）可知，由于Lu离子的掺杂改变了Sn离子的价态，Sn离子存在于晶格中。根据热模拟发光（TSL），CaSnO:Lu荧光粉的持续余辉是由适当的空穴或电子陷阱产生的，这些陷阱是通过用稀土离子（Lu）掺杂锡酸钙基质而形成的。首次讨论了青色荧光粉的长余辉（LLP）特性，并详细阐述了余辉机理。荧光粉的激发光谱和发射光谱显示出Sn离子的特征宽峰。关闭电源后，CaSnO:Lu荧光粉表现出典型的余辉行为。
