State Key laboratory for Powder Metallurgy, Central south University, Changsha, Hunan 410083, People's Republic of China.
Nanoscale. 2013 Dec 21;5(24):12518-31. doi: 10.1039/c3nr04185a.
Novel near-UV and blue excited Eu(3+), Tb(3+)-codoped one dimensional strontium germanate full-color nano-phosphors have been successfully synthesized by a simple sol-hydrothermal method. The morphologies, internal structures, chemical constitution and optical properties of the resulting samples were characterized using FE-SEM, TEM, HRTEM, EDS, XRD, FTIR, XPS, PL and PLE spectroscopy and luminescence decay curves. The results suggested that the obtained Eu(3+), Tb(3+)-codoped strontium germanate nanowires are single crystal nanowires with a diameter ranging from 10 to 80 nm, average diameter of around 30 nm and the length ranging from tens to hundreds micrometers. The results of PL and PLE spectra indicated that the Eu(3+), Tb(3+)-codoped single crystal strontium germanate nanowires showed an intensive blue, blue-green, green, orange and red or green, orange and red light emission under excitation at 350-380 nm and 485 nm, respectively, which may attributed to the coexistent Eu(3+), Eu(2+) and Tb(3+) ions, and the defects located in the strontium germanate nanowires. A possible mechanism of energy transfer among the host, Eu(3+) and Tb(3+) ions was proposed. White-emission can be realized in a single-phase strontium germanate nanowire host by codoping with Tb(3+) and Eu(3+) ions. The Eu(3+), Tb(3+)-codoped one-dimensional strontium germanate full-color nano-phosphors have superior stability under electron bombardment. Because of their strong PL intensity, good CIE chromaticity and stability, the novel 1D strontium germanate full-color nano-phosphors have potential applications in W-LEDs.
通过简单的溶胶-水热法成功合成了新型近紫外和蓝色激发的 Eu(3+)、Tb(3+)共掺杂一维 SrGeO4 全彩色纳米荧光粉。采用 FE-SEM、TEM、HRTEM、EDS、XRD、FTIR、XPS、PL 和 PLE 光谱以及荧光衰减曲线对所得样品的形貌、内部结构、化学组成和光学性能进行了表征。结果表明，所得 Eu(3+)、Tb(3+)共掺杂 SrGeO4 纳米线为单晶纳米线，直径为 10-80nm，平均直径约 30nm，长度为数微米至数百微米。PL 和 PLE 光谱的结果表明，Eu(3+)、Tb(3+)共掺杂单晶 SrGeO4 纳米线在 350-380nm 和 485nm 激发下分别显示出强烈的蓝色、蓝绿色、绿色、橙色和红色或绿色、橙色和红色光发射，这可能归因于共存的 Eu(3+)、Eu(2+)和 Tb(3+)离子以及位于 SrGeO4 纳米线中的缺陷。提出了一种在 SrGeO4 纳米线中能量从主体、Eu(3+)和 Tb(3+)离子之间转移的可能机制。通过共掺杂 Tb(3+)和 Eu(3+)离子，可以在单相 SrGeO4 纳米线主体中实现白色发射。Eu(3+)、Tb(3+)共掺杂一维 SrGeO4 全彩色纳米荧光粉在电子束轰击下具有优异的稳定性。由于其较强的 PL 强度、良好的 CIE 色度和稳定性，新型一维 SrGeO4 全彩色纳米荧光粉在 W-LED 中有潜在的应用。
