State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Phys Chem Chem Phys. 2010 Jul 21;12(27):7620-5. doi: 10.1039/b922230h. Epub 2010 Jun 14.
Yb(3+), Er(3+), and Tm(3+)-codoped Gd(2)O(3) nanotubes were synthesized via a simple wet-chemical route at low temperature and ambient pressure followed by a subsequent heat treatment at 800 degrees C. X-Ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), upconversion (UC) emission spectra, and kinetic decay were used to characterize the samples. Bright white UC luminescence in the nanotubes was observed under diode laser excitation of 980 nm. The white light consists of the blue ((1)G(4)-->(3)H(6) of Tm(3+)), green ((2)H(11/2)/(4)S(3/2)-->(4)I(15/2) of Er(3+)), and red ((4)F(9/2)-->(4)I(15/2) of Er(3+)) UC emissions. As the excitation power density changed in the range of 20-200 W cm(-2), the calculated CIE color coordinates shift only slightly and fall well within the white region. This material may be a potential candidate for applications of color displays, lighting and photonics.
Yb(3+)、Er(3+) 和 Tm(3+)-共掺杂 Gd(2)O(3) 纳米管是通过在低温和常压下的简单湿化学路线合成的，然后在 800°C 下进行后续热处理。X 射线衍射 (XRD)、场发射扫描电子显微镜 (FE-SEM)、热重分析 (TGA)、上转换 (UC) 发射光谱和动力学衰减用于表征样品。在 980nm 激光二极管激发下，观察到纳米管中发白光的 UC 发光。白光由蓝色 ((1)G(4)-->(3)H(6) 的 Tm(3+))、绿色 ((2)H(11/2)/(4)S(3/2)-->(4)I(15/2) 的 Er(3+)) 和红色 ((4)F(9/2)-->(4)I(15/2) 的 Er(3+)) UC 发射组成。当激发功率密度在 20-200 W cm(-2)范围内变化时，计算出的 CIE 颜色坐标仅略有偏移，完全落在白色区域内。这种材料可能是用于彩色显示器、照明和光子学应用的潜在候选材料。
