Hydrothermal synthesis, characterization, and luminescence of Ca2B2O5:RE (RE = Eu3+, Tb3+, Dy3+) nanofibers

• Published in: Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2016-04, Vol.18 (4), Article 94
• Main Authors: Yang, Li, Wan, Yingpeng, Li, Yuze, Pu, Yinfu, Huang, Yanlin, Chen, Cuili, Seo, Hyo Jin
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Inorganic Chemistry; Lasers; Materials Science; Nanotechnology; Optical Devices; Optics; Photonics; Physical Chemistry; Research Paper
• ISSN: 1388-0764; 1572-896X
• DOI: 10.1007/s11051-016-3372-7

Ca 2 B 2 O 5 :RE (RE = Eu 3+ , Tb 3+ , Dy 3+ ) nanofibers were synthesized by the hydrothermal reaction method. The structural refinement was conducted on the base of the X-ray powder diffraction (XRD) measurements. The surface properties of the Ca 2 B 2 O 5 :RE (RE = Eu 3+ , Tb 3+ , Dy 3+ ) nanofibers were investigated by the measurements such as the scanning electron microscope (SEM), transmission electron microscope (TEM), and the energy dispersive spectrum (EDS). The nanofiber has a diameter of about 100 nm and a length of several micrometers. The luminescence properties such as photoluminescence excitation (PLE) and emission spectra (PL), decay lifetime, color coordinates, and the absolute internal quantum efficiency (QE) were reported. Ca 2 B 2 O 5 :Eu 3+ nanofibers show the red luminescence with CIE coordinates of ( x  = 0.41, y  = 0.51) and the luminescence lifetime of 0.63 ms. The luminescence of Ca 2 B 2 O 5 :Tb 3+ nanofibers is green color ( x  = 0.29, y  = 0.53) with the lifetime of 2.13 ms. However, Dy 3+ -doped Ca 2 B 2 O 5 nanofibers present a single-phase white-color phosphor with the fluorescence decay of 3.05 ms. Upon near-UV excitation, the absolute quantum efficiency is measured to be 65, 35, and 37 % for Eu 3+ -, Tb 3+ -, Dy 3+ -doped Ca 2 B 2 O 5 nanofibers, respectively. It is suggested that Ca 2 B 2 O 5 :RE (RE = Eu 3+ , Tb 3+ , Dy 3+ ) nanofibers could be an efficient phosphor for lighting and display.