Structure and photoluminescent properties of microstructural YBO3 : Eu3+ nanocrystals.
YBO3 : Eu3+ nanocrystals (NCs) were prepared by a hydrothermal method and characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy. The results demonstrate that morphology and structure of the NCs varied strongly with hydrothermal temperature. Their luminescent properties were investigated in comparison to the bulk. A large number of NO3- groups were adsorbed at the surface of hydrothermal products, which acted as luminescent killers; Two symmetry sites of Eu3+ ions in NCs, the interior and the surface sites, were identified by the site-selective excitation and time-resolved emission experiments; The intensity ratio of 5D0-7F2 to 5D0-7F, of EU3+ at the surface site increased greatly than that at the interior site; as a result, the chromaticity was improved; The total radiative transition rate of 5D0-sigmaJ7FJ for Eu3+ at the surface site was 3-5 times larger than that at the interior.
Pan
Guohui
G
Key Laboratory of Excited State Physics Changchun Institute of Optics, Fine Mechanics and Physics Chinese Academy of Sciences, Changchun 130033, P. R. China.
Song
Hongwei
H
Yul
Lixin
L
Liu
Zhongxin
Z
Bai
Xue
X
Lei
Yanqiang
Y
Fan
Libo
L
Lul
Shaozhe
S
Ren
Xinguang
X
D001881:Borates / Q000737:chemistry / Q000528:radiation effects; D017610:Calcium Compounds / Q000737:chemistry; D003460:Crystallization; D005063:Europium / Q000737:chemistry* / Q000528:radiation effects; D006358:Hot Temperature; D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D010777:Photochemistry / Q000379:methods*; D011208:Powders; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D017973:Tungsten Compounds / Q000737:chemistry; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry* / Q000528:radiation effects
D001881:Borates; D017610:Calcium Compounds; D011208:Powders; D017973:Tungsten Compounds; D005063:Europium; D015019:Yttrium; C018858:calcium tungstate