期刊
PRAMANA-JOURNAL OF PHYSICS
卷 70, 期 2, 页码 313-321出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12043-008-0050-z
关键词
semiconductor; luminescence; lanthanide ions; nanoparticles; re-dispersible
Re-dispersible CdS, 5 at.% Eu3+-doped CdS, 2 at.% Li+ and 5 at.% Eu3+ co-doped CdS nanoparticles in organic solvent are prepared by urea hydrolysis in ethylene glycol medium at a low temperature of 170 degrees C. CdS nanoparticles have spherical shape with a diameter of similar to 80 nm. The asymmetric ratio (A(21)) of the integrated intensities of the electrical dipole transition to the magnetic dipole transition for 5 at.% Eu3+-doped CdS is found to be 3.8 and this ratio is significantly decreased for 2 at.% Li+ and 5 at.% Eu3+ co-doped CdS (A(21) = 2.6). It establishes that the symmetry environment of Eu3+ ion is more favored by Li-doping. Extra peak at 550 nm (green emission) could be seen for 2 and 5 at.% Eu3+ co-doped CdS. Also, the significant energy transfer from host CdS to Eu3+ is found for 5 at.% Eu3+-doped CdS compared to that for 2 at.% Li+ and 5 at.% Eu3+ co-doped CdS.
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