کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1497023 | 992982 | 2008 | 4 صفحه PDF | دانلود رایگان |
Er3+ doped ZnO nanoparticles were synthesized via chemical combustion method. Spectroscopic measurements show that Er3+ ion is partially doped into ZnO host and the existence of Li+ benefits Er3+ ions incorporation. The up-conversion (UC) spectra indicated that under excitation at 980 nm Er3+doped nanoparticles emit a strong red UC fluorescent band centered at 660 nm assigned to the transitions of 4F9/2 → 4I15/2 of Er3+ ion. A luminescent switching between the main red UC emission at 660 nm and green one centered at 535 nm and 557 nm assigned to the transitions of 2H11/2/4S3/2 → 4I15/2 was presented through Li+ co-doping. The origin of luminescent switching could be attributed to the modification of local crystal field around Er3+ ions due to the introduction of Li+ ions. Our results indicate that rare-earth-ions-doped ZnO nano-materials will have potential application in multicolor fluorescent labels.
Journal: Optical Materials - Volume 31, Issue 2, October–December 2008, Pages 338–341