Luminescent properties and energy transfer of CaO:Ce 3+ , Mn 2+ phosphors for white LED
| Autor: | Yin Huijun, Liu Qipeng, Wei Lu, CuiQing Wang, Liu Tao, Hongpeng You, Riqiang Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Photoluminescence
Chemistry Energy transfer Biophysics Analytical chemistry Phosphor 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Decay curve 0104 chemical sciences Ion Emission band Concentration quenching 0210 nano-technology Luminescence |
| Zdroj: | Journal of Luminescence. 177:349-353 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2016.05.014 |
| Popis: | We have synthesized yellow–orange CaO:Ce3+,Mn2+ phosphors by solid-state reaction. Photoluminescence properties and energy transfer mechanism from Ce3+ to Mn2+ ions have been investigated. The Ce3+ activated phosphors exhibit strong absorption in the range of 250–490 nm and a yellow emission centered at 554 nm. When Mn2+ ions were codoped, CaO:Ce3+,Mn2+ phosphors exhibit yellow emission band of Ce3+ as well as orange emission band centered at 600 nm of Mn2+. We observed an efficient energy transfer from Ce3+ to Mn2+ ions in CaO:Ce3+,Mn2+, which was verified from the lifetime decay curves and was discussed by Dexter׳s energy transfer theory. The critical distance of the energy transfer from Ce3+ to Mn2+ ions has also been calculated to be 12.3 A by spectral overlap methods following Dexter׳s theory and by concentration quenching mechanism to be 15.2 A. Moreover, by combining the synthesized phosphors and InGaN blue chip (460 nm), warm-white light has been created. |
| Databáze: | OpenAIRE |
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