Study of UV fluorescences induced from 4f3 → 4f2 d multistep absorptions of Nd3+ions in YLiF4 and LuLiF4 crystals
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| Format: | Artículo científico |
| Sprache: | en |
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Universidade Nove de Julho
2006
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| _version_ | 1876423194229866496 |
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| author | André Felipe Henriques Librantz |
| author_facet | André Felipe Henriques Librantz |
| contents | Study of UV fluorescences induced from 4f3 → 4f2 d multistep absorptions of Nd3+ions in YLiF4 and LuLiF4 crystals André Felipe Henriques Librantz Luiz Vicente Gomes Tarelho Laércio Gomes Izilda Márcia Ranieri Ingeniería UV transition Ultraviolet radiation Multiphotonic excitation process Nd3+ ultraviolet (UV) fluorescence induced by multiphotoniclaser excitations was studied in doped Nd:YLiF4 (YLF) andNd:LuLiF4 (LLF) crystals by using the time resolved spectroscopytechnique. The UV luminescences are due to transitionsbetween the 4f25d and the 4f3 electronic configurations ofNd3+ ions. The 4f25d configuration can be reached by directpumping or by multiphotonic excitation, both processes giverise to the UV band emission with structure due to the strongphonon coupling expected for 5d orbital involvement in thetransition. The multiphotonic excitation process is due to threephotons (532 nanometers [nm]) sequential absorptions bymetastable levels of the 4f3 configuration split by crystallinelocal field. The sequential excitation of Nd by the laserexcitation is attributed to the 4I9/2 + 532 nm t 4G7/2 groundstate absorption followed by the 4G7/2 + 532 nm t 2F5/2 and 2F5/2+ 532 nm t 4f25d excited state absorptions. The UV emissionsdue to 4f25d configuration are parity allowed, having lifetimeof 35 nanoseconds (ns) in contrast to UV emissions from 4f3configuration which are induced by two absorption steps andare parity forbidden showing longer lifetime of 8 microseconds(ms) and narrow lines. The polarization effects of the UVemissions were studied and their behaviors are dependent onthe excited state configuration involving or not involving the5d orbital. The allowed UV emission positions were affectedby the host variation more than the ones originated from the4f3 configuration as expected. The electronic energy of the4f25d configuration shifts to lower energy for increasing thecrystal field. 2006 artículo científico 1678-5428 https://www.redalyc.org/articulo.oa?id=81040119 en http://www.redalyc.org/revista.oa?id=810 Exacta application/pdf Universidade Nove de Julho Exacta (Brasil) Num.1 Vol.4 |
| format | Artículo científico |
| id | redalyc_81040119 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universidade Nove de Julho |
| spellingShingle | Study of UV fluorescences induced from 4f3 → 4f2 d multistep absorptions of Nd3+ions in YLiF4 and LuLiF4 crystals André Felipe Henriques Librantz Ingeniería UV transition Ultraviolet radiation Multiphotonic excitation process Study of UV fluorescences induced from 4f3 → 4f2 d multistep absorptions of Nd3+ions in YLiF4 and LuLiF4 crystals André Felipe Henriques Librantz Luiz Vicente Gomes Tarelho Laércio Gomes Izilda Márcia Ranieri Ingeniería UV transition Ultraviolet radiation Multiphotonic excitation process Nd3+ ultraviolet (UV) fluorescence induced by multiphotoniclaser excitations was studied in doped Nd:YLiF4 (YLF) andNd:LuLiF4 (LLF) crystals by using the time resolved spectroscopytechnique. The UV luminescences are due to transitionsbetween the 4f25d and the 4f3 electronic configurations ofNd3+ ions. The 4f25d configuration can be reached by directpumping or by multiphotonic excitation, both processes giverise to the UV band emission with structure due to the strongphonon coupling expected for 5d orbital involvement in thetransition. The multiphotonic excitation process is due to threephotons (532 nanometers [nm]) sequential absorptions bymetastable levels of the 4f3 configuration split by crystallinelocal field. The sequential excitation of Nd by the laserexcitation is attributed to the 4I9/2 + 532 nm t 4G7/2 groundstate absorption followed by the 4G7/2 + 532 nm t 2F5/2 and 2F5/2+ 532 nm t 4f25d excited state absorptions. The UV emissionsdue to 4f25d configuration are parity allowed, having lifetimeof 35 nanoseconds (ns) in contrast to UV emissions from 4f3configuration which are induced by two absorption steps andare parity forbidden showing longer lifetime of 8 microseconds(ms) and narrow lines. The polarization effects of the UVemissions were studied and their behaviors are dependent onthe excited state configuration involving or not involving the5d orbital. The allowed UV emission positions were affectedby the host variation more than the ones originated from the4f3 configuration as expected. The electronic energy of the4f25d configuration shifts to lower energy for increasing thecrystal field. 2006 artículo científico 1678-5428 https://www.redalyc.org/articulo.oa?id=81040119 en http://www.redalyc.org/revista.oa?id=810 Exacta application/pdf Universidade Nove de Julho Exacta (Brasil) Num.1 Vol.4 |
| title | Study of UV fluorescences induced from 4f3 → 4f2 d multistep absorptions of Nd3+ions in YLiF4 and LuLiF4 crystals |
| topic | Ingeniería UV transition Ultraviolet radiation Multiphotonic excitation process |
| url | https://www.redalyc.org/articulo.oa?id=81040119 |