Growth and 10 K spectroscopy of Nd3+ in NaBi(WO4)2 single crystal
The experimental procedures to grow Nd doped NaBi(WO4)2 single crystals by the Czochralski method and the difficulties or limitations encountered for doping are described. Nd concentrations in the crystal up to 0.3×1020 cm−3 have been produced with optical quality. Polarised optical absorption and p...
| Authors: | , , , |
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| Format: | article |
| Publication Date: | 2001 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/412463 |
| Online Access: | http://hdl.handle.net/10261/412463 https://api.elsevier.com/content/abstract/scopus_id/4243324491 |
| Access Level: | Open access |
| Keyword: | Crystal field Crystal growth Luminescence Optical properties Phosphors |
| Summary: | The experimental procedures to grow Nd doped NaBi(WO4)2 single crystals by the Czochralski method and the difficulties or limitations encountered for doping are described. Nd concentrations in the crystal up to 0.3×1020 cm−3 have been produced with optical quality. Polarised optical absorption and photoluminescence of Nd3+ ion in this host have been studied at 10 K and the relative energies of 90 levels have been determined. An attempt to explain the large observed spectroscopic line-widths has been conducted through crystal field calculations of these levels supposing either a single Nd position with C2 symmetry or two centres both with S4 point symmetry. The latter assumption produces energy differences between both optical centres that can justify the enlargement of lines, but it is not consistent with the OA intensity changes observed in polarised spectra. The coexistence of several sites with statistically modified ordering of the short range Na and Bi cation distribution is suggested to account for this disagreement. |
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