Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors
Single-phased Sm3+ doped lanthanum calcium borate (SmxLa2−xCaB10O19, SLCB, x=0.06) polycrystalline red phosphor was prepared by solid-state reaction method. The phosphor has two main excitation peaks located at 398.5 nm and 469.0 nm, which are nicely in accordance with the emitting wavelengths of co...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2014/819057 |
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| author | H. H. Xiong C. Zhu X. Zhao Z. Q. Wang H. Lin |
| author_facet | H. H. Xiong C. Zhu X. Zhao Z. Q. Wang H. Lin |
| author_sort | H. H. Xiong |
| collection | DOAJ |
| description | Single-phased Sm3+ doped lanthanum calcium borate (SmxLa2−xCaB10O19, SLCB, x=0.06) polycrystalline red phosphor was prepared by solid-state reaction method. The phosphor has two main excitation peaks located at 398.5 nm and 469.0 nm, which are nicely in accordance with the emitting wavelengths of commercial near-UV and blue light emitting diode chips. Under the excitation of 398.0 nm, the dominant red emission of Sm3+ in SLCB phosphor is centered at 598.0 nm corresponding to the transition of 4G5/2 → 6H7/2. The Eu3+ fluorescence in the red spectral region is applied as a spectroscopic probe to reveal the local site symmetry in the host lattice and, hence, Judd-Ofelt parameters Ωt (t=2, 4) of Eu3+ in the phosphor matrix are derived to be 3.62×10-20 and 1.97×10-20 cm2, indicating a high asymmetrical and strong covalent environment around rare earth luminescence centers. Herein, the red phosphors are promising good candidates employed in white light emitting diodes (LEDs) illumination. |
| format | Article |
| id | doaj-art-cea853bb1f59494d883c4b3d38c06cb4 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-cea853bb1f59494d883c4b3d38c06cb42025-02-03T01:12:29ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422014-01-01201410.1155/2014/819057819057Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red PhosphorsH. H. Xiong0C. Zhu1X. Zhao2Z. Q. Wang3H. Lin4School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, ChinaSchool of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, ChinaSchool of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, ChinaSchool of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, ChinaSchool of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, ChinaSingle-phased Sm3+ doped lanthanum calcium borate (SmxLa2−xCaB10O19, SLCB, x=0.06) polycrystalline red phosphor was prepared by solid-state reaction method. The phosphor has two main excitation peaks located at 398.5 nm and 469.0 nm, which are nicely in accordance with the emitting wavelengths of commercial near-UV and blue light emitting diode chips. Under the excitation of 398.0 nm, the dominant red emission of Sm3+ in SLCB phosphor is centered at 598.0 nm corresponding to the transition of 4G5/2 → 6H7/2. The Eu3+ fluorescence in the red spectral region is applied as a spectroscopic probe to reveal the local site symmetry in the host lattice and, hence, Judd-Ofelt parameters Ωt (t=2, 4) of Eu3+ in the phosphor matrix are derived to be 3.62×10-20 and 1.97×10-20 cm2, indicating a high asymmetrical and strong covalent environment around rare earth luminescence centers. Herein, the red phosphors are promising good candidates employed in white light emitting diodes (LEDs) illumination.http://dx.doi.org/10.1155/2014/819057 |
| spellingShingle | H. H. Xiong C. Zhu X. Zhao Z. Q. Wang H. Lin Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors Advances in Materials Science and Engineering |
| title | Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors |
| title_full | Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors |
| title_fullStr | Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors |
| title_full_unstemmed | Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors |
| title_short | Rare Earth Doped Lanthanum Calcium Borate Polycrystalline Red Phosphors |
| title_sort | rare earth doped lanthanum calcium borate polycrystalline red phosphors |
| url | http://dx.doi.org/10.1155/2014/819057 |
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