Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide
Green-emitting Eu-activated powders were produced by a two-stage method consisting of pressure-assisted combustion synthesis and postannealing in ammonia. The as-synthesized powders exhibited a red photoluminescence (PL) peak located at 𝜆=616 nm when excited with 𝜆=395 nm UV. This emission peak corr...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2011/790517 |
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| author | C. E. Rodríguez-García N. Perea-López G. A. Hirata |
| author_facet | C. E. Rodríguez-García N. Perea-López G. A. Hirata |
| author_sort | C. E. Rodríguez-García |
| collection | DOAJ |
| description | Green-emitting Eu-activated powders were produced by a two-stage method consisting of pressure-assisted combustion synthesis and postannealing in ammonia. The as-synthesized powders exhibited a red photoluminescence (PL) peak located at 𝜆=616 nm when excited with 𝜆=395 nm UV. This emission peak corresponds to the 5D0→7F2 transition in Eu3+. After annealing in ammonia, the PL emission changed to an intense broad-band peak centered at 𝜆=500 nm, most likely produced by 4f65d1→4f7 electronic transitions in Eu2+. This green-emitting phosphor has excitation band in the near UV-blue region (𝜆=300–450 nm). X-ray diffraction analysis reveals mainly the orthorhombic EuAlO3 and Al2O3 phases. Transmission electron microscopy observations showed that the grains are formed by faceted nanocrystals (~4 nm) of polygonal shape. The excellent excitation and emission properties make these powders very promising to be used as phosphors in UV solid-state diodes coupled to activate white-emitting lamps. |
| format | Article |
| id | doaj-art-83aa3be7fc9b4b22b380e04437188196 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-83aa3be7fc9b4b22b380e044371881962025-02-03T01:26:07ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422011-01-01201110.1155/2011/790517790517Near UV-Blue Excitable Green-Emitting Nanocrystalline OxideC. E. Rodríguez-García0N. Perea-López1G. A. Hirata2Programa de Posgrado en Física de Materiales, CICESE-UNAM, Carretera Ensenada-Tijuana No. 3918, Zona Playitas, C.P. 22860, Ensenada, BC, MexicoLaboratorio de Investigaciones en Nanociencias y Nanotecnología (LINAN) y División de Materiales Avanzados, IPICYT, Camino a la Presa San José 2055, Lomas 4a. Sección, San Luis Potosí 78216, MexicoCentro de Nanociencias y Nanotecnología Universidad Nacional Autonóma de México, Km 107 Carretera Tijuana-Ensenada, 22800 Ensenada, BC, MexicoGreen-emitting Eu-activated powders were produced by a two-stage method consisting of pressure-assisted combustion synthesis and postannealing in ammonia. The as-synthesized powders exhibited a red photoluminescence (PL) peak located at 𝜆=616 nm when excited with 𝜆=395 nm UV. This emission peak corresponds to the 5D0→7F2 transition in Eu3+. After annealing in ammonia, the PL emission changed to an intense broad-band peak centered at 𝜆=500 nm, most likely produced by 4f65d1→4f7 electronic transitions in Eu2+. This green-emitting phosphor has excitation band in the near UV-blue region (𝜆=300–450 nm). X-ray diffraction analysis reveals mainly the orthorhombic EuAlO3 and Al2O3 phases. Transmission electron microscopy observations showed that the grains are formed by faceted nanocrystals (~4 nm) of polygonal shape. The excellent excitation and emission properties make these powders very promising to be used as phosphors in UV solid-state diodes coupled to activate white-emitting lamps.http://dx.doi.org/10.1155/2011/790517 |
| spellingShingle | C. E. Rodríguez-García N. Perea-López G. A. Hirata Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide Advances in Materials Science and Engineering |
| title | Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide |
| title_full | Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide |
| title_fullStr | Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide |
| title_full_unstemmed | Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide |
| title_short | Near UV-Blue Excitable Green-Emitting Nanocrystalline Oxide |
| title_sort | near uv blue excitable green emitting nanocrystalline oxide |
| url | http://dx.doi.org/10.1155/2011/790517 |
| work_keys_str_mv | AT cerodriguezgarcia nearuvblueexcitablegreenemittingnanocrystallineoxide AT nperealopez nearuvblueexcitablegreenemittingnanocrystallineoxide AT gahirata nearuvblueexcitablegreenemittingnanocrystallineoxide |