Novel nanosized Y2WO6：Eu3＋ phosphors were synthesized via a co-precipitation reaction. The crystal structure of Y2WO6：Eu3＋sample was monoclinic phase characterized by using X-ray diffraction （XRD）. The particle ...Novel nanosized Y2WO6：Eu3＋ phosphors were synthesized via a co-precipitation reaction. The crystal structure of Y2WO6：Eu3＋sample was monoclinic phase characterized by using X-ray diffraction （XRD）. The particle size was about 80 nm ob-served by field emission scanning electron microscopy （FE-SEM）. The photoluminescence properties of Y2WO6：Eu3＋nanophos-phors were studied. The results indicated that Eu3＋ 5D0→7F2 red luminescence at 611 nm could be effectively excited by 394 nm near-UV light and 465 nm blue light in Y2WO6 host. The luminescence intensity was the strongest while the Eu3＋doping concentra-tion was 20%. And the chromaticity coordinates of this concentration is （0.651, 0.348）. The energy transfer type between the Eu3＋was determined to be the exchange interaction and the critical energy transfer distance （Dc） was calculated to be about 0.81 ang-strom. The J-O parameters, quantum efficiencies of Eu3＋ 5D0 energy level and Huang-Rhys factor of Y2WO6：Eu3＋nanophosphors were calculated. The calculated values indicated that Y2WO6：Eu3＋had a high capacity for activators and the electron-phonon cou-pling was weak. Therefore, the Y2WO6：Eu3＋nanophosphor is a nice red luminescent material and it may have a potential applica-tion in white LED.展开更多
基金Project supported by National Natural Science Foundation of China(51002041)Foundation for Young Key Scholars of Higher Education Institution of Heilongjiang Province(1252G032)Foundation for Young Key Scholars of Harbin Normal University(11KXQ-06)for financial support
文摘Novel nanosized Y2WO6：Eu3＋ phosphors were synthesized via a co-precipitation reaction. The crystal structure of Y2WO6：Eu3＋sample was monoclinic phase characterized by using X-ray diffraction （XRD）. The particle size was about 80 nm ob-served by field emission scanning electron microscopy （FE-SEM）. The photoluminescence properties of Y2WO6：Eu3＋nanophos-phors were studied. The results indicated that Eu3＋ 5D0→7F2 red luminescence at 611 nm could be effectively excited by 394 nm near-UV light and 465 nm blue light in Y2WO6 host. The luminescence intensity was the strongest while the Eu3＋doping concentra-tion was 20%. And the chromaticity coordinates of this concentration is （0.651, 0.348）. The energy transfer type between the Eu3＋was determined to be the exchange interaction and the critical energy transfer distance （Dc） was calculated to be about 0.81 ang-strom. The J-O parameters, quantum efficiencies of Eu3＋ 5D0 energy level and Huang-Rhys factor of Y2WO6：Eu3＋nanophosphors were calculated. The calculated values indicated that Y2WO6：Eu3＋had a high capacity for activators and the electron-phonon cou-pling was weak. Therefore, the Y2WO6：Eu3＋nanophosphor is a nice red luminescent material and it may have a potential applica-tion in white LED.
