| 光谱学与光谱分析 |
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| Luminescent Properties of Eu3+ Doped Layered Perovskite Structure M2TiO4(M=Ca,Sr,Ba) Red-Emitting Phosphors |
| LU Zhou1, ZHANG Le1, XU Nai-cen2, WANG Li-xi1, ZHANG Qi-tu1* |
1. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
2. Ministry of Land and Resources of Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China |
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Abstract Series of Eu3+ doped layered perovskite structure M2TiO4∶Eu3+ (M=Ca,Sr,Ba) red phosphors were prepared by the high-temperature solid state reaction method. Their phase compositions and photoluminescence properties were investigated by XRD, UV-Vis DRS and fluorescence spectra. The results indicated that pure Sr2TiO4 and Ba2TiO4 powers could be prepared under 1 100 ℃ for 2 hours, but Ca2TiO4 powers could not be synthesized even raising the calcination temperature and lengthening the calcination time. Ba2TiO4∶Eu3+ phosphor emitted 594 nm(5D0→7F1) and 615 nm(5D0→7F2) orange-red light under the excitation of 395 nm. Sr2TiO4∶Eu3+ phosphor gave a unusual and strong orange-red emission of 578 nm(5D0→7F0) and 626 nm(5D0→7F2) under the excitation of near ultraviolet or blue light, resulting in the better color purity and higher luminescent intensity. In addition, this phosphor had the highest luminous efficiency when excited by the charge migration excitation at 363 nm and it had the great potential to be a red phosphor for N-UV LED and blue light chip.
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Received: 2012-05-22
Accepted: 2012-09-04
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Corresponding Authors:
ZHANG Qi-tu
E-mail: zhqt@njut.edu.cn
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