| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Long-Lasting Phosphorescence Properties of Pyrochlore La2Ti2O7:Pr3+ Phosphor |
CHU Ming-Hui1,2, JIANG Da-Peng1, ZHAO Cheng-Jiu1, LI Bin1 |
| 1Key Laboratory of Excited State Processes, ChangchunInstitute of Optics Fine Mechanics and Physics, Chinese Academy ofSciences, Changchun 1300332Graduate School of the Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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CHU Ming-Hui, JIANG Da-Peng, ZHAO Cheng-Jiu et al 2010 Chin. Phys. Lett. 27 047203 |
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Abstract The La2Ti2O7:Pr3+, which emits red color luminescence upon UV light excitation, is prepared by the conventional high-temperature solid-state method and its luminescent properties are systematically investigated. X-ray diffraction, photoluminescence, afterglow emission spectra and long-lasting phosphorescence (LLP) decay curves are used to characterize this phosphor. After irradiation by a 290-nm UV light for 3 min, the Pr3+-doped La2Ti2O7 phosphor emits intense red emitting afterglow from the 1D2→3H4 transitions, and its afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source. The afterglow decay curve of the Pr3+-doped La2Ti2O7 phosphor contains a fast decay component and another slow decay one. The possible mechanism of this red light emitting LLP phosphor is also discussed based on the experimental results.
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| Keywords:
72.20.Jv
78.55.Hx
78.60.Lc
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Received: 05 January 2010
Published: 27 March 2010
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| PACS: |
72.20.Jv
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(Charge carriers: generation, recombination, lifetime, and trapping)
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78.55.Hx
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(Other solid inorganic materials)
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78.60.Lc
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(Optically stimulated luminescence)
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