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
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
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.
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.
[1] Chen D and Xu R 1998 Mater. Res. Bull. 33 409 [2] Li K et al 2006 Nanotechnology 17 4863 [3] Hwang D et al 2003 J. Phys. Chem. B 107 4963 [4] Joseph L et al 2008 Spectrochim. Acta A 71 1281 [5] Diallo P T et al 1998 J. Alloys Compd. 275--277 307 [6] Diallo P T et al 2002 J. Alloys Compd. 341 139 [7] Park J K et al 2001 J. Mater. Res . 16 2568 [8] Pinel E et al 2004 J. Alloys Compd . 374 165 [9] Liu Y, Lei B and Shi C 2005 Chem. Mater. 17 2108 [10] Trojan-Piegza J et al 2008 Chem. Mater. 20 2252 [11] Lei B et al 2007 J. Electrochem. Soc. 154 H623 [12] Cui C et al 2009 Acta Phys. Sin. 58 3565 (in Chinese) [13] Liu B et al 2005 Chin. Phys. Lett. 22 1256 [14] Kang J and Liu Y 2006 Chin. Phys. Lett. 23 204 [15] Gasperin M 1975 Acta Crystallogr. B 31 2129 [16] Prasadarao A V et al 1991 Mater. Lett . 12 306 [17] Popp R C 1991 Luminescence and the Solid State (Amsterdam: Elsevier) p 291 [18] Qiu J et al 1999 J. Non-Cryst. Solids 244 185 [19] Clabau F et al 2005 Chem. Mater . 17 3904 [20] Jia D and Yen W M 2003 J. Electrochem. Soc. 150 H61 [21] Hosono H et al 1998 J. Phys.: Condens. Matter. 10 9541 [22] Kinoshita T et al 1999 J. Appl. Phys . 86 3729 [23] Iwasaki M et al 2003 Sci. Tech. Adv. Mater. 4 137
2010, Vol. 27 
