L4
Y. Liu et al. / Journal of Alloys and Compounds 485 (2009) L1–L4
as ultrasonic irradiation time and temperature on the formation
and growth of CeF3 nanocrystals were investigated. Results indi-
cate that a proper time of ultrasonic irradiation of Ce(NO3)3·6H2O
in the presence of KBF4 and PVP under vigorous stirring at a rel-
atively lower temperature (e.g., 100 min) favored the formation of
well-defined disk-like CeF3 nanocrystals. The PL intensity of the
CeF3 nanocrystals was highly related to the size and shape. The
CeF3 nanocrystals prepared at a relatively higher temperature (e.g.,
65 ◦C or 70 ◦C) registered a very small PL intensity, which might
be attributed to the luminescence quenching of the samples with
more surface defects.
Acknowledgments
The financial support from National Natural Science Founda-
tion of China (grant No. 20671029), Henan Provincial Outstanding
Youth Fund of China (grant No. 0612002900) and the Ministry of
Science and Technology of China (project of “973” plan, grant No.
2007CB607606) is gratefully acknowledged.
Fig. 5. Emission spectra of the CeF3 nanocrystals obtained with different ultrasonic
time. (a) 80 min; (b) 100 min; (c) 120 min; (d) 140 min.
References
[1] Q.H. Wang, A.A. Setlur, J.M. Lauerhaas, J.Y. Dai, E.W. Seelig, R.P.H. Chang, Appl.
Phys. Lett. 72 (1998) 2912.
[2] C. Feldmann, T. Jüstel, C.R. Ronda, P.J. Schmidt, Adv. Funct. Mater. 13 (2003) 511.
[3] J.F. Liu, Q.H. Yao, Y.D. Li, Appl. Phys. Lett. 88 (2006) 173119.
[4] M. Bruchez, M. Moronne, P. Gin, S. Weiss, A.P. Alivisatos, Science 281 (1998)
2013.
[5] W.C.W. Chan, S.M. Nie, Science 281 (1998) 2016.
[6] L. Wang, C.Y. Yang, W.H. Tan, Nano Lett. 5 (2005) 37.
[7] J. Zhang, C.M. Shade, D.A. Chengelis, S. Petoud, J. Am. Chem. Soc. 129 (2007)
14834.
[8] F. Wang, X. Liu, J. Am. Chem. Soc. 130 (2008) 5642.
[9] R.X. Yan, Y.D. Li, Adv. Funct. Mater. 15 (2005) 763.
[10] F. Zhang, Y. Wan, T. Yu, F.Q. Zhang, Y.F. Shi, S.H. Xie, Y.G. Li, L. Xu, B. Tu, D.Y. Zhao,
Angew. Chem. Int. Ed. 46 (2007) 7976.
[11] K. Wei, C.X. Guo, J. Deng, C.S. Shi, J. Electron Spectrosc. Rel. Phenom. 79 (1996)
83.
[12] C. Hoff, H.D. Wiemhöfer, O. Glumov, I.V. Murin, Solid State Ionics 101–103 (1997)
445.
[13] N. Lei, X.Q. Feng, G.Q. Hu, Z.W. Yin, S. Yuan, S.H. Xue, X.Y. Hou, Chin. Phys. Lett.
15 (1998) 603.
[14] A.D. Cárcer, P. Herrero, A.R. Landa-Cánovas, B. Sobolev, Appl. Phys. Lett. 87
(2005) 053105–53111.
[15] X. Wang, J. Zhuang, Q. Peng, Y.D. Li, Inorg. Chem. 45 (2006) 6661.
[16] S.Q. Qiu, J.X. Dong, G.X. Chen, Powder Technol. 113 (2000) 9.
[17] L.B. Wang, M. Zhang, X.B. Wang, W.M. Liu, Mater. Res. Bull. 43 (2008) 2220.
[18] Y.V. Orlovskii, T.T. Basiev, E.O. Orlovskaya, Y.S. Privis, V.V. Fedorov, S.B. Mirov, J.
Luminesc. 101 (2003) 211.
Fig. 6. Emission spectra spectrum of the CeF3 nanocrystals by ultrasonic irradiated
for 100 min at different temperature. (a) 55 ◦C; (b) 65 ◦C; (c) 70 ◦C.
[19] K. Shimamura, E.G. Villora, S. Nakakita, M. Nikl, N. Ichinose, J. Cryst. Growth 264
(2004) 208.
[20] E.G. Víllora, K. Shimamura, S. Nakakita, M. Nikl, N. Ichinose, Nucl. Instrum. Meth.
Phys. Res. Sect. A 537 (2005) 139.
[21] G. Dantelle, M. Mortier, D. Vivien, G. Patriarche, Chem. Mater. 17 (2005) 2216.
[22] R. Novotny, R. Beck, W. DÖring, V. Hejny, M. Hoek, A. Hofstaetter, V. Metaga, K.
Römer, Nucl. Instrum. Meth. Phys. Res. Sect. A 486 (2002) 131.
[23] H. Guo, Appl. Phys. B 84 (2006) 365.
[24] D.Y. Kong, Z.L. Wang, C.K. Lin, Z.W. Quan, Y.Y. Li, C.X. Li, J. Lin, Nanotechnology
18 (2007) 075601.
[25] L. Zhu, Q. Li, X.D. Liu, J.Y. Li, Y.F. Zhang, J. Meng, X.Q. Cao, J. Phys. Chem. C 111
(2007) 5898.
[26] X. Sun, Y.W. Zhang, Y.P. Du, Z.G. Yan, R. Si, L.P. You, C.H. Yan, Chem. Eur. J. 13
(2007) 2320.
[27] C.X. Li, X.M. Liu, P.P. Yang, C.M. Zhang, H.Z. Lian, J. Lin, J. Phys. Chem. C 112 (2008)
2904.
[28] Z.L. Wang, Z.W. Quan, P.Y. Jia, C.K. Lin, Y. Luo, Y. Chen, J. Fang, W. Zhou, C.J.
O’Connor, J. Lin, Chem. Mater. 18 (2006) 2030.
sonic irradiation time of 140 min, irregular CeF3 phosphor with
more defects was obtained, corresponding to a further reduced PL
intensity.
Fig. 6 shows the fluorescence intensity of CeF3 nanocrystals with
the ultrasound irradiation of 100 min at different temperatures.
It can be seen that CeF3 phosphor was hardly formed when the
reaction temperature was increased from 55 ◦C to 65 ◦C or 70 ◦C,
possibly corresponding to luminescence quenching. In other words,
the sample prepared at a high temperature would have irregular
shape and possess more defects, leading to luminescence quench-
ing and hence significantly reduced luminescence intensity of the
irregular CeF3 nanocrystals as compared with the disk-like samples.
[29] Z.Y. Wang, Z.B. Zhao, J.S. Qiu, Chem. Mater. 19 (2007) 3364.
[30] L. Ma, W.X. Chen, Z.D. Xu, Mater. Lett. 62 (2008) 2596.
[31] K.S. Suslick, Science 247 (1990) 1439.
[32] W.B. Bu, H.R. Chen, Z.L. Hua, Z.C. Liu, W.M. Huang, L.X. Zhang, J.L. Shi, Appl. Phys.
Lett. 85 (2004) 4307.
4. Conclusions
Disk-like CeF3 nanostructures were successfully prepared via an
ultrasonic-assisted process. The effects of reaction conditions such