Reporter：Li-Ping Liu
Adviser：Ming-Shyong Tsai and Ming-Cing Syu
Date：2011/10/5








Introduction
Literature Review
Motivation
Experimental
Results and Discussion
Conclusion
Future work
References
2

Introduction

Literature Review
Motivation
Experimental
Results and Discussion
Conclusion
Future work
References






3
4

Several methods to prepare YAG:Ce powder, such
as:





Co-precipitation method
Sol-gel method
Solid-state method
Solvothermal method
It is necessary that the preparation of YAG:Ce
powers by above methods were carries out under
high temperature or long holding time.
5








Introduction
Literature Review
Motivation
Experimental
Results and Discussion
Conclusion
Future work
References

To obtain pure and small YAG:Ce phosphors,
traditional solid-state reaction method was necessary
to synthesize these powers by high temperature
treatment (>1600 °C) for unless 5hr under the flux,
such as B2O3, NaF2 and extensive ball milling.

With increase of temperature, YAG was formed
gradually and two transition phases, YAP(YAlO3) and
YAM (YAl4O9) were reduced.
7

In our study, we uesd a facile, novel solid-state
reaction method to synthesizeYAG:Ce powder under
low temperature for short hoding time.

Our study proved that the method was easy and fast
to synthesize pure YAG:Ce power .

Introduction
Literature Review
Motivation

Experimental






Results and Discussion
Conclusion
Future work
References
9





10
Deionized water
Y2O3 (NH4)2Ce(NO3)6
AlOOH
Deionized water
pH adjustment
pH adjustment
11
Dry
Calcined at 1000℃ for different holding time
YAG:Ce powder








Introduction
Literature Review
Motivation
Experimental
Results and Discussion
Conclusion
Future work
References
13
Fig. 2. SEM images of the YAG:Ce powders prepared at (a) pH=3(b) pH=2 (c)
pH=1(d) pH=0.1. All samples were prepared at 1000℃ for 1hr.
14
Fig. 5. SEM images of the YAG:Ce powders prepared at prepared at calcined 1000℃ for
(a) 30min (b) 60min. All samples were prepared at pH=0.1.
15

Introduction
Literature Review
Motivation
Experimental
Results and Discussion

Conclusion

Future work
References





16

This study successfully synthesis of pure YAG:Ce
phosphors at low temperature and short time by novel
solid-state reaction method.

The XRD results show that YAG:Ce powders under
pH=0.1 and 1000℃ for 30 min was pure YAG phase.
17

The SEM images show that the particles size of
YAG:Ce powers was uniform (about 100 nm) and
aggregates was observed.

From PL spectrum. YAG:Ce prepared under pH=0.1
and 1000℃ for 60 min showed better intensity of
Emission than others.
18

The properties of YAG:Ce powders synthesized at
different calcined temperature will be investigated and
characterized by SEM, XRD and PL.
19
[1] C.C. Yang, C.M. Lin, Y.J. Chen, Applied Physics Letters 90 (2007).
[2] W. Ding, J. Wang, M. Zhang, Chemical Physics Letters 435 (2007) 4-6.
[3] N. Narrndarn, Y. Gu, J.P. Freyssinier, H. Yu, Journal of Crystal Growth 268 (2008).
[4] Z. Yang, X. Li, Y. Yang, X. Li, Journal of Luminescence 122-123 (2007).
[5] Y. Pan, M. Wu, Q. Su, Materials Science and Engineering B 106 (2004).
[6] M.S. Tsai, W.C. Fu, G.M. Liu, Journal of Alloys and Compounds 440 (2007)309-314.
[7] Y.C. Kang, I.W. Lenggoro, S.B. Park, K. Okuyama, Mater. Res. Bull. (2000) 789-798.
[8] Z. Huang, X. Sun, Z. Xiu, S. Chan, C.T. Tsai, Mater. Lett. 58 (2004) 2137-2142.
[9] F. Yuan, H. Materials Science and Engineering B 107 (2004) 14-18.
[10] S. Ray, L. Wang, W. Sigmund, F. Aldinger, Mater. Lett. 39 (1999) 138-141.
[11] N. Jia, X. Zhang, W. He, W.J. Hu, X. Meng, Y. Du, J. Jiang, Y. Du, Journal of Alloys
and Compounds 509 (2011) 1848-1853.
[12] G.M. Liu, M.S. Tsai, C.H. Chen, C.H. Yang, Journal of The Electrochemical Society 154
(2007) J11-J14.
[13] M.S. Tsai, W.C. Fu, W.C. Wu, C.H. Chen, C.H. Yang, Journal of Alloys and
Compounds 455 (2008) 461-464.
[14] S. Xu, L. Sun, Y. Zhang, H. Ju, S. Zhao, D. Deng, H. Wang, B. Wang, Journal of Rare
Earths 27 (2009) 327-329.
20
21