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

2

Introduction Literature Review Motivation Experimental Results and Discussion Conclusion Future work References

3

4

Solid-state method

Sol-gel method

Co-precipitation method

Solvothermal method

5

Several methods to prepare YAG:Ce powder, such as:

It is necessary that the preparation of YAG:Ce powers by above methods were carries out under high temperature or long holding time.

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

11

Calcined at 1000℃ for different holding time

YAG:Ce powder

Dry

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

17

18

19

The properties of YAG:Ce powders synthesized at different calcined temperature will be investigated and characterized by SEM, XRD and PL.

[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