2.  Introduction  Literature Review  Motivation  Experimental  Results and Discussion  Conclusion  Future work  References 2

3.  Introduction  Literature Review  Motivation  Experimental  Results and Discussion  Conclusion  Future work  References 3

4. 4

5. 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.

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

7. 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 B 2 O 3, NaF 2 and extensive ball milling. With increase of temperature, YAG was formed gradually and two transition phases, YAP(YAlO 3 ) and YAM (YAl 4 O 9 ) were reduced. 7

8. 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.

9.  Introduction  Literature Review  Motivation  Experimental  Results and Discussion  Conclusion  Future work  References 9

10. 10

11. 11

12. Calcined at 1000 ℃ for different holding time YAG:Ce powder Dry

13.  Introduction  Literature Review  Motivation  Experimental  Results and Discussion  Conclusion  Future work  References 13

14. 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

15. 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

16.  Introduction  Literature Review  Motivation  Experimental  Results and Discussion  Conclusion  Future work  References 16

17. 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

18. 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

19. 19 The properties of YAG:Ce powders synthesized at different calcined temperature will be investigated and characterized by SEM, XRD and PL.

20. [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

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