Synthesis and luminescence properties of composite CaAl2O4-2CaAl4O7 : Re3+ (Re3+ = Tb3+, Sm3+) phosphors for application white LEDs

다국어 초록 (Multilingual Abstract)

Composite CaAl2O4-2CaAl4O7 : Re3+ (Re3+ = Tb3+, Sm3+) phosphors were prepared by the SPCS technique, which were studied via XRD, SEM, FT-IR spectra and luminescent spectra. The results show that the crystal lattice structure of them needs slight distortion to improve luminescence properties. They exhibit wider near-UV excitation band around 380 nm. Upon exciting with 380 nm, CaAl2O4-2CaAl4O7 : Tb3+ shows a strong green-light at 548 nm corresponding to a 5D4→7F5 transition of Tb3+ ions,and CaAl2O4-2CaAl4O7 : Sm3+ presents strong red-light at 604 nm corresponding to a 4G5/2→6H7/2 transition of Sm3+ ions. The product fired at 900 oC exhibit high quality crystallinity and with a size of that is approximately 1-3 μm. All the above characteristics of the products are beneficial for phosphors for white LEDs.

참고문헌 (Reference)

1 S. Nakamura, 62 : 2390-2392, 1993

2 Y.C. Kang, 35 : 789-798, 2000

3 S. Aanegola, 10 : 16-, 2003

4 J.K. Sheu, 15 : 18-20, 2003

5 T. Nishida, 82 : 3817-3819, 2003

6 H.S. Jang, 90 : 041906-041908, 2007

7 S. Neeraj, 387 : 2-6, 2004

8 T.R.N. Kutty, 13 : 2271-2278, 2003

9 F.C. Palilla, 115 : 642-644, 1968

10 A.Y. Zhang, 109 : 105-108, 2008

11 M.A. Kale, 128 : 1225-1228, 2008

12 Vijay Singh, 10 : 1525-1532, 2008

13 S. Nakamura, 76 : 8189-8191, 1994

14 Y. Tamure, 32 : 3187-3196, 1993

15 Z.Y. Zhang, 28 : 1737-1741, 2008

16 G.H. Wu, 20 : 560-563, 2000

17 P.S. May, 51 : 249-268, 1992

18 J.Y. Sun, "Solid Luminescent Materials" Chemical Industry Press 240-, 2004

19 R. Reisfeld, "Lasers and Excited States of Rare Earths" Springer 1977