Issue

Vol. 25 No. 11 (2013): Vol 25 Issue 11

Copyright (c) 2013 AJC

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Preparation of Tetra-Tungstate Red Phosphors and Corresponding White Light-Emitting Diodes

https://doi.org/10.14233/ajchem.2013.14206
Qihua Zeng
College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, P.R. China
Hongbin Liang
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, P.R. China
Menglian Gong
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, P.R. China

Corresponding Author(s) : Qihua Zeng

qihuazeng@139.com

Asian Journal of Chemistry, Vol. 25 No. 11 (2013): Vol 25 Issue 11

Abstract

Eu3+-activated tungstate phosphors, Ca9Gd2-xEuxW4O24 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0), were prepared by the conventional solid-state reaction method. A systematic and exhaustive study for their photoluminescent properties was made. The tungstate phosphors show intensely red emission under 395 and 465 nm light excitation and good Commission International de l'Eclairage (CIE) chromaticity coordinates, therefore can get high colour purity of red emission. Excellent thermal stability for luminescence can also be observed for the tungstate phosphors. Bright red light-emitting diodes (LEDs) and white light-emitting diodes (WLEDs) were fabricated with Ca9Eu2W4O24 phosphor on ca. 395 nm-emitting InGaN chips and about 460 nm blue-emitting InGaN chips, respectively. The good performances of the LEDs demonstrate that the tungstate phosphor is suitable for application of near-UV (NUV) and blue InGaN-based WLEDs.

Keywords

Rare earth Tungstate Phosphor Light-emitting diode
Zeng, Q., Liang, H., & Gong, M. (2013). Preparation of Tetra-Tungstate Red Phosphors and Corresponding White Light-Emitting Diodes. Asian Journal of Chemistry, 25(11), 5971–5974. https://doi.org/10.14233/ajchem.2013.14206
Download Citation
Endnote/Zotero/Mendeley (RIS)
BibTeX
References
  1. T. Taguchi, J. Light Visual Environ., 27, 131 (2003).
  2. R. Asakura, T. Isobe, K. Kurokawa, H. Aizawa and M. Ohkubo, Anal. Bioanal. Chem., 386, 1641 (2006).
  3. H.S. Jang, W.B. Im, D.C. Lee, D.Y. Jeon and S.S. Kim, J. Luminescence, 126, 371 (2007).
  4. S. Neeraj, N. Kijima and A.K. Cheetham, Chem. Phys. Lett., 387, 2 (2004).
  5. J.K. Sheu, S.J. Chang, C.H. Kuo, Y.K. Su, L.W. Wu, Y.C. Lin, W.C. Lai, J.M. Tsai, G.C. Chi and R.K. Wu, IEEE Photonics Technol. Lett., 15, 18 (2003).
  6. C.L. Lo, J.G. Duh, B.S. Chiou, C.-C. Peng and L.J. Ozawa, Mater. Chem. Phys., 71, 179 (2001).
  7. L. Qi, B.I. Lee, X. Gu, M. Grujicic, W.D. Samuels and G.J. Exarhos, Appl. Phys. Lett., 83, 4945 (2003).
  8. J. Wang, X. Jing, C. Yan, J. Lin and F. Liao, J. Luminescence, 121, 57 (2006).
  9. V. Sivakumar and U.V. Varadaraju, J. Electrochem. Soc., 152, H168 (2005).
  10. J. Pan, L.-Z. Yau, L.-G. Chen, G.-W. Zhao, G.-E. Zhou and C.-X. Guo, J. Luminescence, 40-41, 856 (1988).
  11. Z. Wang, H. Liang, J. Wang, M. Gong and Q. Su, Appl. Phys. Lett., 89, 071921 (2006).
  12. Q. Zeng, H. Liang, M. Gong and Q. Su, J. Electrochem. Soc., 155, H730 (2008).
  13. Q. Zeng, P. He, M. Pang, H. Liang, M. Gong and Q. Su, Solid State Commun., 149, 880 (2009).
  14. K.R. Reddy, K. Annapurna and S. Buddhudu, Mater. Res. Bull., 31, 1355 (1996).
  15. L. Mu-Jen, US Patent 20050161690 (2005).
  16. A. Ellens, Int. Pat. Appl. WO2001093342 (2001).
Read More
Author biographies is not available.
Download
PDF
Statistic
Read Counter : 0 Download : 0