1. R Ye, Z Cui, Y Hua, D Deng, S Zhao, C Li and S Xu J. Non-Cryst. Solids 357 22 (2011)
2. W J Yang and T M Chen Appl. Phys. Lett. 88 101 (2006)
3. J S Kim, P E Jeon and Y H Park, Appl. Phys. Lett. 85 36 (2004)
4. T Stefan, P Peter, R Gundula, T Walter, K Wolfgang and S Detlef (2001) Light source comprising a light-emitting element. US Patent No. 6809347
5. J S Kim, Y H Park, J C Choi and H L Park J. Electrochem. Soc. 152 135(2005)