1. K. Binnemans, in Handbook on the Physics and Chemistry of Rare Earths (PCRE), Ed. by J. A. Gschneider Jr., J.C. G. Bunzli, and V. Pecharsky (Elsevier, Amsterdam, 2005), Vol, 35, Ch. 225.
2. J. B. Sun, S. L. Chen, and P. L. Wang, Chem. J. Chin. U. 3, 385 (1983).
3. C. Adachi, M. A. Baldo, S. R. Forrest, et al., Appl. Phys. Lett. 78, 1622 (2001).
4. J. Kido and Y. Okamoto, Chem. Rev. 102, 2357 (2002).
5. P. P. Sun, J. P. Duan, H. T. Shih, et al., Appl. Phys. Lett. 81, 792 (2002).