1. K.A. Belmore, R.A. Vanderpool, J.C. Tsai, M.A. Khan, K.M. Nicholas, J. Am. Chem. Soc. 110, 2004 (1988)
2. K.K.-W. Lo, C.-K. Chung, T.K.-M. Lee, L.-K. Lui, K.H.-K. Tsang, N. Zhu, Inorg. Chem. 42, 6886 (2003)
3. M.C. DeRosa, D.J. Hodgson, G.D. Enright, B. Dawson, C.E.B. Evans, R.J. Crutchley, J. Am. Chem. Soc. 126, 7619–7626 (2004)
4. H. Yersin (ed.), Highly Efficient OLEDs with Phosphorescent Materials (Wiley VCH, Berlin, 2007)
5. D. Tanaka, H. Sasabe, Y.-J. Li, S.-J. Su, T. Takeda, J. Kido, Jpn. J. Appl. Phys. 46, L10–L12 (2007)