By courtesy of:
Brian W. D’Andrade, Russell J. Holmes, and Stephen R. Forrest*
Adv. Mater. 2004, 16, 624Â
and a recent paper:
Mixing of Excimer and Exciplex Emission: A New Way to Improve White Light Emitting Organic Electrophosphorescent Diodes
Jan Kalinowski,* Massimo Cocchi,* Dalia Virgili, Valeria Fattori, and J. A. Gareth Williams*Â
 Adv. Mater. 2007, 19, 4000