Long-Lived Exciplex Formation and Delayed Exciton Emission in Bulk Heterojunction Blends of Silole Derivative and Polyfluorene Copolymer: The Role of Morphology on Exciplex Formation and Charge Separation - Benson-Smith,JJ; Wilson,J; Dyer-Smith,C; Mouri,K; Yamaguchi,S; Murata,H; Nelson,J (JOURNAL OF PHYSICAL CHEMISTRY B, 2009)