Triplet exciton energy transfer in polyfluorene doped with heavy metal complexes studied using photoluminescence and photoinduced absorption

H. H. Liao,1,2 H. F. Meng,1,* S. F. Horng,2 W. S. Lee,1 J. M. Yang,2 C. C. Liu,2 J. T. Shy,3 F. C. Chen,4 and C. S. Hsu5 1Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan, Republic of China 2Department of Electric Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China 3Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan, Republic of China 4Institute of Display, National Chiao Tung University, Hsinchu 300, Taiwan, Republic of China 5Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan, Republic of China Received 12 April 2006; revised manuscript received 24 October 2006; published 15 December 2006