the Natural Science Foundation of Fujian Province of China (No.2011J01359);the Project of Science and Technology Research of the Education Department of Fujian Province of China (No.JK2011043);the Project of Science and Technology Research of Quanzhou in Fujian Provice of China (No.2011G16)
A hole-blocking layer (HBL) of 4,7-diphenyl-1,10-phenanthroline (BPhen) is incorporated between the emitting layer (EML) and the electron transport layer (ETL) for a tris-(8-hydroxyqunoline)aluminum based organic ligh...