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In this paper,we demonstrate that controlled dopant-concentration is an essential issue for charge carriers transporting in red Phosphorescent Organic Light-Emitting Device(PHOLED).Carriers transport via dopant molecules in the emitting layer with a single host,however,via both dopant and host molecules when their energy levels are well aligned.Conditions for reduced driving-voltage and enhanced efficiency of red PHOLED are obtained by employing a mixed host structure.A pure red PHOLED with color coordinates of(0.67,0.33) has been realized by using only 4 wt% dopant,The device achieves 100 cd/cm2 at 2.9 V,with corresponding power efficiency of 9.3 lm/W and external quantum efficiency of 14.3%.
In this paper, we demonstrate that controlled dopant-concentration is an essential issue for charge carriers transporting in red Phosphorescent Organic Light-Emitting Device (PHOLED). Carriers transport via dopant molecules in the emitting layer with a single host, however, via both dopant and host molecules when their energy levels are well aligned. Conditions for reduced driving-voltage and enhanced efficiency of red PHOLED are obtained employing employing mixed host structure. A pure red PHOLED with color coordinates of (0.67,0.33) has been realized by using only 4 wt% dopant, the device achieves 100 cd / cm2 at 2.9 V with corresponding power efficiency of 9.3 lm / W and external quantum efficiency of 14.3%.