An OLED that satisfies this criterion will have enhanced properties relative to the prior art due to the improved efficiency of {HEAD ~ the light emission} from {TAIL ~ the device} 
from
An OLED that satisfies this criterion will have enhanced properties relative to the prior art due to the improved efficiency of { HEAD ~ the light emission } from { TAIL ~ the device }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL