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