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