An organic light emitting device having {HEAD ~ an anode}, a cathode and {TAIL ~ an organic layer} between the anode and the cathode is provided 
An organic light emitting device having { HEAD ~ an anode } , a cathode and { TAIL ~ an organic layer } between the anode and the cathode is provided
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH