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