More specifically, the present invention relates to carbene {TAIL ~ metal complexes} incorporated into {HEAD ~ OLEDs} 
More specifically , the present invention relates to carbene { TAIL ~ metal complexes } incorporated into { HEAD ~ OLEDs }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD