{HEAD ~ An electroluminescent device} which comprises an organic luminescent layer containing {TAIL ~ the organometallic luminescent material} comprising a compound of formula : 
{ HEAD ~ An electroluminescent device } which comprises an organic luminescent layer containing { TAIL ~ the organometallic luminescent material } comprising a compound of formula :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH