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