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