Patent ID: 7442797

Claim:
A platinum complex represented by the following general formula (1): (wherein two rings of ring A, ring B, ring C, and ring D represent nitrogen-containing heterocyclic rings which may have substituent(s) and the remaining two rings of them represent aryl rings or hetero aryl rings which may have substituent(s), the ring A and the ring B, or/and the ring A and the ring C, or/and the ring B and the rind D may form condensed rings, and each of the rings and R 1 , R 2 , R 3 , R 4 or R 5 described later may form a condensed ring; two of X 1 , X 2 , X 3 , and X 4 represent nitrogen atoms coordination bonded to a platinum atom and the remaining two of them represent carbon atoms or nitrogen atoms. Q 1 , Q 2 , and Q 3 each represent independently a bivalent atom (group) or single bond providing that Q 1 , Q 2 , and Q 3 do not represent single bond simultaneously, and two of Z 1 , Z 2 , Z 3 , and Z 4 represent coordination bonds, and the remaining two of them represent covalent bonds, oxygen atoms or sulfur atoms).