| http://www.w3.org/ns/prov#value | - It is preferred to use, as the dopant material of the luminescent material, a material represented by the formula [2]: wherein Ar2 to Ar4 are each a substituted or unsubstituted aromatic group with 6 to 50 nucleus carbon atoms, or a substituted or unsubstituted styryl group; and p is an integer of 1 to 4; provided that Ar3s, as well as Ar4s, may be the same as or different from each other when p i
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