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The bilayer organic light-emitting diode(OLED) with a blue fluorescent lanthanum complex, tris(1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone)-(2,2′-dipyridyl) lanthanum [La(PMIP)3(Bipy)], as a light emitting material and N,N′-diphenyl-N,N′-bis(3-methylpheny