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A green electroluminescent device made from an yttrium complex

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An yttrium complex, tris(1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone) (phenanthroline) yttrium (Y(PMIP)3(Phen)) was synthesized and characterized by photoluminescence and electroluminescence. Experimental data show that the complex has carrier-transporting and emitting properties. Using poly(N-vinylcarbazole) (PVK) as the hole-transporting layer, a bilayer device ITO/PVK(40 nm)/Y(PMIP)3(Phen) (80 nm)/Mg: Ag(200 nm)/Ag(100 nm) exhibited green emission with a luminance of 180 cd/m2 and a peak power efficiency of 0.01 lm/w. Using tris(8-hydroxyquinoline) aluminum (ALQ) as the electron transporting layer, the luminance was enhanced up to 460 cd/m2 at 17 V.


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