RED PHOSPHORESCENE COMPOUNDS AND ORGANIC ELECTROLUMINESCENCE DEVICES USING THE SAME

摘要

A red phosphorescence compound is provided to impart high color purity (CIE color purity X=0.65 or higher), high luminance and improved life span to an organic electroluminescence device using the same compound as a dopant for a light emitting layer. A red phosphorescence compound is represented by the following formula 1, wherein the formula (a) is the formula (b); each of R1, R2, R3 and R4 is selected from the group consisting of H, C1-C4 alkyl and alkoxy groups; and the formula (c) is selected from the group consisting of 2,4-pentanedione, 2,2,6,6-tetramethylheptane-3,5-dione, 1,3-propanedione, 1,3-butanedione, 3,5-heptanedione, 1,1,1-trifluoro-2,4-pentanedione, 1,1,1,5,5,5-hexafluoro-2,4-pentanedione and 2,2-dimethyl-3,5-hexanedione. The red phosphorescence compound is used in a light emitting layer in an amount of 0.5-20 wt% together with a host compound selected from Al, Zn metal complexes and carbazole derivatives.