Red phosphorescent composition and organic electroluminescent device using the same

An organic electroluminescent device, comprising:

• a first substrate;
• a thin film transistor on the first substrate;
• a second substrate facing the first substrate;
• and
• an organic luminescent diode electrically connected to the thin film transistor and including a first electrode, a second electrode facing the first electrode and an organic emission layer disposed between the first and second electrodes, a red phosphorescent composition of the organic emission layer including:
• a host material being capable of transporting an electron or a hole;
• and
• a dopant material represented by following Formula 1:
• wherein each of R1 to R4 is selected from the group consisting of hydrogen atom (H), C1 to C6 alkyl and C1 to C6 alkoxy, and at least one of R1 to R4 is C1 to C6 alkyl, and wherein each of R5 to R7 is selected from the group consisting of hydrogen, C1 to C6 alkyl and pyrrole, and at least one of R5 to R7 is pyrrole, and wherein each of X and Y is selected from the group consisting of H, non-substituted C1 to C6 alkyl and C1 to C6 alkyl substituted by fluorine, wherein nitrogen of pyrrole in at least one of R5 to R7 is combined with quinoline in the Formula 1.