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 electrode or a hole;
• and
• a dopant material represented by Formula 1:
• wherein each of R1 to R4 is selected from the group consisting of hydrogen atom (H) and non-substituted C1 to C6 alkyl, and at least one of R1 to R3 is non-substituted C1 to C6 alkyl,
• wherein two of R5 to R7 are selected from the group consisting of halogen atom and non-substituted C1 to C6 alkyl, provided at least one is halogen, and one of R5 to R7 is hydrogen atom, 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.