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Red phosphorescent compounds and organic electroluminescent devices using the same

Disclosed herein are red phosphorescent compounds of the following Formulas 1 to 4:
wherein
 is
    •  R1, R2 and R3 are independently a C1-C4 alkyl group, R4, R5, R6 and R7 are independently selected from hydrogen, C1-C4 alkyl groups and C1-C4 alkoxy groups, and
 is selected from 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;
wherein
 is
  •  R1 and R2 are independently selected from C1-C4 alkyl groups and C1-C4 alkoxy groups, R3, R4, R5 and R6 are independently selected from hydrogen, C1-C4 alkyl groups and C1-C4 alkoxy groups, and
  •  is selected from 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;
    wherein
     is
  •  R1 and R2 are independently selected from C1-C4 alkyl groups and C1-C4 alkoxy groups, R3, R4, R5 and R6 are independently selected from hydrogen, C1-C4 alkyl groups and C1-C4 alkoxy groups, and
  •  is selected from 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; and
    wherein
     is
  •  R1 and R2 are independently selected from C1-C4 alkyl groups and C1-C4 alkoxy groups, R3, R4, R5 and R6 are independently selected from hydrogen, C1-C4 alkyl groups and C1-C4 alkoxy groups, and  is selected from 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. Further disclosed herein is an organic electroluminescent (EL) device comprising an anode, a hole injecting layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injecting layer, and a cathode laminated in this order wherein one of the red phosphorescent compounds is used as a dopant of the light-emitting layer.
  • Owner:LG DISPLAY CO LTD

    Organic electroluminescent device and display device

    The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device comprises an organic luminescent layer; the organic luminescent layer comprisesa main body material, a sensitizing agent material and a resonance thermally activated delayed fluorescence (TADF) material; the main body material is a broad-band gap material; the sensitizing agentmaterial is a thermally activated delayed fluorescence material; a singlet-state energy level of the thermally activated delayed fluorescence material is located between a singlet-state energy level of the broad-band gap material and a singlet-state energy level of the resonance thermally activated delayed fluorescence material; and a triplet-state energy level of the thermally activated delayed fluorescence material is located between a triplet-state energy level of the broad-band gap material and a triplet-state energy level of the resonance thermally activated delayed fluorescence material.With the organic electroluminescent device and the display device, the defects of short life time and wide spectrum of the device caused by a condition that the traditional TADF material is adopted to emit light at the present stage can be overcome.
    Owner:KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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