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Chinese Optics Letters, Volume. 15, Issue 5, 051602(2017)

Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices

Jong Hyun Lim1,2, Jin Wook Kim3、*, Geum Jae Yoon1, Ayse Turak4, and Woo Young Kim1,4、**
Author Affiliations
  • 1Department of Green Energy & Semiconductor Engineering, Hoseo University, Asan 31499, Korea
  • 2R&D Center, A-PRO Co. Ltd., Gunpo 15830, Korea
  • 3Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong 070, China
  • 4Department of Engineering Physcis, McMaster University, Hamilton, Ontario L8S 4L7, Canada
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    Schematic structure of white PHOLEDs and configuration molecules of organic materials in EML.

    Fig. 1. Schematic structure of white PHOLEDs and configuration molecules of organic materials in EML.

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    (a–c) Predicted white OLED devices A, B, and C spectra (black line) combining the PL of the RGB of each dopant and the comparison based upon the CMF formula of X, Y, and Z.

    Fig. 2. (a–c) Predicted white OLED devices A, B, and C spectra (black line) combining the PL of the RGB of each dopant and the comparison based upon the CMF formula of X, Y, and Z.

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    (a–c) Luminous efficiencies – luminance characteristics of white PHOLEDs with different red phosphorescent dopants and (d) a comparison between optimized white PHOLEDs with 0.6%, 0.4%, and 0.8% dopant concentration, respectively.

    Fig. 3. (a–c) Luminous efficiencies – luminance characteristics of white PHOLEDs with different red phosphorescent dopants and (d) a comparison between optimized white PHOLEDs with 0.6%, 0.4%, and 0.8% dopant concentration, respectively.

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    CIEXY coordinates of white PHOLEDs with different red phosphorescent dopants, (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4 (the direction of the arrow is related to 5, 7.5, and 10 V, respectively), and (d) the EL spectrum of optimized devices A3, B2, and C4.

    Fig. 4. CIEXY coordinates of white PHOLEDs with different red phosphorescent dopants, (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4 (the direction of the arrow is related to 5, 7.5, and 10 V, respectively), and (d) the EL spectrum of optimized devices A3, B2, and C4.

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    PL spectrum of mCP, FIrpic, and Ir(ppy)3, and the EL spectrum of mCP as host materials and the absorption spectrum of (a) Ir(piq)3, (b) Ir(pq)2(acac), and (c) Ir(btp)2(acac).

    Fig. 5. PL spectrum of mCP, FIrpic, and Ir(ppy)3, and the EL spectrum of mCP as host materials and the absorption spectrum of (a) Ir(piq)3, (b) Ir(pq)2(acac), and (c) Ir(btp)2(acac).

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    J-V characteristics of white PHOLEDs with different red phosphorescent dopants: (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4, and (d) optimized devices A3, B2, and C4.

    Fig. 6. J-V characteristics of white PHOLEDs with different red phosphorescent dopants: (a) Ir(piq)3 A1–A4, (b) Ir(pq)2(acac) B1–B4, (c) Ir(btp)2(acac) C1–C4, and (d) optimized devices A3, B2, and C4.

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    • Table 1. Schematic of the Different Red Phosphorescent Dopant Materials and Concentration Used in White PHOLEDs

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      Table 1. Schematic of the Different Red Phosphorescent Dopant Materials and Concentration Used in White PHOLEDs

      DevicesEML configuration of Devices A1–A4, B1–B4, and C1–C4 of White PHOLEDs
      White PHOLED A1–A4mCP:FIrpic−8.0%:Ir(ppy)3−0.5%:Ir(piq)3−x%
      White PHOLED B1–B4mCP:FIrpic−8.0%:Ir(ppy)3−0.5%:Ir(pq)2(acac)−x%
      White PHOLED C1–C4mCP:FIrpic−8.0%:Ir(ppy)3−0.5%:Ir(btp)2(acac)−x%

    • Table 2. Summary of Electrical and Optical Properties of Optimized White PHOLEDs with Different Red Dopants A3, B2, and C4

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      Table 2. Summary of Electrical and Optical Properties of Optimized White PHOLEDs with Different Red Dopants A3, B2, and C4

      White PHOLEDsDriving VoltageMaximum Luminous EfficiencyCRIΔCIEXY from 5 V to 10 VCIEXY at 10.0 V
      Ir(piq)3, A34.5 V11.0 cd/A61.8(−0.072, −0.006)(0.340, 0.375)
      Ir(pq)2(acac), B24.5 V17.2 cd/A72.9(−0.060, −0.017)(0.367, 0.402)
      Ir(btp)2(acac), C45.0 V10.3 cd/A50.0(−0.060, −0.025)(0.232, 0.388)
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    Jong Hyun Lim, Jin Wook Kim, Geum Jae Yoon, Ayse Turak, Woo Young Kim. Effect of various red phosphorescent dopants in single emissive white phosphorescent organic light-emitting devices[J]. Chinese Optics Letters, 2017, 15(5): 051602

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    Paper Information

    Category: Materials

    Received: Dec. 9, 2016

    Accepted: Jan. 24, 2017

    Published Online: Jul. 23, 2018

    The Author Email: Jin Wook Kim (jwkim@eee.hku.hk), Woo Young Kim (wykim@hoseo.edu)

    DOI:10.3788/COL201715.051602

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology