Molecular engineering of an electron-transport triarylphosphine oxide-triazine conjugate toward high-performance phosphorescent organic light-emitting diodes with remarkable stability

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  • ReceivedJan 8, 2020
  • AcceptedFeb 29, 2020
  • PublishedApr 9, 2020


Funded by

the National Key Research and Development Program of China(2016YFB0400701)

Natural Science Foundation of Guangdong Joint Program(U1801258,U1301243)

and Department of Science and Technology of Guangdong Province(2019B010924003)


This work was supported by the National Key Research and Development Program of China (2016YFB0400701), Natural Science Foundation of Guangdong Joint Program (U1801258, U1301243), and Department of Science and Technology of Guangdong Province (2019B010924003).

Interest statement

The authors declare that they have no conflict of interest.


Supporting Information

The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.


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  • Figure 1

    Chemical structure of BPTRZ-Py-TPO (color online).

  • Scheme 1

    Synthetic route to BPTRZ-Py-TPO: i) Pd(PPh3)4, 2 M Na2CO3 aqueous solution, ethanol, toluene, 90 °C; ii) bis(pinacolato)diboron, Pd(PPh3)2Cl2, anhydrous KOAc, THF, 80 °C (color online).

  • Figure 2

    (a) Thermogravimetric analysis and (b) DSC diagrams of BPTRZ-Py-TPO (color online).

  • Figure 3

    (a) Normalized UV absorbance (Abs) and fluorescence (FL) spectra of BPTRZ-Py-TPO in CH2Cl2 (~1.0´10–5 mol L–1) and as film on quartz glass, excitation: 310 nm. (b) Normalized phosphorescence spectrum of BPTRZ-Py-TPO was collected after delay time of 1 ms upon excitation at 77 K in solid state, excitation: 350 nm (color online).

  • Figure 4

    UPS spectra (a) at the low kinetic energy region and (b) at the valence band near the Fermi level for 10 nm BPTRZ-Py-TPO on ITO, respectively (color online).

  • Figure 5

    J-V characteristic of the electron-only device: ITO/BPTRZ-Py-TPO:Liq (1:1 wt/wt, 150 nm)/Al) (color online)

  • Figure 6

    (a) J-V-L, (b) LE-L, (c) PE-L curves, and (d) EL spectra of the green PHOLEDs (ITO/OMET-P008:p-dopant (100 nm, 4%)/HTL(15 nm)/EBL(5 nm)/HOST1:HOST2:Ir(ppy)2(m-mbppy) (30 nm, 1:1:0.3)/ETM:Liq(30 nm, 1:1 wt/wt)/Al). ETM=BPTRZ-Py-TPO and Phen-NaDPO (color online).

  • Figure 7

    Luminance decay characteristics of the encapsulated bottom-emission green OLEDs (ITO/OMET-P008:p-dopant(100 nm, 4%)/HTL(15 nm)/EBL(5 nm)/HOST1:HOST2:Ir(ppy)2(m-mbppy)(30 nm, 1:1:0.3)/ETM:Liq(30 nm, 1:1 wt/wt)/Al), driven under a constant current. ETM=BPTRZ-Py-TPO and Phen-NaDPO. The initial luminance was set as ca. 1000 cd m–2. Prior to testing, both OLEDs aged at a current density of 20 mA cm–2 for 24 h(color online).

  • Table 1   Table 1 Summary of the OLED data



    @ ca. 1000 cd m−2


    @1000 nit (h)

    CIE(x, y)

    V (V)

    J (mA cm−2)

    LE (cd A−1)

    PE (lm W−1)

    EQE (%)









    (0.32, 0.64)








    (0.31, 0.64)

    Top emission








    (0.24, 0.72)


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