SCIENTIA SINICA Informationis, Volume 50 , Issue 1 : 151-162(2020) https://doi.org/10.1360/N112019-00027

Study of the microscopic mechanism of Ir(ppy)$_{3}$ regulating exciton splitting and luminescence process in Rubrene

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  • ReceivedJan 29, 2019
  • AcceptedMay 5, 2019
  • PublishedJan 9, 2020


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  • Figure 1

    (Color online) The device optical and electronic properties. (a) The diagram of device structure; (b) the $I$-$V$ curves of devices, the inset is the molecular structures; (c) the normalized PL spectra of Ir(ppy)$_3$ and Rubrene films;protect łinebreak (d) the brightness intensity of devices with different concentrations under various injection currents at room temperature

  • Figure 2

    (Color online)The MEL response curves of the reference device and the Rubrene: 10%Ir(ppy)$_3$device at different temperatures and injection currents. (a)–(d) Rubrene: 10%Ir(ppy)$_3$ devices; (e)–(h) reference devices

  • Figure 3

    (Color online) (a) Temperature-dependent MEL curves of the Rubrene:10%Ir(ppy)$_{3}$ device at 10 $\mu~$A;protect łinebreak (b) temperature-dependentMEL$_{\rm~HFE}$ values of the reference device and the Rubrene:10%Ir(ppy)$_{3}$ device

  • Figure 4

    (Color online) (a) Mixing concentrations-dependent MEL curves ofdevice Rubrene: $x$%Ir(ppy)$_{3}$ at room temperature when the current is 10$\mu~$A; (b) mixing concentrations-dependent MEL$_{\rm~HFE}$ value underdifferent currents at room temperature; (c) mixing concentrations-dependentMEL curves of device Rubrene: $x$%Ir(ppy)$_{3}$ at 20 K when the current is10 $\mu~$A; (d) mixing concentrations-dependent MEL$_{\rm~HFE}$ value underdifferent temperature at 10 $\mu~$A

  • Figure 5

    (Color online) (a) The microscopic processes of devices; (b) theschematic of microscopic process of exciton and polaron betweenIr(ppy)$_{3}$ and Rubrene at low concentration mixing; (c) the MEL$_{B~=~300}$ values and brightness intensity of devices with various differentconcentrations at room temperature and the injection current of 10 $\mu~$A;(d) the schematic of microscopic process of exciton and polaron betweenIr(ppy)$_{3}$ and Rubrene at high concentration mixing. The circlesrepresent Rubrene, and the triangles represent Ir(ppy)$_{3~}$ in (b) and (d)