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Fig. 6 | Nanoscale Research Letters

Fig. 6

From: Efficient Trilayer Phosphorescent Organic Light-Emitting Devices Without Electrode Modification Layer and Its Working Mechanism

Fig. 6

a C-V plots (scattered points, f = 1 kHz) and L-V curves (solid line) for the three different PHOLEDs-CBP-doped Ir(ppy)3 (green), Ir(MDQ)2(acac) (red), and FIrpic (blue), respectively. The purple dashed lines marked in the graph representing the Von. Where the arrows line point are the inflection points in the curves. Schematic energy-level diagrams on an ITO/TAPC (50 nm)/CBP:10 wt% × (30 nm)/Bphen (50 nm)/Mg:Ag (120 nm) OLED. The X is b Ir(ppy)3 (green), c Ir(MDQ)2(acac) (red), and d FIrpic (blue). Two recombination mechanisms occur probably in EML, marked as I (Langevin recombination) and II (trap-assisted recombination). Additionally, the blue point represents hole, while the pink point is electron. e Green phosphorescent OLED based on CBP:Ir(ppy)3. f Red phosphorescent OLED based on CBP:Ir(MDQ)2(acac). Triplet and polaron densities (blue and black lines) are calculated according to Eqs. (4)–(7)

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