Electroluminescence spectra of reference OLED (Black solid line) and OLEDs with VP400 (Olive dash line), VP450 (Blue dot line) and VP500 (Red dash dot line) films.

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... light extraction effect of our visible parylene films on bottom-emitting OLEDs was analyzed. Figure 3 shows the electroluminescence spectra (EL) of OLED devices with or without visible parylene films which were measured by an integrating sphere measurement setup at an applied current density of 2.77 mA/cm 2 . All EL measurements show same spectrum with phosphorescence emission peaks of green Irppy 3 at 520 nm and 548 nm, respectively since the visible parylene films have nearly flat transmittance at the visible range as shown in Fig. 2(a). ...

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... measured by an integrating sphere measurement setup at an applied current density of 2.77 mA/cm 2 . All EL measurements show same spectrum with phosphorescence emission peaks of green Irppy 3 at 520 nm and 548 nm, respectively since the visible parylene films have nearly flat transmittance at the visible range as shown in Fig. 2(a). As shown in Fig. 3, total light emission of bottom-emitting OLEDs with VP400, VP450 and VP500 films is increased by 45.8%, 30.2%, and 8.3% respectively. Maximum outcoupling efficiency is achieved with VP400 film due to its high scattering centers provided by the dimer crystals as already discussed in Fig. 2(b). The increase in light extraction efficiency ...

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... such, the enhanced Luminance, EQE, and PE are calibrated using integrating sphere measurement. Figures 4(a), (b) and (c) show the calibrated Luminance verse Voltage, EQE, and PE of OLED with and without VP400 film, respectively. The enhanced Luminance, EQE, and PE are calibrated with the enhancement factor which is achieved with the VP400 film in Fig. 3. The OLED equipped with the visible parylene film shows enhanced luminance and has higher efficiencies in the whole luminance range. EQE of OLED with or without the visible parylene at 63.1 mA/cm 2 is 18.9% and 13.0%, respectively. The power efficiency is correspondingly enhanced as well. Maximum PE of 41.8 lm/W and 28.7 lm/W is ...