Figures & data
Figure 1. Molecular structure of (a) hydroxyethyl cellulose and (b) tannic acid.
Figure 2. Schematic fabrication process of HECTA film.
Figure 3. Device structures of OLED (a) without HECTA film and (b) with HECTA film.
Figure 4. Actual images of (a) HECTA_0, (b) HECTA_0.5, and (c) HECTA_1.0 film.
Figure 5. Optical microscope images of (a) HECTA_0, (b) HECTA_0.5, and (c) HECTA_1.0 film and field emission scanning electron microscope images of (d) HECTA_0, € HECTA_0.5, and (f) HECTA_1.0 film.
Figure 6. FT-IR spectra of (a) HECTA_0, (b) HECTA_0.5, and (c) HECTA_1.0.
Figure 7. (a) total transmittance (Tt), (b) diffuse transmittance (Td), and (c) haze of HECTA_0-1.0 films.
Figure 8. (a) Current density-voltage-luminance characteristic, (b) external quantum efficiency (EQE) - luminance characteristic, and (c) current efficiency (CE) – luminance characteristics of reference and OLED with HECTA films.
Table 1. Comparison of OLED performance with and without HECTA films.