Yi-Hsin Lan

Antireflection and self-cleaning film with moth-eye-like structure for mobile flexible displays (Conference Presentation)

Ambient contrast ratio (A-CR) is a critically important characteristic for mobile displays. For transmissive and emissive displays (such as liquid crystal display, light-emitting diode, and organic light-emitting diode), A-CR decreases dramatically as the ambient light increases, which degrades the image quality, especially for outdoor applications. Moth-eye-like structure greatly reduces the surface reflection and improves A-CR. For a touch panel display, the surface should be robust enough to resist possible mechanical scratches and to self-clean possible contaminations from fingerprints and dusts. In this paper, we demonstrate the moth-eye-like structure fabricated on a hard-coating layer with additional surface treatment for self-cleaning property upon the flexible film. By laminating the film unto a display device, the luminous reflectance is reduced to ~0.23%, which improves the A-CR by ~4X under the sun. Note that although the surface reflection is reduced, the haze remains negligible, implying that the image quality is not blurred. The nanostructure was fabricated on the hard-coating layer which is typically used as the protective film of the mobile display and hence it is anti-scratched. Typically, nanostructure exhibits hydrophobic and olephobic properties. With suitable surface treatment by amphiphilic molecules, such characteristics are further improved with excellent self-cleaning properties. Besides, our nanostructured hard-coating film can be fabricated on different flexible films, such as TAC and PET, which means this broadband antireflection film can be used for flexible displays.

Blue phosphorescent organic light-emitting diode with triazole host achieving high current efficiency

We demonstrated a blue phosphorescent organic light-emitting diode with the maximum current efficiency and power efficiency of 57.4 cd/A and 51.6 lm/W, respectively, based on trizaole derivatives as the host of the emitting layer.

68.3: Achieving High Efficiency White Organic Light-emitting Diodes based on Transient Electroluminescence Analysis

In this paper, High efficiency white organic light emitting diodes (OLEDs) have been analyzed not only through steady-state characteristics but also transient measurement to understand the dynamics in OLEDs. After optimization, the quantum efficiency is reached to 12.88% at 1.04mA/cm2.