Kei Maeda

40.4: Glass Substrates for OLED Lighting with High Out‐Coupling Efficiency

Glass substrates which realize high out-coupling efficiency OLEDs were developed. A scattering layer whose matrix was made of high refractive index glass was formed on a glass substrate. The out-coupling efficiency of an OLED using this substrate is 1.8 times higher compared with an OLED using an untreated glass substrate.

Mechanical properties and fracture analysis of glass substrate for PDPs

A thermal shock test was carried out using high-strain-point glass substrates for plasma-display panels. From the fracture analysis, the fracture stress was determined and compared with the initial edge strength. It was observed that the edge strength greatly decreased because of micro cracks that formed on the glass surface during testing. Therefore, it is important to prevent the formation of micro cracks in order to avoid failure as well as to minimize thermal stress in the process. Fatigue is also an important parameter in preventing the failure of the glass substrate when the stress on it lasts for a long period of time.