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.

Out-coupling efficiency of 2.1 times higher than reference was obtained by using novel light-scattering substrate with white OLED. The substrate utilizes a scattering layer made of high refractive index glass matrix and ceramic particles for the enhancement of out-coupling efficiency combined with a surface coating layer for the leakage suppression. This structure enables high performance OLED lighting devices without losing reliability.

Optical analysis was performed for Organic Light Emitting Diodes (OLEDs) formed on a high refractive index glass (high-n-glass) scattering layer. Angular dependency of luminance for OLEDs fabricated on high-n-glass substrate with a hemisphere high-n-glass lens has a good agreement with the emitting directivity calculated by an interference simulation. Applying this emitting directivity, ray trace simulation was performed for OLEDs on various types of substrates and hemisphere lenses. The calculated out-coupled light flux has a good agreement with the measured values. From the experimental and simulation results, it can be concluded that out-coupling efficiency is 1.7 times compared to the reference, and about 55% of lights out of the OLED device can be extracted to the air by the high-n-glass scattering layer. In this case, the probability of light out-coupling as a function of emitting angle starts at 66% at 0°, and still remains more than 30% up to 70° from the normal direction.

An out-coupling technology using high refractive index glass scattering layer was established. Out-coupling efficiency of 2.1 times higher than reference was obtained by the light-scattering substrate with white OLED. To apply this technology to current production lines of OLED panels, cost-cutting structure and processes for Gen. 2.5 were also developed. We also show the guideline for OLED stacks on the developed substrates.

Glass substrates which realize high out-coupling efficiency OLEDs (organic light emitting diodes) were developed. A scattering layer whose matrix was made of high refractive index glass was formed on a glass substrate, and pores in the glass matrix work as scattering centers. The out-coupling efficiency of an OLED using this substrate is 1.8 times higher compared with an OLED using an untreated glass substrate. Furthermore angular dependency of the color and color variation between panels can be successfully suppressed.