This research presents fabrication process of an encapsulation layer for organic light-emitting diodes(OLED) and its optical performance. We have developed a novel encapsulation layer for organic light-emitting diodes(OLEDs) using poly(dimethysiloxane) (PDMS) including scattering particles. This encapsulation layer can be fabricated by the solution process. The OLED with the proposed encapsulation layer has an excellent optical performance. The external quantum efficiency(EQE) has been improved by 42%. We expect the proposed encapsulation layer will be used where EQE is a key factor.