Patent ID: 8399270

Claim:
A method of manufacturing an organic light emitting device, the method comprising: forming an organic light emitting unit on a substrate, the organic light emitting unit comprising a first electrode, a second electrode and an organic layer interposed between the first and second electrodes; coating on a surface of an encapsulation substrate a composition comprising a sealant, at least one water vapor absorption material and a solvent, wherein the sealant is substantially transparent and has a water vapor transmission rate (WVTR) of about 20 g/m 2 ·day or less, wherein the WVTR is measured using a film of the sealant having a thickness of 100 μm in an environment at the temperature of 38° C. and the relative humidity of 100%, wherein the at least one water vapor absorption material is selected from the group consisting of metal oxide and metal salt having an average particle size of about 100 nm or less; and arranging the encapsulation substrate and the substrate such that the composition contacts the organic light emitting unit between the encapsulation substrate and the organic light emitting unit; and curing the composition so as to form a water vapor absorption material-containing sealant layer.