▎ 摘　　要

NOVELTY - Encapsulating material produced by alternately laminating a first coating layer made of silane sol, and a second coating layer made of graphene, is claimed. USE - The encapsulating material is useful for producing organic light emitting display device (claimed). ADVANTAGE - The encapsulating material has excellent water vapor transmission rate, and effectively blocks inflow of oxygen or moisture. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing organic light emitting display device, comprising (a) forming an organic light-emitting device to top of a substrate, (b) laminating the encapsulating material on including a first coating layer made of silane sol, and a second coating layer made of graphene, to top of the organic light emitting device. The graphene is expandable graphite produced by performing hydrothermal expansion.