A composition for encapsulation of an organic light emitting diode, comprising: a photocurable monomer; a silicon-containing monomer; and an initiator, wherein the silicon-containing monomer is represented by Formula 1:, wherein R 1 and R 2 are the same or different and are each independently a single bond, a substituted or unsubstituted C 1 to C 20 alkylene group, a substituted or unsubstituted C 1 to C 30 alkylene ether group, *-N(R')-R"-* (wherein * represents a binding site for an element, R' is a substituted or unsubstituted C 1 to C 30 alkyl group, and R" is a substituted or unsubstituted C 1 to C 20 alkylene group), a substituted or unsubstituted C 6 to C 30 arylene group, a substituted or unsubstituted C 7 to C 30 arylalkylene group, *-O-R"-* (wherein * represents a binding site for an element and R" is a substituted or unsubstituted C 1 to C 20 alkylene group); X 1, X 2, X 3, X 4, X 5 and X 6 are the same or different and are each individually hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 1 to C 30 alkyl ether group, *-N(R')(R") (wherein * represents a binding site for an element, and R' and R" are the same or different and are hydrogen or a substituted or unsubstituted C 1 to C 30 alkyl group), a substituted or unsubstituted C 1 to C 30 alkylsulfide group, a substituted or unsubstituted C 6 to C 30 aryl group, or a substituted or unsubstituted C 7 to C 30 arylalkyl group; at least one of X 1, X 2, X 3, X 4, X 5 and X 6 is a substituted or unsubstituted C 6 to C 30 aryl group; Y 1 and Y 2 are the same or different and are represented by Formula 2: wherein * represents a binding site of an element and Z is hydrogen or a substituted or unsubstituted C 1 to C 30 alkyl group; and n is an integer from 0 to 30, or ranges on average from 0 to 30; wherein the photocurable monomer comprises at least one of components i), ii), iii), iv) and v): i) mono(meth)acrylates of C 1 to C 30 monohydric alcohols; ii) monoalkylene glycol di(meth)acrylate, polyalkylene glycol di(meth)acrylate, or a mixture thereof; iii) di(meth)acrylates of C 2 to C 20 diol, triol, tetraol, pentaol or hexaol; iv) tri(meth)acrylates of C 3 to C 20 triol, tetraol, pentaol or hexaol; and v) tetra(meth)acrylate of C 4 to C 20 tetraol, pentaol or hexaol; wherein the total amount of the photocurable monomer and the silicon-containing monomer in the composition for encapsulation of an organic light emitting diode is in the range of ≥ 95 wt% to ≤ 99 wt%, based on the total weight of the photocurable monomer, the silicon-containing monomer and the initiator. R 1 and R 2 are the same or different and are each independently a single bond, a substituted or unsubstituted C 1 to C 20 alkylene group, a substituted or unsubstituted C 1 to C 30 alkylene ether group, *-N(R')-R"-* (wherein * represents a binding site for an element, R' is a substituted or unsubstituted C 1 to C 30 alkyl group, and R" is a substituted or unsubstituted C 1 to C 20 alkylene group), a substituted or unsubstituted C 6 to C 30 arylene group, a substituted or unsubstituted C 7 to C 30 arylalkylene group, *-O-R"-* (wherein * represents a binding site for an element and R" is a substituted or unsubstituted C 1 to C 20 alkylene group); X 1, X 2, X 3, X 4, X 5 and X 6 are the same or different and are each individually hydrogen, a substituted or unsubstituted C 1 to C 30 alkyl group, a substituted or unsubstituted C 1 to C 30 alkyl ether group, *-N(R')(R") (wherein * represents a binding site for an element, and R' and R" are the same or different and are hydrogen or a substituted or unsubstituted C 1 to C 30 alkyl group), a substituted or unsubstituted C 1 to C 30 alkylsulfide group, a substituted or unsubstituted C 6 to C 30 aryl group, or a substituted or unsubstituted C 7 to C 30 arylalkyl group; at least one of X 1, X 2, X 3, X 4, X 5 and X 6 is a substituted or unsubstituted C 6 to C 30 aryl group; Y 1 and Y 2 are the same or different and are represented by Formula 2: wherein * represents a binding site of an element and Z is hydrogen or a substituted or unsubstituted C 1 to C 30 alkyl group; and n is an integer from 0 to 30, or ranges on average from 0 to 30; wherein the photocurable monomer comprises at least one of components i), ii), iii), iv) and v): i) mono(meth)acrylates of C 1 to C 30 monohydric alcohols; ii) monoalkylene glycol di(meth)acrylate, polyalkylene glycol di(meth)acrylate, or a mixture thereof; iii) di(meth)acrylates of C 2 to C 20 diol, triol, tetraol, pentaol or hexaol; iv) tri(meth)acrylates of C 3 to C 20 triol, tetraol, pentaol or hexaol; and v) tetra(meth)acrylate of C 4 to C 20 tetraol, pentaol or hexaol; wherein the total amount of the photocurable monomer and the silicon-containing monomer in the composition for encapsulation of an organic light emitting diode is in the range of ≥ 95 wt% to ≤ 99 wt%, based on the total weight of the photocurable monomer, the silicon-containing monomer and the initiator. i) mono(meth)acrylates of C 1 to C 30 monohydric alcohols; ii) monoalkylene glycol di(meth)acrylate, polyalkylene glycol di(meth)acrylate, or a mixture thereof; iii) di(meth)acrylates of C 2 to C 20 diol, triol, tetraol, pentaol or hexaol; iv) tri(meth)acrylates of C 3 to C 20 triol, tetraol, pentaol or hexaol; and v) tetra(meth)acrylate of C 4 to C 20 tetraol, pentaol or hexaol;