NOVELTY - Photocurable composition comprises a photocurable monomer, and a monomer (I).    USE - The composition is useful in an encapsulated device such as an organic light emitting display (all claimed) including an organic light emitting device, an organic LED, a solar cell or a LCD.    ADVANTAGE - The composition provides the organic light emitting display with improved self-luminance, fast response, wide viewing angle, ultra-thinness, high definition and durability.    DETAILED DESCRIPTION - Photocurable composition comprises a photocurable monomer, and a monomer having a structure of formula (A1-Q1(=X3)(A2)-A3) (I).    Q1 = P (preferred) or As;    R = 1-30C-alkyl, 6-30C-aryl, 7-30C-arylalkyl (all optionally substituted) or H;    A1-A3 = 1-30C-alkyl, 6-30C-aryl (both optionally substituted), -C(=X4)-Y1-Z1 or -Y1-Z1-, where at least one of A1-A3 is -C(=X4)-Y1-Z1 or -Y1-Z1-;    Y1 = 1-30C-alkylene, 6-30C-arylene, 7-30C-arylalkylene or 7-30C-alkylarylene (all optionally substituted);    Z1 = R1-C(=CH2)-C(=O)-X1-, R1-C(=CH2)-C(=O)-X1-R2- or R1-C(=CH2)-C(=O)-X1-(R2-X2)n1-;    R1 = 1-30C-alkyl (optionally substituted) or H;    R2 = 1-30C-alkylene, 6-30C-arylene, 7-20C-arylalkylene or 1-30C-alkyleneoxy (all optionally substituted);    X1-X4 = O, S or NR, where preferably X1-X3 are O; and    n1 = 1-20.    INDEPENDENT CLAIMS are included for:    (1) an encapsulated device (100) encapsulated with the composition; and    (2) an organic light emitting display apparatus comprising a substrate (10), an organic LED on the substrate, an inorganic protective layer (31) encapsulating the organic LED, and an organic protective layer (32) stacked on the inorganic protective layer, where the organic protective layer has an outgas generation amount of less than or equal to 1000 ppm.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an encapsulated apparatus.    Substrate (10)    Protective layer (30)    Inorganic protective layer (31)    Organic protective layer (32)    Encapsulated apparatus. (100)