Composition for forming a quantum dot layer, quantum dot film, backlight unit, and liquid crystal display

A composition for forming a quantum dot layer comprising:

• (A) at least one active energy ray-curable compound having an ethylenically unsaturated double bond,
• (B) at least one thiol compound having at least two mercapto groups in one molecule,
• (C) a photo-initiator,
• (D) quantum dot particles, and
• (E) scattering particles,
• wherein the composition contains 0.28 to 0.77 equivalents of the at least one thiol compound (B) per one equivalent of the at least one active energy ray-curable compound (A),
• wherein a W value of the at least one active energy ray-curable compound (A) calculated by Math formula 1 is 3.44 to 4.57,
• wherein the at least one active energy ray-curable compound (A) contains 10 to 40% by weight of an active energy ray-curable compound having at least 3 functionalities of ethylenically unsaturated double bonds relative to a total weight of the at least one active energy ray-curable compound (A):
• Math formula 1
• W=Σ1n(log Pn×WFn)
• wherein,
• log Pn:
• water/octanol partition coefficient of n substance, and
• WFn:
• weight fraction of n substance, Σ1nWFn=1;
• and
• wherein the at least one active energy ray-curable compound (A) contains 60 to 100% by weight of a compound having a water/octanol partition coefficient log P of 3.5 or more.