OPTICAL SEMICONDUCTOR ELEMENT ENCAPSULATION SHEET

Japanese Patent JP2023164766

A

To provide an optical semiconductor element encapsulation sheet excellent in light diffusivity while excellent in light extraction efficiency.SOLUTION: An optical semiconductor element encapsulation sheet 1 is a sheet for encapsulating one or more optical semiconductor elements 6 arranged on a substrate 5, and includes an encapsulation part 2 having a light diffusion layer and an antireflection layer. In the optical semiconductor element encapsulation sheet 1, in a state where a functional layer is laminated on one side of the sheet 1, values of L*1, a*1 and b*1 at L*a*b*(SCE) when measured from the functional layer side and L*2, a*2 and b*2 at L*a*b*(SCE) when measured from the sheet 1 side satisfy expressions (1) to (3), respectively: -5