| 摘要 |
A thermal conductive sheet contains a plate-like boron nitride particle, has a thermal conductivity in a direction perpendicular to the thickness direction of the thermal conductive sheet of 4 W/m·K or more, and has a volume resistivity of 1×1010Ω·cm or more. The transmittance of light at a wavelength of 500 nm is 10% or less. The surface reflectance R of light at 500 nm is 70% or more relative to the surface reflectance of barium sulfate as 100%. A light-emitting diode mounting substrate includes a substrate for mounting a light-emitting diode; and a thermal conductive light reflection layer being formed on the surface of the substrate and including the above-described thermal conductive sheet. A thermal conductive adhesive sheet includes a thermal conductive layer including the above-described thermal conductive sheet, and an adhesive layer or a pressure-sensitive adhesive layer laminated on at least one side of the thermal conductive layer.
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