Importance

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Abstract

The phosphor sheet of the present invention mainly includes a sheet material that is formed by mixing and solidifying of a phosphor powder and an adhesive material. The sheet material subsequently forms a first surface that receives a light source, and forms a second surface that is located on the opposite side to the first surface for scattering a light source. In addition, the distribution ratio of the phosphor powder as well as the adhesive material within the phosphor sheet is based mainly on the different positions and different distances towards the light source; the distribution ratio of the phosphor powder and the adhesive material increases gradually from the first surface towards the second surface. The phosphor of the present invention is designed to be a sheet material, so as to enable the overall volume of the light emitting device to be reduced. Moreover, distribution ratio of the phosphor powder that is within the phosphor sheet is based on the different positions and different distances towards the light source; and the concentration of the phosphor powder increases gradually from the positions that are closest to the light source to the positions that are furthest away from the light source, so as to prevent the part of highly concentration of phosphor powder within the phosphor sheet coming in direct contact with the light emitting heat source, and thereby causing the deterioration of the phosphor sheet. This may then enables the life span of the light emitting device to be increased.

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First Claim