Light emitting device and backlight unit using the same

A light emitting device comprising:

• a package with a recess having a bottom face and a side wall;
• a light emitting element mounted on the bottom face of the recess of the package;
• and
• a sealing member filled in the recess of the package, with which the light emitting element is coated;
• wherein
• the package is a semiaromatic polyamide resin comprising from 5 to 70% by weight of potassium titanate fibers and/or wollastonite, from 10 to 50% by weight of titanium oxide, and from 15 to 85% by weight of a semiaromatic polyamide containing 20 mol % or more of an aromatic monomer, wherein the semiaromatic polyamide resin comprises an amide group, an amount of which is 30 g or less in 100 g of the semiaromatic polyamide resin,
• the sealing member is made of an addition reaction-crosslinkable silicone which transmits light and adheres to the semiaromatic polyamide resin of the package,
• wherein the light emitting element is a nitride-based compound semiconductor light emitting element having a peak emission wavelength at 360 to 550 nm,
• wherein the package is in the form having a longitudinal direction and a short axial direction when observed from the side where the recess is opened, and
• wherein the thickness of the side wall formed along the longitudinal direction of the side wall is thinner than the side wall formed along the short axial direction of the side wall.

A light emitting device comprising:

• a package with a recess having a bottom face and a side wall;
• a light emitting element mounted on the bottom face of the recess of the package;
• and
• a sealing member filled in the recess of the package, with which the light emitting element is coated;
• wherein
• the package is a semiaromatic polyamide resin comprising from 20 to 60% by weight of potassium titanate fibers and/or wollastonite, from 10 to 50% by weight of titanium oxide, and from 40 to 80% by weight of a semiaromatic polyamide containing 20 mol % or more of an aromatic monomer, wherein the semiaromatic polyamide resin comprises an amide group, an amount of which is 30 g or less in 100 g of the semiaromatic polyamide resin,
• the sealing member is made of an addition reaction-crosslinkable silicone, and
• wherein the light emitting element is a nitride-based compound semiconductor light emitting element having a peak emission wavelength at 360 to 550 nm,
• wherein the package has a longitudinal direction viewed from an opening side of the recess, and the part of the side wall of the recess of the package having the thickness of 100 μm or less places along the longitudinal direction of the package.