Light emitting package base structure

A light emitting package base structure, comprising:

• a carrier having a supporting surface and an outer surface surrounding the supporting surface;
• a light emitting chip disposed on the supporting surface and electrically connected to the carrier;
• a light transmission unit disposed on the carrier, wherein the light transmission unit comprises a lens portion and a plane portion connected with each other, and the plane portion has at least one through hole;
• a dam disposed between the carrier and the light transmission unit, surrounding the light emitting chip, wherein the dam abuts against the plane portion and the carrier, and a hermetic receiving space is formed between the dam, the light transmission unit and the carrier, and the light emitting chip is located in the hermetic receiving space, wherein the hermetic receiving space is at vacuum, and the dam has a side surface away from the hermetic receiving space, and a gap is formed between the side surface and the outer surface thereby forming a recess between the plane portion, the side surface and the carrier, and the at least one through hole of the plane portion of the light transmission unit is correspond to a location between the side surface and the outer surface to connect with the recess;
• and
• an adhesive disposed in the recess, and the light transmission unit adhered to the carrier through the adhesive.