Light emitting device

Abstract

A light emitting device includes a light emitting unit, a light transmissive layer and an encapsulant. The light emitting unit includes a substrate, an epitaxial structure layer disposed on the substrate, and a first electrode and a second electrode disposed on the same side of the epitaxial structure layer, respectively. The light emitting unit is disposed on the light transmissive layer and at least a part of the first electrode and a part of the second electrode are exposed by the light transmissive layer. The encapsulant encapsulates the light emitting unit and at least exposes a part of the first electrode and a part of the second electrode. Each of the first electrode and the second electrode extends outward from the epitaxial structure layer, and covers at least a part of an upper surface of the encapsulant, respectively.

What is claimed is: 
     
         1 . A light emitting device, comprising:
 a light emitting unit, comprising:
 a substrate, 
 an epitaxial structure layer, disposed on the substrate; and 
 a first electrode and a second electrode, respectively disposed on a same side of the epitaxial structure layer opposite to the substrate; and 
   an encapsulant encapsulating the light emitting unit and at least exposing a part of the first electrode and a part of the second electrode, wherein the first electrode and the second electrode extend outwardly to protrude from a lower surface of the encapsulant respectively;   wherein the first electrode comprises a first electrode portion connected to the epitaxial structure layer and a first electrode extending portion connected to the first electrode portion, the second electrode comprises a second electrode portion connected to the epitaxial structure layer and a second electrode extending portion connected to the second electrode portion, wherein the first electrode extending portion and the second electrode extending portion respectively comprise an adhesion layer and a barrier layer disposed between the adhesion layer and the epitaxial structure layer.   
     
     
         2 . The light emitting device as claimed in  claim 1 , wherein a material of the adhesion layer comprises gold, tin, aluminium, silver, copper, indium, bismuth, platinum, gold-tin alloy, tin-silver alloy, tin-silver-copper alloy (Sn—Ag—Cu (SAC) alloy) or a combination thereof, and a material of the barrier layer includes nickel, titanium, tungsten, gold or an alloy of a combination thereof. 
     
     
         3 . The light emitting device as claimed in  claim 2 , wherein the first electrode extending portion and the second electrode extending portion respectively comprise a reflection layer disposed between the barrier layer and the epitaxial structure layer. 
     
     
         4 . The light emitting device as claimed in  claim 3 , wherein a material of the reflection layer comprises gold, aluminium, silver, nickel, titanium, or an alloy of a combination thereof. 
     
     
         5 . A light emitting device, comprising:
 a light emitting unit, comprising:
 a substrate, 
 an epitaxial structure layer, disposed on the substrate; and 
 a first electrode and a second electrode, respectively disposed on a same side of the epitaxial structure layer opposite to the substrate; and 
   an encapsulant encapsulating the light emitting unit and at least exposing a part of the first electrode and a part of the second electrode, wherein the first electrode and the second electrode extend outwardly to protrude from a lower surface of the encapsulant respectively;   wherein the first electrode and the second electrode respectively comprise an adhesion layer, a reflection layer and a barrier layer disposed between the adhesion layer and the reflection layer, and the reflection layer is disposed between the barrier layer and the epitaxial structure layer.   
     
     
         6 . The light emitting device as claimed in  claim 5 , wherein a material of the adhesion layer comprises gold, tin, aluminium, silver, copper, indium, bismuth, platinum, gold-tin alloy, tin-silver alloy, tin-silver-copper alloy (Sn—Ag—Cu (SAC) alloy) or a combination thereof, and a material of the barrier layer includes nickel, titanium, tungsten, gold or an alloy of a combination thereof. 
     
     
         7 . The light emitting device as claimed in  claim 5 , wherein a material of the reflection layer comprises gold, aluminium, silver, nickel, titanium, or an alloy of a combination thereof.