High efficiency light emitting diode device

Abstract

A light emitting diode device is provided. The light emitting diode device comprises a light emitting diode element, an encapsulation layer, and a plurality of pillars. The encapsulation layer is disposed on the light emitting diode element, and the pillars are disposed on the encapsulation layer. The pillars are formed by a light transmissible material.

What is claimed is: 
     
         1 . A light emitting diode device, comprising:
 a light emitting diode element;   an encapsulation layer disposed surrounding the light emitting diode element; and   a plurality of pillars disposed on the encapsulation layer, wherein the pillars are formed by a light transmissible material.   
     
     
         2 . The light emitting diode device according to  claim 1 , wherein the encapsulation layer has a first refractive index, and the pillars have a second refractive index smaller than or equal to the first refractive index. 
     
     
         3 . The light emitting diode device according to  claim 2 , wherein the second refractive index have a gradient refractive index gradually decreased along a direction from the part near the encapsulation layer to the part departing from the encapsulation layer. 
     
     
         4 . The light emitting diode device according to  claim 1 , wherein the pillars are regularly or irregularly disposed on the encapsulation layer and are spaced apart from one another. 
     
     
         5 . The light emitting diode device according to  claim 1 , wherein the pillars are circular pillars, elliptical pillars or polygonal pillars. 
     
     
         6 . The light emitting diode device according to  claim 1 , wherein cross-sectional areas of the pillar are gradually decreased or increased along a direction from a near part of the encapsulation layer to a departing part of the encapsulation layer. 
     
     
         7 . The light emitting diode device according to  claim 1 , wherein a width of the pillars is between 1 and 500 μm, and a height of the pillars is between 10 and 500 μm. 
     
     
         8 . The light emitting diode device according to  claim 1 , further comprising a plurality of fluorescent particles distributed within the encapsulation layer. 
     
     
         9 . The light emitting diode device according to  claim 1 , further comprising a plurality of fluorescent particles disposed between the encapsulation layer and the pillars.