Abstract:
A fabrication method for a light-emitting element package, the method comprising: providing a high precision wafer level mold module, the high precision wafer level mold module comprising an upper mold and a bottom mold; mounting a substrate with a plurality of light-emitting elements between the upper mold and the bottom mold; filling package materials into the high precision wafer level mold module to obtain package members mounted on the light-emitting elements; and removing the high precision wafer level mold module.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This patent application is a divisional application of patent application Ser. No. 13/113,081, filed on May 23, 2011, entitled “LIGHT-EMITTING ELEMENT PACKAGE AND FABRICATION METHOD THEREOF,” which is assigned to the same assignee as the present application, and which is based on and claims priority from Chinese Patent Application No. 201010187222.0 filed in China on May 31, 2010. The disclosures of patent application Ser.. No. 13/113,081 and the Chinese Patent Application are incorporated herein by reference in their entirety. 
     
    
     BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The disclosure relates generally to semiconductor packages, and more particularly to a light-emitting element package and fabrication method for the package. 
         [0004]    2. Description of the Related Art 
         [0005]    Frequently, photonic crystal patterns are formed on LED packaging by nano-imprint lithography. However, precision of the nano-imprint lithography process is limited, such that illumination efficiency of the LED is impaired. Therefore, there is a need for improvement in the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    Many aspects of the embodiments can be better understood with references to the following drawings. The components in the drawings are not necessary drawn to scale, the emphasis instead being placed upon clear illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout two views. 
           [0007]      FIGS. 1-4  are cross-sections of a light-emitting element package in accordance with one embodiment of the disclosure. 
           [0008]      FIG. 5  is a top view of the light-emitting element package in  FIG. 1 . 
           [0009]      FIG. 6  is a schematic view of a fabrication method for a light-emitting element package in accordance with a first embodiment of the disclosure. 
           [0010]      FIGS. 7-9  are schematic views of a fabrication method for a light-emitting element package in accordance with a second embodiment of the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0011]    The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessary to the same embodiment, and such references mean at least one. 
         [0012]    Referring to  FIGS. 1-5 , a light-emitting element package  1  in accordance with one embodiment of the disclosure includes a package member  10  and a light-emitting element  12 . The package member  10  is configured for encapsulating the light-emitting element  12 . In the embodiment, the package member  10  is a lens. A receiving portion  100  is defined in the package member  10 . The package member  10  includes an interior surface  102 , an exterior surface  104  and a light incident surface  103 . The light incident surface  103  is located at the bottom of the package member  10  and configured for receiving light from the light-emitting element  12 . 
         [0013]    A plurality of photonic crystal patterns  20  can be formed on the exterior surface  104 , interior surface  102  or the light incident surface  103 . The photonic crystal patterns  20  also can be formed on some or all of the surfaces  102 ,  103 ,  104  of the package member  10 . 
         [0014]    Each of the photonic crystal patterns  20  is consisted of photonic crystals. The photonic crystal is composed of periodic dielectric or metallo-dielectric nanostructures that affect the propagation of electromagnetic waves (EM) in the same way as the periodic potential in a semiconductor crystal affects the electron motion by defining allowed and forbidden electronic energy bands. 
         [0015]    The diameter of each of the photonic crystals is about 1000 μm. In the embodiment, the diameter of the photonic crystal is a half of visible light wavelength or under 350 μm. 
         [0016]    The distribution density of the photonic crystal patterns of the package member  10  can be a gradient distribution or corresponding to the light distribution of the light-emitting element  12 . In the embodiment, the distribution density of the photonic crystal patterns  20   a  in the center of the package member  10  exceeds that of photonic crystal patterns  20   b,    20   c,    20   d  in other areas. 
         [0017]    The distribution density of photonic crystal patterns  20   a,    20   b,    20   c,    20   d  decreases in turn to form a gradient distribution. 
         [0018]    The photonic crystal patterns  20  can be formed by a high precision wafer level mold module  30 . The photonic crystal patterns  20  can be formed as a film to be coated on the interior surface  102 , exterior surface  104  or light incident surface  103  of the package member  10 . 
         [0019]    Referring to  FIG. 6 , a fabrication method for light-emitting element package  1  in accordance with a first embodiment of the disclosure is as follows. 
         [0020]    First, a high precision wafer level mold module  30  is provided, including an upper mold  302  and a bottom mold  304 . 
         [0021]    Second, a plurality of photonic crystal patterns  20  is formed on the upper mold  302  and the bottom mold  304 . 
         [0022]    Third, package materials are filled in the wafer level mold module  30  to obtain the package member  10  ( FIG. 1 ). Thus, the package member  10  is formed with photonic crystal patterns  20 . The photonic crystal patterns  20  can be formed on the exterior surface  102  or light incident surface  103  of the package member  10 . 
         [0023]    The package material can include phosphor elements or light diffusion agents. The phosphor elements can be YAG, TAG, silicate, nitride, nitrogen oxide, phosphide, sulfide or a combination thereof. 
         [0024]    The light diffusion agent can be SiO 2  series light diffusion agent, TiO 2  series light diffusion agent or CaCO 3  series light diffusion agent. The light diffusion agent is configured for increasing diffusing and transmitting of the light from light-emitting element  12  to increase the illumination efficiency of the light-emitting element package  1 . 
         [0025]    Finally, the package member  10  is mounted on the light-emitting element  12 . 
         [0026]    The photonic crystal patterns  20  of the high precision wafer level mold module  30  can be formed by electroforming or high intensity beam. 
         [0027]    Referring to  FIGS. 7-9 , a fabrication method for light-emitting element package  1  in accordance with a second embodiment of the disclosure is as follows. 
         [0028]    First, a plurality of light-emitting elements  12  ( FIG. 9 ) is mounted on a substrate  14 . 
         [0029]    Second, a wafer level mold module  31  is provided. The wafer level mold module  31  includes a plurality of upper molds  312  and a bottom mold  314 . A plurality of recesses  313  is defined between the upper molds  312 . A plurality of photonic crystal patterns  20  is formed on interior surfaces of the upper molds  312 . 
         [0030]    Third, the substrate  14  is mounted between the upper molds  312  and the bottom mold  314 . The melted package materials are filled in the upper molds  312  through the recesses  313  to obtain the package members  10  ( FIG. 9 ). The melted package materials are glass, silicon, polycarbonate (PC) or polymethyl methacrylate (PMMA). 
         [0031]    Fourth, the upper molds  312  and the bottom mold  314  are separated to obtain a semi-finished product as shown in  FIG. 9 . 
         [0032]    Final, a plurality of light-emitting element packages is obtained by dicing the semi-finished product along lines  315  by laser or water jet. 
         [0033]    Thus, illumination efficiency of the light-emitting element package  1  is optimized according to the photonic crystal patterns  20  of the package member  10 . 
         [0034]    While the disclosure has been described by way of example and in terms of exemplary embodiment, it is to be understood that the disclosure is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.