Patent Abstract:
A method of producing an optoelectronic component includes providing a cavity; introducing a liquid matrix material with phosphor particles distributed therein into the cavity; introducing a semiconductor chip into the matrix material; sedimenting the phosphor particles in the matrix material; and curing the matrix material, wherein a conversion layer including phosphor particles is produced, said conversion layer being arranged on the semiconductor chip.

Full Description:
TECHNICAL FIELD 
     This disclosure relates to a method of producing an optoelectronic component, and to an optoelectronic component. 
     BACKGROUND 
     An optoelectronic component comprises a semiconductor chip. Conversion material is applied on and/or around the semiconductor chip. The semiconductor chip emits primary light, for example, blue light. The conversion material comprises phosphor particles introduced, it matrix material. The phosphor particles convert short-wave primary light into longer-wave secondary light, for example, yellow light. The mixed light composed of primary and secondary light can produce white light. Heat produced in the phosphor particles during operation of the optoelectronic component (so-called Stokes shift), can damage the matrix material if the heat cannot be dissipated, or can be dissipated only to a limited extent to the semiconductor chip. In the following methods, the heat can be dissipated only to a limited extent to the semiconductor chip. The phosphor particles are on average too far away from the semiconductor chip to ensure sufficient heat dissipation. 
     In the case of volume potting in which phosphor particles are distributed homogeneously in a potting composed of a matrix material, the high thermal stress of the matrix material owing to the heat generated in the phosphor particles is disadvantageous. Moreover, a cavity in which the semiconductor chip can be arranged has to be present. 
     As an alternative to volume potting, a large lens, in particular composed of silicone, can be arranged above the semiconductor chip potted with clear matrix material. The phosphor particles are introduced in the lens and therefore relatively far away from the semiconductor chip. Here, too, the thermal properties are disadvantageous since the heat can be dissipated only to a limited extent to the semiconductor chip. The silicone in the large lens is heated greatly by the phosphor particles. The silicone becomes brittle. 
     It could therefore be helpful to provide a method of producing an optoelectronic component and an optoelectronic component, in which the heat generated in the phosphor particles can be effectively dissipated to the semiconductor chip. 
     SUMMARY 
     We provide a method of producing an optoelectronic component including providing, a cavity; introducing a liquid matrix material with phosphor particles distributed therein into the cavity; introducing a semiconductor chip into the matrix material; sedimenting the phosphor particles in the matrix material; and curing the matrix material, wherein a conversion layer including phosphor particles is produced, said conversion layer being arranged on the semiconductor chip. 
     We also provide an optoelectronic component including a substrate, a semiconductor chip arranged on the substrate, a layer composed of phosphor particles, said layer being sedimented on the semiconductor chip, and a body composed of cured matrix material, said body completely enclosing the semiconductor chip. 
     We further provide an optoelectronic component including a substrate, a semiconductor chip arranged on the substrate, a layer composed of phosphor particles, said layer being sedimented on the semiconductor chip, a body composed of a cured first matrix material, said body completely enclosing the semiconductor chip, and a lateral potting material including a second matrix material and scattering particles, which are introduced into the second matrix material, wherein the lateral potting laterally surrounds the body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Various examples of our methods and components are explained in greater detail below with reference to the drawings. Elements that an identical, of identical type or act identically are provided with the same reference signs in the figures. The figures and the size relationships of the elements illustrated in the figures among one another should not be regarded as to scale. Rather, individual elements may be illustrated with an exaggerated size or reduced size in order to enable better illustration and in order to afford a better understanding. 
         FIG. 1  shows a flow chart of two alternative production methods A and B for an optoelectronic component. 
       FIGS. A 1 . 1 , A 1 . 2 , A 1 . 3 , A 1 . 4 , A 1 . 5 , A 2 , A 3  show intermediate products of the production method in accordance with alternative A in a sectional view. 
       FIGS. B 1 . 1 , B 1 . 2 , B 1 . 3 , B 2 , B 3  show intermediate products of the production method in accordance with alternative B in a sectional view. 
         FIG. 2   a  shows an example of an optoelectronic component produced by the production method in accordance with variant A in a sectional view. 
         FIG. 2   b  shows an example of an optoelectronic component produced by the production method in accordance with variant B in a sectional view. 
         FIG. 3   a  shows an example of an arrangement with optoelectronic components with lateral scattering potting in plan view. 
         FIGS. 3   b . 1  and  3   b . 2 , respectively, show an example of an arrangement with optoelectronic components with lateral scattering potting in a sectional view. 
         FIGS. 3   c . 1  and  3   c . 2 , respectively, show an example of an optoelectronic component with lateral scattering potting in a sectional view. 
         FIG. 4  shows an example of an optoelectronic component with lateral scattering potting and a lens in a sectional view. 
     
    
    
     LIST OF REFERENCE SIGNS 
     
         
           100  Optoelectronic component 
           101  Optoelectronic component 
           102  Substrate 
           103  Cavity 
           104  Semiconductor chip contact layer 
           106  Bonding pad on substrate 
           108  Contact pad on semiconductor chip 
           110  Semiconductor chip 
           112  Matrix material (soft) 
           114  Phosphor particles 
           115  Conversion layer 
           116  Bonding wire 
           118  Notch in the substrate 
           120  Partly elastic side walls 
           130  Further matrix material (hard) 
           132  Scattering particles 
           140  Inelastic plate 
           142  Elastic side walls 
           144  Dispenser 
           146  Body 
           148  Side faces of the body 
           150  Imaging optical unit (lens) 
           200  Optoelectronic component 
           201  Optoelectronic component 
       
    
     DETAILED DESCRIPTION 
     We provide methods of producing an optoelectronic component. First, a cavity is provided. Subsequently, a liquid matrix material is introduced into the cavity. Phosphor particles are introduced in the matrix material. Subsequently, a semiconductor chip is introduced into the matrix material. The phosphor particles are subsequently sedimented in the matrix material. Subsequently, the matrix material is cured. A conversion layer comprising phosphor particles is produced in the process. 
     The conversion layer is arranged on the semiconductor chip in direct contact with the semiconductor chip. During wavelength conversion, the phosphor particles generate heat. As a result, the conversion layer sedimented in the matrix material and the surrounding matrix material can become heated. Since the sedimented conversion layer is arranged in direct contact with the semiconductor chip, this heat can be dissipated particularly effectively to the semiconductor chip. The semiconductor chip has a good thermal conductivity. The semiconductor chip can dissipate the heat dissipated from the phosphor particles to a substrate. 
     Furthermore, the flush termination of the conversion layer with the semiconductor chip can prevent the undesirable lateral emission of primary light, in particular blue light, from the optoelectronic component. With the use of semiconductor chips equipped with conversion layers, also called layer transfer method, a gap often remains between the edge of the semiconductor chip and the conversion layer. The primary light can emerge at the edge in an undesirable manner. In the case of volume emitters, based on sapphire chips, the layer transfer method is generally not possible. 
     Silicone, epoxy or a hybrid is used as a matrix material. Silicone-epoxy or silicone-polyester can be used as hybrids. The use of soft silicone having a degree of hardness of approximately Shore A 20 to approximately Shore A 60 preferably of approximately Shore A 40, is particularly advantageous. Soft silicones are less susceptible to cracking (higher elongation at break) and exert lower forces on the bonding wire and the semiconductor chip. It is primarily important for the matrix material to be of very low viscosity before curing. What can be achieved as a result is that phosphor particles sediment rapidly in the matrix material. 
     Forming a cavity is advantageous since therein even semiconductor chips on different substrates can be cast into the matrix material. A printed circuit board, a metal-core circuit board, laminates composed of a punched tape whose openings are closed or a ceramic can serve as substrate. The ceramic is particularly preferred owing to its favorable thermal properties. 
     The phosphor particles can comprise yttrium aluminum garnet or orthosilicates. 
     The phosphor particles are sedimented by the action of gravitational force and/or centrifugal force on the phosphor particles. Sedimentation is particularly advantageous since phosphor particles thereby come into direct proximity to the semiconductor chip and deposit as a conversion layer on the semiconductor chip. As a result, the heat that arises in the phosphor particles during operation of the component can be dissipated particularly well to the semiconductor chip. The matrix material is subjected to a low thermo-oxidative stress. 
     Curing is particularly advantageous since, from the sedimented phosphor particles, a positionally fixed conversion layer thereby arises in the cured matrix material. Curing is subdivided into initial curing during 2 min to 15 min and post-curing during 0.5 h to 4 h. Splitting the curing into initial curing and post-curing is advantageous for the following reason. After initial curing, the molds can be removed and reused for the next parts. Post-curing can be carried out in a furnace as a batch process. In other words, many substrates can be post-cured simultaneously in a single process step. Consequently, fewer potting molds are required overall, which entails a cost saving. 
     Sedimentation is not possible in the case of known molding methods. The molding method has an excessively high throughput for this purpose. The silicone used as matrix material in the molding method is rapidly initially cured. No time remains for sedimentation of phosphor particles. After initial curing, post-curing is effected until the matrix material is solid. Initial curing during the molding method yields 50% to 60% Shore hardness (Shore A, D) and the remaining hardness arises as a result of the post-curing. 
     Preferably, the cavity is produced by arrangement of elastic side walls onto an inelastic plate. The elastic side walls comprise silicone, fluoroelastomers, ethylene-propylene-diene rubber (EPDM) or a thermoplastic elastomer. The inelastic plate comprises metal. The metal can be non-stick-coated with polytetrafluoroethylene (PTFE). The elastic side walls terminate tightly with the inelastic plate. It is particularly advantageous that the cavity is reusable. The elastic side walls and the inelastic plate can be detached from the cured matrix material particularly easily for two different reasons. First, the elastic side walls and the inelastic plate can be coated with Teflon or PTFE. Second, the elastic side walls relax during the removal of the cavity when the pressure on them is reduced. The relaxed elastic side walls have no contact with the cured matrix material. Therefore, they can be detached particularly well from the cured matrix material. The elastic side walls lead to curved side faces of the optoelectronic component. During removal from the mold, the mold easily detaches from the material since the elastic side walls return again to their original straight form. 
     Preferably, a substrate with a semiconductor chip arranged thereon is applied to the elastic side walls of the cavity such that the semiconductor chip faces toward the inelastic plate. 
     Preferably, the volume, which is formed by the substrate, the inelastic plate and the elastic side walls and is filled with the matrix material is compressed. Compression is particularly advantageous since, as a result, the entire semiconductor chip is completely immersed in the liquid matrix material. 
     Preferably, the unit composed of substrate, inelastic plate and elastic side walls in the compressed state is rotated. The unit is rotated about an axis lying in the plane formed between semiconductor chip and substrate. The angle of rotation is 180°. This rotation is particularly advantageous since this makes it possible that the phosphor particles can be sedimented onto the semiconductor chip. 
     As an alternative to the cavity composed of elastic side walls and inelastic plate, the cavity can be produced by the arrangement of partly elastic side walls on a substrate. The partly elastic side walls terminate tightly with the substrate. A semiconductor chip is arranged on the substrate. Forming a cavity with partly elastic side walls is particularly advantageous since the method can be realized with particularly few and simple method steps. The partly elastic side walls can comprise Teflon, non-stick-coated metal or thermoplastics. Therefore, the partly elastic side walls can be detached particularly easily from the cured matrix material. Moreover, the partly elastic side walls can be used repeatedly. 
     Removing the cavity is particularly advantageous since space for materials for further process steps thereby arises at the side faces of the optoelectronic component. 
     Preferably, the optoelectronic component is laterally potted with a further matrix material, into which scattering particles are introduced. This is particularly advantageous since the scattering particles scatter primary light and secondary light back into the first matrix material. This backscattered tight can be at least partly coupled out from the optoelectronic component. The laterally potted matrix material preferably comprises hard silicone. The scattering particles can comprise TiO 2 . The silicone into which the scattering particles are introduced is preferably harder than the silicone into which the phosphor particles are introduced. The hardness range for silicone with scattering particles is greater than Shore A 60. The silicone has a high viscosity. What is achieved by the high viscosity of the silicone is that the scattering particles do not sediment. It is only if the scattering particles are also distributed as homogeneously as possible in the cured further matrix material that tight is effectively scattered back into the matrix material. Hard silicone having a Shore hardness of greater than A 60 can be used for all areas which are intended to perform a mechanical function of the housing or through which sawing is intended to be carried out. Molded lenses also comprise material having a Shore hardness of greater than A 60. 
     Preferably, an imaging optical unit, in particular a lens, is applied to the optoelectronic component. This can be carried out after the removal of the side walls or after the lateral potting with a second matrix material. The lens can be placed onto the optoelectronic component by overmolding. The imaging optical unit is particularly advantageous since it gathers primary and secondary light and concentrates it in the forward direction. It is also advantageous in the case of components with near-chip conversion and a lens that the electromagnetic radiation is converted in a focal plane with the chip. No light is scattered in the lens by phosphor particles. 
     The above-described method of producing an optoelectronic component is advantageous compared to known methods mentioned below by way of example. 
     In layer transfer, phosphor in the form of a converter-filled small plate is applied to that surface of the semiconductor chip facing away from the substrate. The small plate can be a silicone small plate in which the phosphor is embedded into the silicone small plate. Alternatively, the small plate can be a sintered ceramic small plate in which the phosphor is embedded into the ceramic small plate. Layer transfer is described by way of example in WO2010017831. The high costs and the undesirable lateral emission of primary light, in particular of blue light, are disadvantageous in the case of layer transfer. 
     In layer printing, phosphor is applied to a complete wafer by screen printing. The optoelectronic components are subsequently singulated. Layer printing is by way of example disclosed in DE102006061175. The high costs and the difficult color locus control are disadvantageous in the case of layer printing. 
     Various examples comprise an optoelectronic component comprising a substrate. A semiconductor chip is arranged on the substrate. A sedimented layer composed of phosphor particles is arranged on the semiconductor chip. The semiconductor chip is completely enclosed by a body composed of cured matrix material. The conversion layer completely covers that surface of the semiconductor chip facing away from the substrate. This arrangement is advantageous for a number of reasons. First, as a result of the direct contact between the conversion layer and the semiconductor chip, the heat generated in the conversion layer can be dissipated particularly well to the semiconductor chip. This improves the thermal properties of the optoelectronic component. Second, color homogeneity over the viewing angle is improved. 
     Preferably, the body has concavely curved side faces. 
     Preferably, the body has straight side faces perpendicular to the substrate. 
     Preferably, the conversion layer has a homogeneous thickness. This is advantageous since it is thereby possible to achieve a uniform intensity of wavelength-converted secondary light over the viewing angle. This also results in a white mixed light having a virtually uniform color temperature over all viewing angles. 
     Preferably, the optoelectronic component comprises a lateral potting composed of a second matrix material with scattering particles embedded therein. Silicone can be used as a second matrix material. TiO 2 , particles can be used as scattering particles. This example is advantageous since the primary light and the secondary light that leaves the component in a lateral direction is reflected back into the component. The use of highly viscous silicone as further matrix material is particularly advantageous since the scattering particles are not intended to sediment prior to curing. Additionally or alternatively, the sedimentation speed can be influenced by the size of the scattering particles. The smaller the scattering particles, the more slowly the scattering particles sediment. Additionally or alternatively, the sedimentation can be influenced by immediate curing after potting. 
     Preferably, the semiconductor chip arranged in the optoelectronic component can be based on a III-V compound semiconductor material. GaN and InGaN can be used as material system. The semiconductor chips comprise at least one active zone which emits electromagnetic radiation. The active zones can be pn junctions, double heterostructure, multiquantum well structure (MQW), single quantum well structure (SQW). Quantum well structure means: quantum wells (3-dim), quantum wires (2-dim) and quantum dots (1-dim). 
     The semiconductor chip can be designed as a surface emitter, in particular as a so-called thin-film chip. The thin-film chip is known, for example, from WO2005081319A1. 
     Turning now to the drawings,  FIG. 1  shows a flow chart of two alternative production methods A and B for an optoelectronic component. The production process can be subdivided into steps S 1  to S 4 . Steps S 5 , S 6  and S 7  are optional. 
     In step S 1 , a semiconductor chip  110  is introduced into a first liquid matrix material  112  with phosphor particles  114  distributed homogeneously therein.  FIG. 1  shows two alternative ways SA 1  and SB 1  to embody method step S 1 . 
     The first alternative SA 1  has sub-steps SA 1 . 1 , SA 1 . 2 , SA 1 . 3 , SA 1 . 4  and SA 1 . 5 . 
     In sub-step SA 1 . 1 , an inelastic plate  140  with elastic side walls  142  arranged thereon is provided. The elastic side walls  142  can comprise silicone, fluoroelastomers, ethylene-propylene-diene rubber (EPDM) or a thermoplastic elastomer. The elastic side walls  142  do not comprise any sulphur. The intermediate product associated with sub-step SA 1 . 1  is illustrated in FIG. A 1 . 1 . The elastic side walls  142  terminate tightly with the inelastic plate  140  and thus form a cavity. 
     In sub-step SA 1 . 2 , the cavity composed of inelastic plate  140  and the elastic side walls  142  is filled with a liquid matrix material  112  from a dispenser. A silicone, an epoxy or a hybrid can be provided as matrix material  112 . Phosphor particles  114  can be introduced into the matrix material  112 . Yttrium aluminum garnet or orthosilicates or can be used as phosphor particles  114 . The intermediate product associated with sub-step SA 1 . 2  is illustrated in FIG. A 1 . 2 . The phosphor particles  114  can be distributed homogeneously in the matrix material  112 . Only up to approximately ¾ of the volume of the cavity is filled with the matrix material  112 . 
     In sub-step SA 1 . 3 , a substrate  102  with a semiconductor chip  110  arranged thereon is applied to the elastic side walls  142  of the cavity  103  such that the semiconductor chip  110  faces toward the inelastic plate  140 . The assembled substrate  102  is applied to the cavity in an autoclave or in a vacuum. The semiconductor chip  110  can at least partly dip into the first matrix material  112 . The intermediate product associated with sub-step SA 1 . 3  is illustrated in FIG. A 1 . 3 . The semiconductor chip  110  is connected to the substrate  102  via a semiconductor chip contact layer  104 . The substrate  102  can be a ceramic substrate. A contact pad  108  is provided on the semiconductor chip  110 . A bonding pad  106  is arranged on the substrate  102 . A bonding wire  116  provides the electrical connection of contact pad  108  and bonding pad  106 . A notch  118  can be introduced in the substrate  102 . 
     In sub-step SA 1 . 4 , the volume which is formed by substrate  102 , inelastic plate  140  and the elastic side walls  142  and is filled with the liquid matrix material  112  is compressed. The flexible cavity  103  with the elastic side walls  142  follows the form of the ceramic substrate  102 . The compression also results in compensation of volume fluctuations. Thus, a possible non-uniformity in the substrate, in particular in the form of a notch  118 , can be compensated for. The intermediate product associated with sub-step SA 1 . 4  is illustrated in FIG. A 1 . 4 . The volume formed from elastic side walls  142 , inelastic plate  140  and substrate  102  is completely filled with the matrix material  112 . The phosphor particles  114  are distributed approximately homogeneously. The elastic side walls  142  are deformed by the pressing-on pressure. In particular, the elastic side walls  142  are bulged out in the direction toward the cavity and shortened in the direction perpendicular to the inelastic plate  140 . 
     In sub-step SA 1 . 5 , the dosed unit composed of substrate  102 , inelastic plate  140  and elastic side walls  142  in the compressed state is rotated by 180°. The unit is rotated about an axis lying in the plane formed between semiconductor chip and substrate. The intermediate product associated with sub-step SA 1 . 5  is illustrated in FIG. A 1 . 5 . The matrix material  112  still fills the entire volume of the closed unit. The phosphor particles  114  are still distributed homogeneously in the matrix material  112 . 
     The second alternative SB 1  comprises sub-steps SB 1 . 1 , SB 1 . 2 , SB 1 . 3 . 
     In sub-step SB 1 . 1 , a semiconductor chip  110  is provided on a substrate  102 . The intermediate product associated with sub-step SB 1 . 1  is illustrated in FIG. B 1 . 1 . The semiconductor chip  110  is electrically and mechanically connected to the substrate  102  via the semiconductor chip contact layer  104 . The contact pad  108  on the semiconductor chip  110  is electrically conductively connected to the bonding pad  106  on the substrate via the bonding wire  116 . 
     In sub-step SB 1 . 2 , a cavity  103  is produced by partly elastic, side walls  120  being placed onto the substrate  102 . The intermediate product associated with sub-step SB 1 . 2  is illustrated in FIG. B 1 . 2 . The partly elastic side walls  120  terminate tightly with the substrate  102 . This produces the cavity, which completely accommodates the semiconductor chip  110  with its contact pad  108 , the bonding wire  116  and the bonding pad  106 . 
     In sub-step SB 1 . 3 , the volume formed by substrate  102  and partly elastic side walls  120  is filled with a liquid matrix material  112 . A dispenser  144  is used for this purpose. Phosphor particles  114  are introduced into the first matrix material  112 . The intermediate product associated with sub-step SB 1 . 3  is illustrated, in FIG. B 1 . 3 . The semiconductor chip  110  with its contact pad  108 , the bonding wire  116  and the bonding pad  106  are completely encapsulated in the matrix material  112 . The phosphor particles  114  are distributed approximately homogeneously in the first matrix material  112 . Advantageously, the liquid matrix material  112  can be metered from above. The substrate  102  no longer dips into the liquid matrix material  112 . The unit composed of substrate  102  and partly elastic side walls  120  no longer has to be rotated before the step for sedimentation. The risk of bubble formation is reduced. 
     In step S 2 , the phosphor particles  114  are sedimented. The sedimentation is carried out over 1 h to 12 h at a slightly elevated temperature of between 25° C. and 70° C. The driving force that acts on the phosphor particles  114  can be the gravitational force. Alternatively, the sedimentation can be carried out in a centrifuge. The driving force here is the centrifugal force. A combination of both sedimentation methods can also be employed. The intermediate products associated with step S 2  are illustrated in FIGS. A 2  and B 2 . The phosphor particles  114  are sedimented on that surface of the semiconductor chip  110  which faces away from the substrate  102 , on the regions of the semiconductor chip contact layer  104  which are not covered by the semiconductor chip  110 , on the contact pad  108 , on the bonding pad  106  and on exposed regions of the substrate  102 . A conversion layer  115  is formed. The matrix material  112  adjoining the conversion layer  115  is virtually clear. In other words, between the conversion layer  115  and the interface between air/matrix material  112 , only very few phosphor particles  114  are present in the matrix material  112 . The proportion of phosphor particles is 0.5%-5% percent by weight. 
     In step S 3 , the first matrix material  112  with the conversion layer  115  comprising phosphor particles  114  is cured. First, the first matrix material  112  is initially cured during a time period of 2 min to 15 min. This is followed by post-curing during a time period of 1 h to 4 h. 
     In step S 4 , the side walls  142  or  120  are removed. FIGS. A 3  and B 3  show the intermediate products during the removal of the lateral walls  142  and  120 , respectively. FIG. A 3  shows the intermediate product in the case of elastic side walls  142 . The elastic deformation relaxes as the elastic side walls  142  are lifted off. The elastic side walls  142  lift off in a simple manner from the semiconductor chip  110  encapsulated in the first matrix material  112 . FIG. B 3  shows the intermediate product in the case of partly elastic side walls  120 . The partly elastic side walls  120  can be provided with a non-stick coating, in particular Teflon, thereby facilitating the detachment of the partly elastic side walls  120  from the encapsulated semiconductor chip  110 . 
     Examples of the end product, the optoelectronic component  100  or the optoelectronic component  101 , result after step S 4  has been carried out. The optoelectronic component  100 ,  101 ,  200 ,  201  comprises a substrate  102 , on which a semiconductor chip  110  is arranged. A layer  115  composed of phosphor particles  114  is sedimented on the semiconductor chip. A body  146  composed of cured matrix material  112  completely encloses the semiconductor chip  110 . 
       FIG. 2   a  shows the optoelectronic component  100  resulting from the production method having sub-step SA 1 . The body  146  has concavely curved side faces  148 . 
       FIG. 2   b  shows the optoelectronic component  101  resulting from the production method having sub-step SB 1 . The body  146  has straight side faces  148  that are perpendicular to the substrate  102 . 
       FIG. 2   a  differs from  FIG. 2   b  only in the lateral form of the cured matrix material  112 . Since this lateral form has no influence on the properties of the optoelectronic components  100  and  101 , respectively,  FIG. 2   b  and  FIG. 2   a  are described jointly below. 
     The conversion layer  115  has a concentration of phosphor particles  114  of 20%-95% percent by weight. The phosphor particles  114  of the conversion layer  115  are embedded into a matrix material  112 , in particular into a silicone, into an epoxy or into a hybrid. The conversion layer  115  has a homogeneous thickness of 5 μm-120 μm. 
     In the optional step S 5 , the semiconductor chip  110  completely potted with the matrix material  112  is laterally potted with a further matrix material  130 . The further matrix material  130  can be harder than the matrix material  112 . Scattering particles  132  are distributed homogeneously in the further matrix material  130 .  FIGS. 3   a ,  3   b . 1  and  3   b . 2  show the product after step S 5  has been carried out.  FIG. 3   a  shows a plan view of a product having four optoelectronic components  100 ,  101 . The cured further matrix material  130  is arranged between the optoelectronic components  100 ,  101 .  FIGS. 3   b . 1  and  3   b . 2  show schematic lateral sectional views of the product. The majority of the primary light and of the secondary light emitted by the conversion layer  115  leaves the optoelectronic component  100  and respectively  101  through the substantially clear matrix material  112  on that surface of the semiconductor chip  110  which faces away from the substrate  102 . Laterally emitted mixed light can penetrate into the region with the further, harder matrix material  130 . The scattering particles  132  embedded in the further matrix material  130  can backscatter the mixed light. The backscattered mixed light can at least partly leave the optoelectronic component. 
     In an optional step S 6 , the arrangement having a plurality of potted semiconductor chips  110  as shown in  FIGS. 3   a ,  3   b . 1  and  3   b . 2  can be separated into individual optoelectronic components  200  and  201 , respectively. This can be achieved by a sawing process, in particular laser sawing. The result of step S 6  is shown in  FIG. 3   c . 1  and  FIG. 3   c . 2 .  FIG. 3   c . 1  shows an example of an optoelectronic component  200  which emerges as a result of singulation from the arrangement in  FIG. 3   b .  1 .  FIG. 3   c . 2  shows an example of an optoelectronic component  201  which emerges as a result of singulation from the arrangement in  FIG. 3   b . 2 . 
     In the optional step S 7 , a lens  150  is placed onto the potted semiconductor chip  110 . Step S 7  can directly follow step S 4 , directly follow step S 5  or directly follow step S 6 . The placement of the lens  150  can be effected by overmolding a clear potting material, in particular silicone, onto the potted semiconductor chip  110 . In the example shown in  FIG. 4 , the lens  150  is placed onto the optoelectronic component  200  shown in  FIG. 3   c . 1 . The clear potting material of the lens  150  is harder than the matrix material  112  with which the semiconductor chip  110  is potted. This facilitates handling during the shaping of the lens. The lens  150  overlaps the regions of the further matrix material  130  into which the scattering particles  132  are embedded. This increases the proportion of mixed light which can be gathered by the lens  150 .

Technology Classification (CPC): 7