WO2014111247A1 - Led chips on devices and advanced methods of manufacturing them - Google Patents

Led chips on devices and advanced methods of manufacturing them Download PDF

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Publication number
WO2014111247A1
WO2014111247A1 PCT/EP2014/000063 EP2014000063W WO2014111247A1 WO 2014111247 A1 WO2014111247 A1 WO 2014111247A1 EP 2014000063 W EP2014000063 W EP 2014000063W WO 2014111247 A1 WO2014111247 A1 WO 2014111247A1
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WO
WIPO (PCT)
Prior art keywords
light
solid body
thermally insulating
semiconductor chips
transmissive solid
Prior art date
Application number
PCT/EP2014/000063
Other languages
French (fr)
Inventor
Daniel Muessli
Original Assignee
Daniel Muessli
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Publication of WO2014111247A1 publication Critical patent/WO2014111247A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/64—Heat extraction or cooling elements
    • H01L33/644—Heat extraction or cooling elements in intimate contact or integrated with parts of the device other than the semiconductor body

Definitions

  • the present invention relates generally to LED ⁇ lighting .
  • the present invention relates to LED lighting devices or lamps which are applicable to, for example, substituting conventional lighting devices such as incandescent light bulbs or fluorescent light tubes.
  • LEDs Light-emitting diodes
  • LEDs have a wide range of applications nowadays, for example, indoor or outdoor lighting, backlighting for displays and other sorts of illumination.
  • LEDs provide a more energy-efficient solution and offer a longer lifetime than conventional lighting, as well as less solid waste is generated when lamps need to be replaced less frequently.
  • LED lamps have been welcomed by consumers and had a huge market worldwide. Every business or household desires to cut their electricity bill by converting to LED lighting. The greater the demand becomes, the higher expectation the consumers will have and LED lighting devices with higher and higher efficiency or performance have always been anticipated, for example, with higher power factor, or with longer lifetime, or with more uniform light distribution, or with less materials or cost to build. Summary of the invention;
  • the present invention relates to an LED lighting system, where multiple LED semiconductor chips are sandwiched in a thermally insulating and light-transmissive solid body at the bottom and at the top and are, therefore, heat- insulated from the outer surfaces with a thermal conductivity of less than 3W/mK (is measured in watts per meter kelvin) .
  • At least one outer surface is coated with a converter substance such as phosphor, which at least partially converts the emitted light at a certain wavelength.
  • the converter substance can be a transparent material, for example silicone, to which phosphor powder has been added, or primarily phosphor powder, which has been bound by an appropriate binding agent .
  • the heat dissipation of the outer surfaces of the LED bulb is reduced by the value of the power loss of the thermally insulating and light-transmissive solid body with respect to the heat-producing multiple LED semiconductor chips.
  • the invention of this arrangement is that the multiple LED semiconductor chips maximize the operating temperature in the permissible range and the converter substance such as phosphor is kept to a temperature that is as low as possible .
  • thermally insulating and light - transmissive solid body is intended to direct the light emission of the multiple LED semiconductor chips as unhindered as possible to the outer surface of the LED bulb, which in turn is covered partially or fully with the converter substance, such as phosphor.
  • the emitted energy required for cooling the converter substance is reduced by the value of the power loss, which is caused by the thermally insulating and light- transmissive solid body.
  • the LED semiconductor chips generally an indium gallium nitride (InGaN) semiconductor, which emits a blue light in the 450-470 nm wave range, is largely stable compared to the converter substance phosphor. Therefore, the efficiency of the converter substance is more than 20% lower.
  • InGaN indium gallium nitride
  • the efficiency of the light emission of the multiple LED semiconductor chips is increased, as - in contrast to conventional LED systems - it is able to impinge on said converter substance, which has been favorably thermally insulated, with less resistance.
  • the present invention has the further advantage that in particular the warm light colors, e.g. 2700K can be kept within the normal tolerances for longer.
  • LED systems with warm light colors where the converter substance phosphor comes into direct contact with the LED chip, 'bleach 1 out more quickly as the added red phosphor, which emits in the warm color spectrum of 630 nm , ages faster than the yellow phosphor in the converter substance, which emits in the cooler color spectrum.
  • the heat-emitting surface of the multiple LED semiconductor chips can be placed on a partially applied, heat conductive substrate such as copper or aluminum. This results in a better distribution of the temperature across the layer in said thermally insulating and light - transmissive solid body, which in turn affects the reduction of the junction temperature of the multiple LED semiconductor chips.
  • the outer surfaces of the thermally insulating and light- transmissive solid body can be partially or fully coated with an inward- facing seal in order to deflect any light emission that would otherwise impinge on the converter substance phosphor.
  • the reflective surfaces can be thermally joined with a conventional, outward- facing heat sink.
  • Figure 1 show the schematically perspective illustration of the said LED lighting ⁇ system.
  • the multiple LED semiconductor chips 5 are attached to the top surface 8 of the thermally insulating and light- transmissive solid body 1.
  • connection layer 6 is connect in opposite of the multiple LED semiconductor chips 5 and mechanical fix on the down surface of the thermally insulating and light - transmissive solid body 2.
  • the connection Layer 6 and the multiple LED semiconductor chips are in-between the said sandwiched thermally insulating and light- transmissive solid body.
  • 3 and 4 show the said converter substance on the outer surface of the thermally insulating and light - transmissive solid body 1 and 2.
  • the thickness of the thermally insulating and light- transmissive solid body 1 and 2 is preferred more than 0.8 mm
  • the multiple LED semiconductor chips are, as this drawings show, connected in "Flip Chip” technology.
  • the mounting sequence in this present invention can be as follow: At first the conventionally "Dies Bonding" process with an combined glue process will place the multiple LED semiconductor chips 5 to the substrate, call in this invention the thermally insulating and light- transmissive solid body. Thereby the multiple LED semiconductor chips 5 are glue to the substrate with the opposite face of the top surface 15 shows in Figure 2. There after the solder Bumps 7 Figure 2 are applied to the top 15 of the Chip 14 show in Figure 2. This apply process can be done with a silk print process.
  • the multiple LED semiconductor chips 5 assembled with the thermally insulating and light-transmissive solid body include the solder bump will be reflow soldered together with the electrical connection layer 6 which is in the other hand fix with the upper insulating and light-transmissive solid body.
  • the solder Bumps can also be applied to the electrical connection layer 6 instead of placement to the multiple LED semiconductor chips 5, before the operation reflow soldering process.
  • the multiple LED semiconductor chips 5 can be connected in conventional wire bond technology if the connection layer 6 is in the same layer mechanical fixed as the multiple LED semiconductor chips 5. Therefore are may mechanical distance fixtures needed to protect the Bond wire before the assembly of the two thermally insulating and light-transmissive solid body.
  • Figure 2 show the top surface 15 of the LED chip 14 and is at the same the time the light emitting surface and as well the connection layer on the Chip 14 for the solder bumps 7.
  • 6 shows the connection layer which is connected in opposite to the solder bumps 7.
  • the LED Chip 14 can also have the light emitting surface downward, opposite of the top surface 15 of the LED chip 14.
  • Figure 3 shows in schematically illustration the LED lighting system follow; 1 is the thermally insulating and light-transmissive solid body. 2 is the upper thermally insulating and light- transmissive solid body. 3 is the converter substance. 4 the upper converter substance and is overlay or coated on the top of the upper thermally insulating and light- transmissive solid body 2. 5 the multiple LED semiconductor chips 5 who are mechanical fixed for instant with an transparent glue to the top on the thermally insulating and light- transmissive solid body 1. 7 shows the solder bumps which are connect to the multiple LED semiconductor chips 5 and with the electrical connection layer 6.
  • the transparent Binder 9 a transparent binder and can be a transparent polymers like silicones or any other transparent binder or glue to fix mechanical the upper thermally insulating and light- transmissive solid body 2 and the thermally insulating and light- transmissive solid body 1 together.
  • the transparent binder is filled, preferred under vacuum, the multiple LED semiconductor chips 5 are sealed.
  • the transparent Binder 9 between the two thermally insulating and light - transmissive solid bodies can be blended with a converter substance like phosphor or a nanomaterial to enhance the light quality and or efficiency.
  • Figure 4 shows the same arrangement as Figure 3 , except the thermally insulating and light- transmissive solid body can be a relatively thinner thermally insulating and light- transmissive solid body show as number 11 and is coated with an mirror coating 12 to back bounce the light rays emitting from the multiple LED semiconductor chips 5 to the upper thermally insulating and light- transmissive solid body 2 and further to the upper converter substance 4.
  • the thermally insulating and light- ransmissive solid 11 with the mirror coating 12 can be an ordinary glass mirror.
  • Figure 5 shows the same arrangement as Figure 4 with an additional Heat sink 16 who is thermal connected to the Mirror coating 12 to transport the heat coming from the multiple LED semiconductor chips.
  • the thickness of the said thermally insulating and light-transmissive solid body 11 is preferred more thin, to minimize the thermo Insulations and could have the preferable thickness of 0.3 mm and less.
  • Figure 6 shows in the perspective illustration a sample in open position: the thermally insulating and light- transmissive solid body 1, the upper thermally insulating and light-transmissive solid body 2, the multiple LED semiconductor chips 5, the Electrical connection layer 6 and the main electrical terminal 8.
  • Figure 7 shows in the perspective illustration and in close position: the thermally insulating and light- transmissive solid body 1, the upper thermally insulating and light-transmissive solid body 2, the converter substance 3, the upper converter substance 4, an transparent protection layer 17 to protect the converter substance 3 and an upper transparent protection layer 18 to protect the upper converter substance 4.
  • the whole LED light system can be over coated with a transparent plastic material.
  • the LED system comprising the thermally insulating and light-transmissive solid body 1, the upper thermally insulating and light- transmissive solid body 2 with the sandwiched multiple LED semiconductor chips 5 and the Electrical connection layer 6 shown in figure 6 can be over coated with an transparent plastic material who has embedded the converter substance like phosphors.
  • FIG 8 shows where the thermally insulating and light- transmissive solid body 19 is an large panel with the corresponded electrical connection layer 23 to connected via the said solder bumps with multiple upper thermally insulating and light-transmissive solid bodies 22 who comprising the multiple LED semiconductor chips 5 each.
  • a thermal insulating and light-transmissive solid body are usually limit by the machines to equip larger areas with chips, rather than the thermally insulating and light-transmissive solid body 19 which is show with Number 19.
  • a large thermally insulating and light- transmissive solid body can easy be printed in with the connection layer, preferred in the known thick film technology.
  • a mechanical gab in-between the multiple upper thermally insulating and light-transmissive solid bodies 22 are necessary to fill or apply the said transparent binder .

Abstract

A LED lighting system, where multiple LED semiconductor chips are sandwiched in a thermally insulating and light- transmissive solid body at the bottom and at the top and are, therefore, heat-insulated from the outer surfaces with a thermal resistance of less than 3 W/mK.

Description

LED CHIPS ON DEVICES AND ADVANCED METHODS OF MANUFACTURING THEM
Field of the invention;
The present invention relates generally to LED ■ lighting . In particular, the present invention relates to LED lighting devices or lamps which are applicable to, for example, substituting conventional lighting devices such as incandescent light bulbs or fluorescent light tubes.
Background; LEDs (Light-emitting diodes) have a wide range of applications nowadays, for example, indoor or outdoor lighting, backlighting for displays and other sorts of illumination. For a sustainable development, LEDs provide a more energy-efficient solution and offer a longer lifetime than conventional lighting, as well as less solid waste is generated when lamps need to be replaced less frequently.
Therefore, LED lamps have been welcomed by consumers and had a huge market worldwide. Every business or household desires to cut their electricity bill by converting to LED lighting. The greater the demand becomes, the higher expectation the consumers will have and LED lighting devices with higher and higher efficiency or performance have always been anticipated, for example, with higher power factor, or with longer lifetime, or with more uniform light distribution, or with less materials or cost to build. Summary of the invention;
The present invention relates to an LED lighting system, where multiple LED semiconductor chips are sandwiched in a thermally insulating and light-transmissive solid body at the bottom and at the top and are, therefore, heat- insulated from the outer surfaces with a thermal conductivity of less than 3W/mK (is measured in watts per meter kelvin) .
At least one outer surface is coated with a converter substance such as phosphor, which at least partially converts the emitted light at a certain wavelength. The converter substance can be a transparent material, for example silicone, to which phosphor powder has been added, or primarily phosphor powder, which has been bound by an appropriate binding agent .
Therefore, the heat dissipation of the outer surfaces of the LED bulb is reduced by the value of the power loss of the thermally insulating and light-transmissive solid body with respect to the heat-producing multiple LED semiconductor chips. This means that the emitted energy of the outer surfaces of the LED lighting system is reduced by the factor of the power loss, which accrues in the thermal bridge of the thermally insulating and light- transmissive solid body. The invention of this arrangement is that the multiple LED semiconductor chips maximize the operating temperature in the permissible range and the converter substance such as phosphor is kept to a temperature that is as low as possible . In addition, the thermally insulating and light - transmissive solid body is intended to direct the light emission of the multiple LED semiconductor chips as unhindered as possible to the outer surface of the LED bulb, which in turn is covered partially or fully with the converter substance, such as phosphor.
Furthermore, the emitted energy required for cooling the converter substance is reduced by the value of the power loss, which is caused by the thermally insulating and light- transmissive solid body.
This reduces the expenditure for any additional cooling that may be required, whilst the efficiency of the LED lighting system is substantially increased in this arrangement compared to well-known LED lighting systems that are available on the market.
It goes without saying that an expert will be able to determine the permissible junction temperature of the multiple LED semiconductor chips based on the thermal bridges in the LED lighting system and the convection surfaces. The optimum insulation in the thermally insulating and light- transmissive solid body can be calculated according to the commonly known Fourier ' s Law of heat transfer.
This invention is largely based on the fact that the temperature-dependent influence on the efficiency and the life-time of the light -producing LED semiconductor chip and the converter substance varies greatly. The LED semiconductor chips, generally an indium gallium nitride (InGaN) semiconductor, which emits a blue light in the 450-470 nm wave range, is largely stable compared to the converter substance phosphor. Therefore, the efficiency of the converter substance is more than 20% lower.
At the maximum permissible operating temperatures of the LED semiconductor chips, their efficiency has no significant efficiency losses. In addition, the efficiency of the light emission of the multiple LED semiconductor chips is increased, as - in contrast to conventional LED systems - it is able to impinge on said converter substance, which has been favorably thermally insulated, with less resistance.
Compared to LED systems, where the converter substance phosphor partially comes into direct contact with the LED chip, the present invention has the further advantage that in particular the warm light colors, e.g. 2700K can be kept within the normal tolerances for longer. LED systems with warm light colors, where the converter substance phosphor comes into direct contact with the LED chip, 'bleach1 out more quickly as the added red phosphor, which emits in the warm color spectrum of 630 nm , ages faster than the yellow phosphor in the converter substance, which emits in the cooler color spectrum.
The heat-emitting surface of the multiple LED semiconductor chips can be placed on a partially applied, heat conductive substrate such as copper or aluminum. This results in a better distribution of the temperature across the layer in said thermally insulating and light - transmissive solid body, which in turn affects the reduction of the junction temperature of the multiple LED semiconductor chips. Instead of the converter substance phosphor, the outer surfaces of the thermally insulating and light- transmissive solid body can be partially or fully coated with an inward- facing seal in order to deflect any light emission that would otherwise impinge on the converter substance phosphor. In addition, the reflective surfaces can be thermally joined with a conventional, outward- facing heat sink.
Description of the embodiments:
Figure 1 show the schematically perspective illustration of the said LED lighting ■ system. The multiple LED semiconductor chips 5 are attached to the top surface 8 of the thermally insulating and light- transmissive solid body 1.
The connection layer 6 is connect in opposite of the multiple LED semiconductor chips 5 and mechanical fix on the down surface of the thermally insulating and light - transmissive solid body 2. The connection Layer 6 and the multiple LED semiconductor chips are in-between the said sandwiched thermally insulating and light- transmissive solid body. 3 and 4 show the said converter substance on the outer surface of the thermally insulating and light - transmissive solid body 1 and 2. The thickness of the thermally insulating and light- transmissive solid body 1 and 2 is preferred more than 0.8 mm
The multiple LED semiconductor chips are, as this drawings show, connected in "Flip Chip" technology. The mounting sequence in this present invention can be as follow: At first the conventionally "Dies Bonding" process with an combined glue process will place the multiple LED semiconductor chips 5 to the substrate, call in this invention the thermally insulating and light- transmissive solid body. Thereby the multiple LED semiconductor chips 5 are glue to the substrate with the opposite face of the top surface 15 shows in Figure 2. There after the solder Bumps 7 Figure 2 are applied to the top 15 of the Chip 14 show in Figure 2. This apply process can be done with a silk print process. Thereafter the multiple LED semiconductor chips 5 assembled with the thermally insulating and light-transmissive solid body include the solder bump will be reflow soldered together with the electrical connection layer 6 which is in the other hand fix with the upper insulating and light-transmissive solid body. Alternate, the solder Bumps can also be applied to the electrical connection layer 6 instead of placement to the multiple LED semiconductor chips 5, before the operation reflow soldering process. In another alternative, the multiple LED semiconductor chips 5 can be connected in conventional wire bond technology if the connection layer 6 is in the same layer mechanical fixed as the multiple LED semiconductor chips 5. Therefore are may mechanical distance fixtures needed to protect the Bond wire before the assembly of the two thermally insulating and light-transmissive solid body.
Figure 2 show the top surface 15 of the LED chip 14 and is at the same the time the light emitting surface and as well the connection layer on the Chip 14 for the solder bumps 7. 6 shows the connection layer which is connected in opposite to the solder bumps 7. The LED Chip 14 can also have the light emitting surface downward, opposite of the top surface 15 of the LED chip 14.
Figure 3 shows in schematically illustration the LED lighting system follow; 1 is the thermally insulating and light-transmissive solid body. 2 is the upper thermally insulating and light- transmissive solid body. 3 is the converter substance. 4 the upper converter substance and is overlay or coated on the top of the upper thermally insulating and light- transmissive solid body 2. 5 the multiple LED semiconductor chips 5 who are mechanical fixed for instant with an transparent glue to the top on the thermally insulating and light- transmissive solid body 1. 7 shows the solder bumps which are connect to the multiple LED semiconductor chips 5 and with the electrical connection layer 6. 9 a transparent binder and can be a transparent polymers like silicones or any other transparent binder or glue to fix mechanical the upper thermally insulating and light- transmissive solid body 2 and the thermally insulating and light- transmissive solid body 1 together. At the same time when the transparent binder is filled, preferred under vacuum, the multiple LED semiconductor chips 5 are sealed. The transparent Binder 9 between the two thermally insulating and light - transmissive solid bodies can be blended with a converter substance like phosphor or a nanomaterial to enhance the light quality and or efficiency.
Figure 4 shows the same arrangement as Figure 3 , except the thermally insulating and light- transmissive solid body can be a relatively thinner thermally insulating and light- transmissive solid body show as number 11 and is coated with an mirror coating 12 to back bounce the light rays emitting from the multiple LED semiconductor chips 5 to the upper thermally insulating and light- transmissive solid body 2 and further to the upper converter substance 4. Thus the thermally insulating and light- ransmissive solid 11 with the mirror coating 12 can be an ordinary glass mirror. Figure 5 shows the same arrangement as Figure 4 with an additional Heat sink 16 who is thermal connected to the Mirror coating 12 to transport the heat coming from the multiple LED semiconductor chips. In this application Figure 5 the thickness of the said thermally insulating and light-transmissive solid body 11 is preferred more thin, to minimize the thermo Insulations and could have the preferable thickness of 0.3 mm and less.
Figure 6 shows in the perspective illustration a sample in open position: the thermally insulating and light- transmissive solid body 1, the upper thermally insulating and light-transmissive solid body 2, the multiple LED semiconductor chips 5, the Electrical connection layer 6 and the main electrical terminal 8. Figure 7 shows in the perspective illustration and in close position: the thermally insulating and light- transmissive solid body 1, the upper thermally insulating and light-transmissive solid body 2, the converter substance 3, the upper converter substance 4, an transparent protection layer 17 to protect the converter substance 3 and an upper transparent protection layer 18 to protect the upper converter substance 4.
Instead of the transparent protection layer 18 and 17 the whole LED light system can be over coated with a transparent plastic material. Furthermore the LED system comprising the thermally insulating and light-transmissive solid body 1, the upper thermally insulating and light- transmissive solid body 2 with the sandwiched multiple LED semiconductor chips 5 and the Electrical connection layer 6 shown in figure 6 can be over coated with an transparent plastic material who has embedded the converter substance like phosphors.
Figure 8 shows where the thermally insulating and light- transmissive solid body 19 is an large panel with the corresponded electrical connection layer 23 to connected via the said solder bumps with multiple upper thermally insulating and light-transmissive solid bodies 22 who comprising the multiple LED semiconductor chips 5 each. The known Die bond process to mount multiple LED semiconductor chips 5 to a substrate, in this invention a thermal insulating and light-transmissive solid body, are usually limit by the machines to equip larger areas with chips, rather than the thermally insulating and light-transmissive solid body 19 which is show with Number 19. A large thermally insulating and light- transmissive solid body can easy be printed in with the connection layer, preferred in the known thick film technology. Furthermore to apply an transparent binder shown in figure 3 number 9 in to an large LED unit show in Figure 8, a mechanical gab in-between the multiple upper thermally insulating and light-transmissive solid bodies 22 are necessary to fill or apply the said transparent binder .

Claims

Claims
LED lighting system comprising:
multiple LED semiconductor chips (5) , which are sandwiched in a thermally insulating and light- transmissive solid body (1) at the bottom and at the top and are heat- insulated from outer surfaces with a thermal conductivity of less than 3 W/mK;
at least one outer surface of the thermally insulating and light-transmissive solid body (1) being coated with a converter substance (3) , which at least partially converts the emitted light at a certain wavelength; and the thermally insulating and light-transmissive solid body (1) being intended to direct the light emission of the multiple LED semiconductor chips (5) to the outer surfaces.
LED lighting system as claimed in claim 1, wherein the converter substance (3) is a transparent material, preferably selected from the group of silicone; a mixture of silicone and phosphor powder; and a mixture of phosphor powder and a binding agent .
LED lighting system as claimed in claim 1, wherein the outer surfaces of the thermally insulating and light- transmissive solid body (1) are partially or fully coated with a converter substance phosphor.
LED lighting system as claimed in claim 1, wherein the outer surfaces of the thermally insulating and light- transmissive solid body (1) are partially or fully coated with an inward-facing seal.
LED lighting system as claimed in any one of claims 1 to 4, wherein the multiple LED semiconductor chips (5) are attached to a top surface (8) of the thermally insulating and light-transmissive solid body (1) .
LED lighting system as claimed in claim 5, wherein the multiple LED semiconductor chips (5) are sealed by a transparent binder or glue (9).
LED lighting system as claimed in any one of claims 1 to 6, wherein an electrical connection layer (6) is mechanical fixed on a down surface of the thermally insulating and light-transmissive solid body (1) opposite of the multiple LED semiconductor chips (5) such that the electrical connection layer (6) and the multiple LED semiconductor chips (5) are sandwiched in-between the said thermally insulating and light- transmissive solid body (1) .
LED lighting system as claimed in any one of claims 1 to 7, wherein the thickness of the thermally insulating and light-transmissive solid body (1) is more than 0.8 mm .
LED lighting system as claimed in any one of claims 1 to 8, further comprising an upper thermally insulating and light-transmissive solid body (2) with a top on which an upper converter substance (4) is coated.
LED lighting system as claimed in claim 9, further comprising a transparent protection layer (17) to protect the converter substance (3) and an upper transparent protection layer (18) to protect the upper converter substance (4) .
LED lighting system as claimed in claim 9, wherein the thermally insulating and light-transmissive solid body (1), the upper thermally insulating and light- transmissive solid body (2) with the sandwiched multiple LED semiconductor chips (5) and an electrical connection layer (6) are over coated with an transparent plastic material which has embedded the converter substance (3, 4).
LED lighting system as claimed in claim 9, wherein the thermally insulating and light-transmissive solid body (1) is a body (11), which has a thickness of 0.3 mm or less and is coated with a mirror coating (12) to back bounce the light rays emitting from the multiple LED semiconductor chips (5) to the upper thermally insulating and light-transmissive solid body (2) and further to the upper converter substance (4) .
LED lighting system as claimed in claim 12, wherein further comprising a heat sink (16) which is thermally connected to the mirror coating (12) to transport heat coming from the multiple LED semiconductor chips (5) .
Method for connecting multiple LED semiconductor chips in a LED lighting system, the method comprising the following steps: a) gluing multiple LED semiconductor chips (5) to a thermally insulating and light-transmissive solid body (1) with the opposite face of a top surface (15) of the multiple LED semiconductor chips (5) ; b) applying solder bumps (7) to the top surface (15), preferably with a silk print process; and c) reflow soldering the multiple LED semiconductor chips (5) , which are assembled with the thermally insulating and light- transmissive solid body including the solder bumps (7) , together with an electrical connection layer (6) fixed to an upper insulating and light- transmissive solid body (2) .
Method as claimed in claim 14, wherein in step b) , the solder bumps (7) are applied to an electrical connection layer (6) instead of being applied to the top surface (15) of the multiple LED semiconductor chips (5) .
PCT/EP2014/000063 2013-01-16 2014-01-14 Led chips on devices and advanced methods of manufacturing them WO2014111247A1 (en)

Applications Claiming Priority (2)

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US201361753185P 2013-01-16 2013-01-16
US61/753,185 2013-01-16

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001040702A1 (en) * 1999-12-03 2001-06-07 Cree Lighting Company Solid state lamp
US20100321937A1 (en) * 2008-02-04 2010-12-23 Koninklijke Philips Electronics N.V. Lighting system, light element and display
US20120140435A1 (en) * 2006-03-08 2012-06-07 Intematix Corporation Light emitting device utilizing remote wavelength conversion with improved color characteristics

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001040702A1 (en) * 1999-12-03 2001-06-07 Cree Lighting Company Solid state lamp
US20120140435A1 (en) * 2006-03-08 2012-06-07 Intematix Corporation Light emitting device utilizing remote wavelength conversion with improved color characteristics
US20100321937A1 (en) * 2008-02-04 2010-12-23 Koninklijke Philips Electronics N.V. Lighting system, light element and display

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