WO2001029905A1 - Luminescent diode device - Google Patents

Luminescent diode device Download PDF

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Publication number
WO2001029905A1
WO2001029905A1 PCT/RU1999/000389 RU9900389W WO0129905A1 WO 2001029905 A1 WO2001029905 A1 WO 2001029905A1 RU 9900389 W RU9900389 W RU 9900389W WO 0129905 A1 WO0129905 A1 WO 0129905A1
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WO
WIPO (PCT)
Prior art keywords
luminescent diode
diode device
reflector
light emitter
lens
Prior art date
Application number
PCT/RU1999/000389
Other languages
French (fr)
Inventor
Vladimir Semenovich Abramov
Nikolai Valentinovich Scherbakov
Petr Alexeevich Micheev
Alexandr Eduardovich Puysha
Alexander Valerievich Shishov
Original Assignee
Obschestvo S Ogranichennoi Otvetstvennostiju 'korvet-Lights'
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.)
Filing date
Publication date
Application filed by Obschestvo S Ogranichennoi Otvetstvennostiju 'korvet-Lights' filed Critical Obschestvo S Ogranichennoi Otvetstvennostiju 'korvet-Lights'
Priority to PCT/RU1999/000389 priority Critical patent/WO2001029905A1/en
Priority to AU30848/00A priority patent/AU3084800A/en
Publication of WO2001029905A1 publication Critical patent/WO2001029905A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
    • H01L33/58—Optical field-shaping elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the invention relates to the field of electronic engineering, namely to semiconducting devices containing a few elements executed on the common substrate, and specifically - to luminescent diodes and can find its application in semi-conductor industries in development and manufacture of luminescent diodes used in power engineering, railway traffic, ferrous metallurgy, chemical, heavy and other industries.
  • Luminescent diodes are widely used in signaling about the mode of operation of various devices, in full-coloured screens of public use of any format, in manufacture of such sources of information like information panels, traveling lines, traffic lights, additional signals of braking in automobiles, etc.
  • luminescent diodes instead of incandescent lamps considerably increases the reliability and reduces the power consumption of the equipment. As this takes place, in many cases required are the luminescent diodes with a wide range of colours and shades of light flow, varying in size and uniformity of luminous spot and in emissive power (luminous intensity).
  • the most important parameter of luminescent diodes is the emissive power.
  • the said parameter depends mostly on the strength of flowing forward electrical current and on the value of thermal resistance of the holder on which a crystal of light emitter is installed.
  • One more important parameter is the indicatriss of emission determining the applicability of a luminescent diode in certain equipment.
  • Kingbright-type (Catalogue of the Kingbright company, 1996-97, p. 8), wherein the crystal of light emitter is fixed on the holder connected to one of the electrical outlets and is located in a plastic monolithic corpse which consists of a cylindrical base with a reflector made in the form of a reverse cone with an angle of 90° by the hit intended for obtaining the circular diagram of emission.
  • a plastic monolithic corpse which consists of a cylindrical base with a reflector made in the form of a reverse cone with an angle of 90° by the hit intended for obtaining the circular diagram of emission.
  • the minimal value of luminous intensity axial intensity of luminescence
  • the value of thermal resistance of the crystal-corpse is 240° C/W. The drawback of such device is low luminous intensity.
  • the technical result of the offered invention is increasing of emissive power (luminous intensity) of a luminescent diode and possibility of varying of an angle of vision and of spatial diagram of the emission directionality.
  • the set technical task is solved through that the luminescent diode contains a semi-conducting light emitter placed on the substrate and a reflector placed over the light emitter.
  • the device is equipped with a concentrating lens installed between the light emitter and reflector.
  • the reflector can be made either in the form of flat surface located at an angle towards the optical axis of device, either in the form of a pyramid directed by its top towards the lens, either in the form of second sequence curve solid of revolution surface, directed by its top towards the lens, or in the form of a cone directed by its top towards the lens.
  • the reflector surface is executed in the form of mirror surface.
  • the substrate provides a recess in which the light emitter is installed. As this takes place, the side surface of the substrate recess is executed as light-reflecting.
  • the semi-conducting light emitter contains one or several crystals. The ratio of the depth of the substrate recess to the thickness of crystals makes up (2 - 4): 1. Each crystal is located in a mounting seat the diameter whichof does not exceed the size of diagonal of the corresponding crystal in more than one and a half.
  • the side surface of the recess is executed in the form of solid of revolution surface, for example, in the form of conical surface with the lens being made in the form of raster.
  • FIG. 2 Shown in Figure 2 is the view of the luminescent diode device from below.
  • the offered luminescent diode device contains a substrate (1) with the recess (2) and a side surface (3) reflecting emission.
  • the semi-conducting light emitter (4) is installed in the recess (2).
  • the device contains a concentrating lens (5) and a reflector (6). Meanwhile the reflector (6) is executed in the form of flat surface placed at an angle towards an optical axis of the device, or in the form of the reverse cone or in the form of the solid of revolution formed by the curve of second sequence, and the concentrating lens is placed between the reflector (6) and the semi-conducting light emitter (4).
  • the reflector (6) has the mirror surface.
  • the ratio of the depth of the substrate recess (2) to the thickness of the crystal of the semi-conducting light emitter (4) makes up (2 - 4): 1.
  • Each crystal is installed in a mounting seat the diameter whichof exceeds the size of diagonal of the lower face of the corresponding crystal but not more than in one and a half.
  • the side surface (3) of the recess (2) is executed in the form of solid of revolution surface (conical surface) and the lens can be made in the form of raster.
  • the device contains the connecting outlets (8).
  • the work of the luminescent diode device can be described as follows.
  • the electrical voltage which ensures the flow of forward current through the crystal (7) of the semi-conducting light emitter (5) is supplied to the connecting outlets (8), the crystal (3) begins to emit light.
  • the emission from the upper surface of the crystal (7) of the light emitter (5) and from its lateral faces after reflecting by the side surface (3) of the recess (2) falls on a layer of polymeric sealing compound (hermetic) (9) and after that, on the optical system comprising the concentrating lens (5) and the conical reflector (6) forming the emission of required indicatriss.
  • the corresponding configuration of lens is applied.
  • the polymeric sealing compound (hermetic) (9) ensures the protection of the crystals (7) of the light emitter (5) and the junctions of the conductor (8) to the crystal as well as the junctions of the said conductor to the outlet (1 1 ) from penetration of humidity.
  • the offered construction of the luminescent diode device ensures the use of the lateral luminescence of the crystals of the light emitters (3) and to increase the emission intensity (2 times).
  • a metallic substrate (1) having a thickness equal to or exceeding four thicknesses of the crystal (7) of the light emitter (4) ensures effective scattering of consumed power from lower face of substrate.
  • the crystals (7) of light emitters (4) with red, orange, yellow, green, blue and dark blue colours of luminescence may be used in monochromatic version of the luminescent diode.
  • the construction of concrete luminescent diode device made in accordance with the present invention contains a metallic-glass holder of steel 1 mm thick, with connected thereto outlets 0,55 mm in diameter. Reflecting truncated conical surface has a depth of 0,6 mm, diameter on the substrate surface is equal to 2,4 mm, diameter of the flat bottom equipped with mounting seats for crystals is 1 ,5 mm.
  • the cover is cast in plastic mass - polycarbonate of «Lexan» type.
  • the radius of a semi-spherical lens is equal to 2, 5 mm, the height of cylindrical base is 8 mm, the distance between a substrate and base is varied within the limits of 1-3 mm.
  • a sealing (polymeric) compound of 159-322 make is used.
  • Described construction of luminescent diode device ensures thermal resistance to be 170° C/W and increasing of the forward current, flowing through the luminescent diode, up to 80 mA without losses of linearity of lux-ampere characteristic. This makes possible to obtain luminous intensity more than 1.5 Cd at carbon temperature 20°.
  • the said devices contain at three light emitter crystals each (of red, green and dark blue colours) mounted under the common optical dome in hermetic plastic corpse with a square base and plastic cover (10).
  • Examples of concrete execution of the offered luminescent diode device may be illustrated by values set forth in Table 1 and Table 2. Shown in Table 1 are properties/characteristics of bright full-coloured luminescent diodes.
  • Table 2 Shown in Table 2 are maximum operating properties/characteristics and other properties of semi-conducting luminescent diodes. Table 2.
  • the developed luminescent diode device can find its wide industrial application.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Led Device Packages (AREA)

Abstract

The invention falls within the realms of electronic engineering specifically of the luminescent diode devices and is intended for application in semi-conductor industries. The technical result of the offered invention is increasing of emissive power (luminous intensity) of the luminescent diode with possibility of varying of an angle of vision and of the spatial diagram of the emission directionally. The technical result is achieved by that luminescent diode device contains a semi-conducting light emitter located in a recess of a substrate and a reflector located over the light emitter. Furthermore, the device contains a concentrating lens placed between the reflector and light emitter.

Description

LUMINESCENT DIODE DEVICE.
The invention relates to the field of electronic engineering, namely to semiconducting devices containing a few elements executed on the common substrate, and specifically - to luminescent diodes and can find its application in semi-conductor industries in development and manufacture of luminescent diodes used in power engineering, railway traffic, ferrous metallurgy, chemical, heavy and other industries.
Luminescent diodes are widely used in signaling about the mode of operation of various devices, in full-coloured screens of public use of any format, in manufacture of such sources of information like information panels, traveling lines, traffic lights, additional signals of braking in automobiles, etc.
The use of luminescent diodes instead of incandescent lamps considerably increases the reliability and reduces the power consumption of the equipment. As this takes place, in many cases required are the luminescent diodes with a wide range of colours and shades of light flow, varying in size and uniformity of luminous spot and in emissive power (luminous intensity).
The most important parameter of luminescent diodes is the emissive power. The said parameter depends mostly on the strength of flowing forward electrical current and on the value of thermal resistance of the holder on which a crystal of light emitter is installed. One more important parameter is the indicatriss of emission determining the applicability of a luminescent diode in certain equipment.
Known is the luminescent diode with red colour of luminescence of the L-493
Kingbright-type (Catalogue of the Kingbright company, 1996-97, p. 8), wherein the crystal of light emitter is fixed on the holder connected to one of the electrical outlets and is located in a plastic monolithic corpse which consists of a cylindrical base with a reflector made in the form of a reverse cone with an angle of 90° by the hit intended for obtaining the circular diagram of emission. At the forward current value 20 mA the minimal value of luminous intensity (axial intensity of luminescence) is 0 Cd at half power of emission. The value of thermal resistance of the crystal-corpse is 240° C/W. The drawback of such device is low luminous intensity. This is determined by wide diagram of directionality and incomplete concentration of emission directed to the reflector of crystals emission as well as impossibility of increasing of the value of strength of forward current flowing through the device due to considerable resistance of the corpse and overheating of the crystal of light emitter since the isolated heat is led out only through a metallic outlet. In this case the destroying of lumen-ampere characteristics can be revealed which leads to saturation of the luminescence intensity increasing with parallel increasing of the forward current strength.
The technical result of the offered invention is increasing of emissive power (luminous intensity) of a luminescent diode and possibility of varying of an angle of vision and of spatial diagram of the emission directionality. The set technical task is solved through that the luminescent diode contains a semi-conducting light emitter placed on the substrate and a reflector placed over the light emitter. Furthermore, the device is equipped with a concentrating lens installed between the light emitter and reflector. The reflector can be made either in the form of flat surface located at an angle towards the optical axis of device, either in the form of a pyramid directed by its top towards the lens, either in the form of second sequence curve solid of revolution surface, directed by its top towards the lens, or in the form of a cone directed by its top towards the lens. The reflector surface is executed in the form of mirror surface. The substrate provides a recess in which the light emitter is installed. As this takes place, the side surface of the substrate recess is executed as light-reflecting. The semi-conducting light emitter contains one or several crystals. The ratio of the depth of the substrate recess to the thickness of crystals makes up (2 - 4): 1. Each crystal is located in a mounting seat the diameter whichof does not exceed the size of diagonal of the corresponding crystal in more than one and a half. The side surface of the recess is executed in the form of solid of revolution surface, for example, in the form of conical surface with the lens being made in the form of raster.
Shown in Figure 1 is the offered luminescent diode in section.
Shown in Figure 2 is the view of the luminescent diode device from below.
The offered luminescent diode device contains a substrate (1) with the recess (2) and a side surface (3) reflecting emission. The semi-conducting light emitter (4) is installed in the recess (2). The device contains a concentrating lens (5) and a reflector (6). Meanwhile the reflector (6) is executed in the form of flat surface placed at an angle towards an optical axis of the device, or in the form of the reverse cone or in the form of the solid of revolution formed by the curve of second sequence, and the concentrating lens is placed between the reflector (6) and the semi-conducting light emitter (4).
The reflector (6) has the mirror surface. The ratio of the depth of the substrate recess (2) to the thickness of the crystal of the semi-conducting light emitter (4) makes up (2 - 4): 1. Each crystal is installed in a mounting seat the diameter whichof exceeds the size of diagonal of the lower face of the corresponding crystal but not more than in one and a half. The side surface (3) of the recess (2) is executed in the form of solid of revolution surface (conical surface) and the lens can be made in the form of raster. The device contains the connecting outlets (8).
The work of the luminescent diode device can be described as follows. When the electrical voltage which ensures the flow of forward current through the crystal (7) of the semi-conducting light emitter (5) is supplied to the connecting outlets (8), the crystal (3) begins to emit light. The emission from the upper surface of the crystal (7) of the light emitter (5) and from its lateral faces after reflecting by the side surface (3) of the recess (2) falls on a layer of polymeric sealing compound (hermetic) (9) and after that, on the optical system comprising the concentrating lens (5) and the conical reflector (6) forming the emission of required indicatriss.
Depending on the required diagram of directionality of emission the corresponding configuration of lens is applied. Availability of polymeric sealing compound (hermetic) (9) and also of cylindrical base (10) of the lens (6) having a thickness which does not exceed the radius of the lens (5), ensures reduction of emission intensity losses and also the required diagram of emission directionality. Furthermore, the polymeric sealing compound (hermetic) (9) ensures the protection of the crystals (7) of the light emitter (5) and the junctions of the conductor (8) to the crystal as well as the junctions of the said conductor to the outlet (1 1 ) from penetration of humidity. The offered construction of the luminescent diode device ensures the use of the lateral luminescence of the crystals of the light emitters (3) and to increase the emission intensity (2 times). A metallic substrate (1) having a thickness equal to or exceeding four thicknesses of the crystal (7) of the light emitter (4) ensures effective scattering of consumed power from lower face of substrate.
The crystals (7) of light emitters (4) with red, orange, yellow, green, blue and dark blue colours of luminescence may be used in monochromatic version of the luminescent diode.
The construction of concrete luminescent diode device made in accordance with the present invention contains a metallic-glass holder of steel 1 mm thick, with connected thereto outlets 0,55 mm in diameter. Reflecting truncated conical surface has a depth of 0,6 mm, diameter on the substrate surface is equal to 2,4 mm, diameter of the flat bottom equipped with mounting seats for crystals is 1 ,5 mm. The cover is cast in plastic mass - polycarbonate of «Lexan» type. The radius of a semi-spherical lens is equal to 2, 5 mm, the height of cylindrical base is 8 mm, the distance between a substrate and base is varied within the limits of 1-3 mm. A sealing (polymeric) compound of 159-322 make is used.
Crystals emitting red light with wave 633 nm in length, green light with wave
525 nm in length and dark blue light with wave 470 nm in length serve as crystals of light emitter. To install the crystals of light emitter and to coat the junctions of conductors to the isolated connecting outlets based on silver, a current- transmitting glue of TOK-2 is applied.
Described construction of luminescent diode device ensures thermal resistance to be 170° C/W and increasing of the forward current, flowing through the luminescent diode, up to 80 mA without losses of linearity of lux-ampere characteristic. This makes possible to obtain luminous intensity more than 1.5 Cd at carbon temperature 20°.
Shown below are the properties/characteristics of super-bright full-coloured luminescent diodes developed on the base of the present invention.
The said devices contain at three light emitter crystals each (of red, green and dark blue colours) mounted under the common optical dome in hermetic plastic corpse with a square base and plastic cover (10).
Examples of concrete execution of the offered luminescent diode device may be illustrated by values set forth in Table 1 and Table 2. Shown in Table 1 are properties/characteristics of bright full-coloured luminescent diodes.
Table 1.
Figure imgf000007_0001
Shown in Table 2 are maximum operating properties/characteristics and other properties of semi-conducting luminescent diodes. Table 2.
Ns Maximum parameters at 25°C
1. Maximum limit forward current 300 mA
2. Average forward current 60 mA
3. Maximum forward current 70 mA
4. Dispersed intensity 300 mW
5. Reverse voltage (at reverse current=100 mkA) 5 V
6. Operating temperature -55 up to + 100°C
7. Temperature of casting by lead solder 260°C in 5 seconds
As one can conduct from the detailed specification of the invention the developed luminescent diode device can find its wide industrial application.

Claims

CLA I MS
1. The luminescent diode device containing a semi-conducting light emitter located on a substrate and a reflector located over the light emitter, wherein the device is equipped with a concentrating lens installed between the light emitter and reflector.
2. The luminescent diode device as defined in Claim 1 , wherein the surface of reflector is executed as flat surface.
3. The luminescent diode device as defined in Claim 1 , wherein the surface of reflector is located at an angle towards the optical axis of the device.
4. The luminescent diode device as defined in Claim 1 , wherein the reflector is made in the form of a pyramid directed by its top towards the lens.
5. The luminescent diode device as defined in Claim 1 , wherein the reflector is made in the form of second sequence curve solid of revolution surface directed by its top towards the lens.
6. The luminescent diode device as defined in Claim 1 , wherein the reflector is made in the form of a cone directed by its top towards the lens.
7. The luminescent diode device as defined in Claim 1 , wherein the reflector surface is made in the form of mirror.
8. The luminescent diode device as defined in Claim 1 , wherein the substrate provides a recess in which the light emitter is installed.
9. The luminescent diode device as defined in Claim 1 , wherein the side surface of the substrate recess is made as reflecting surface.
10. The luminescent diode device as defined in Claim 1 , wherein the semi- conducting light emitter contains one or a few crystals.
11. The luminescent diode device as defined in Claim 1 , wherein the ratio of the substrate recess depth to the thickness of crystals is (2 - 4): 1.
12. The luminescent diode device as defined in Claim 1 , wherein each crystal is placed in a mounting seat the diameter whichof does not exceed the size of diagonal of the lower face of a corresponding crystal in more than one and a half.
13. The luminescent diode device as defined in Claim 1 , wherein the side surface of the recess is made in the form of solid of revolution surface .
14. The luminescent diode device as defined in Claims 1 , 5, wherein the side surface of the substrate recess is made in the form of conical sur ace.
15. The luminescent diode device as defined in Claim 1 , wherein the lens is made in the form of a raster.
PCT/RU1999/000389 1999-10-18 1999-10-18 Luminescent diode device WO2001029905A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/RU1999/000389 WO2001029905A1 (en) 1999-10-18 1999-10-18 Luminescent diode device
AU30848/00A AU3084800A (en) 1999-10-18 1999-10-18 Luminescent diode device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU1999/000389 WO2001029905A1 (en) 1999-10-18 1999-10-18 Luminescent diode device

Publications (1)

Publication Number Publication Date
WO2001029905A1 true WO2001029905A1 (en) 2001-04-26

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19535777A1 (en) * 1995-09-26 1997-03-27 Siemens Ag Optoelectronic semiconductor component and method for producing it
EP0836234A2 (en) * 1996-10-12 1998-04-15 Preh-Werke GmbH & Co. KG Optoelectronic element
RU2114492C1 (en) * 1996-03-19 1998-06-27 Владимир Семенович Абрамов Light-emitting diode
RU2133068C1 (en) * 1997-07-30 1999-07-10 Абрамов Владимир Семенович Light-emitting diode unit
RU2134000C1 (en) * 1997-12-31 1999-07-27 Абрамов Владимир Семенович Light-emitting diode unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19535777A1 (en) * 1995-09-26 1997-03-27 Siemens Ag Optoelectronic semiconductor component and method for producing it
RU2114492C1 (en) * 1996-03-19 1998-06-27 Владимир Семенович Абрамов Light-emitting diode
EP0836234A2 (en) * 1996-10-12 1998-04-15 Preh-Werke GmbH & Co. KG Optoelectronic element
RU2133068C1 (en) * 1997-07-30 1999-07-10 Абрамов Владимир Семенович Light-emitting diode unit
RU2134000C1 (en) * 1997-12-31 1999-07-27 Абрамов Владимир Семенович Light-emitting diode unit

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