EP0581232A1 - Elektrolumineszente Vorrichtung - Google Patents

Elektrolumineszente Vorrichtung Download PDF

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Publication number
EP0581232A1
EP0581232A1 EP93111947A EP93111947A EP0581232A1 EP 0581232 A1 EP0581232 A1 EP 0581232A1 EP 93111947 A EP93111947 A EP 93111947A EP 93111947 A EP93111947 A EP 93111947A EP 0581232 A1 EP0581232 A1 EP 0581232A1
Authority
EP
European Patent Office
Prior art keywords
light
luminescence
emitting surface
converter filter
transparent resin
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP93111947A
Other languages
English (en)
French (fr)
Inventor
Yohzow Nishiguchi
Kiju Mori
Youichiro Akanuma
Toshimasa Matsumoto
Sumihisa Furufuji
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stanley Electric Co Ltd
Original Assignee
Stanley Electric Co Ltd
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 Stanley Electric Co Ltd filed Critical Stanley Electric Co Ltd
Publication of EP0581232A1 publication Critical patent/EP0581232A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H05B33/145—Arrangements of the electroluminescent material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces

Definitions

  • the present invention relates to an electroluminescent device and more particularly to an electroluminescent device in which a light-emitting surface side includes a chromatic light converter filter to produce a light of a desired color.
  • FIG.3 Shows a first prior-art electroluminescent (EL) panel 90 without chromatic light converter filter.
  • the EL panel 90 comprises a back electrode 91, a transparent electrode 92 disposed in parallel to the back electrode 91, a luminescent layer 93 sandwiched therebetween.
  • the luminescent layer 93 is made of phosphor 93a and an organic fluorescent pigment 93b mixed with the phosphor 93a.
  • FIG.4 shows a second prior-art EL panel 80 for eliminating the above-described drawbacks in the EL panel 90.
  • the EL panel 80 comprises a back electrode 81, a transparent electrode 82 disposed in parallel to the back electrode 81, a luminescent layer 83 made of only phosphor 83a, and a chromatic light converter filter 84 attached to the light-emitting surface of the EL panel 80.
  • the chromatic light converter filter 84 comprises a film 84a of a transparent resin, e.g., polyethylene terephthalate, a film 84b of an organic fluorescent pigment applied by printing or the like to the inner surface of the transparent film 84a, an ultraviolet cut film 84c attached to the outer surface of the transparent film 84a.
  • the second prior-art EL panel 80 increases the luminous efficacy and life of the organic fluorescent pigment 84b.
  • the ultraviolet cut film 84c secures at most only a 200-day (about 7-month) service life of the EL panel 80 in an outdoor exposure test. This means the EL panel 80 commercially cannot be used outdoors.
  • An object of the present invention is to provide an EL device which increases life of an organic fluorescent pigment to increase service life of the EL device.
  • a first aspect of the present invention is an electroluminescent device having a light-emitting surface, comprising a layer of phosphor capable of producing a luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence.
  • the chromatic light converter filter is provided on a light-emitting surface side of the electroluminescent device and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
  • a second aspect of the present invention is an electroluminescent panel, comprising a panel-shaped casing having a transparent flat portion the exterior surface of which constitutes a light-emitting surface of the electroluminescent panel, a layer of phosphor housed in said casing, the layer of phosphor being capable of producing luminescence and directing the luminescence to the light-emitting surface when the layer of phosphor is excited by a voltage, and a chromatic light converter filter converting the luminescence into a light of a color different from the color of the luminescence.
  • the chromatic light converter filter is attached to the light-emitting surface and comprises a film made of a transparent resin and of the organic fluorescent pigment mixed with the transparent resin.
  • the transparent resin seals particles of the organic fluorescent pigment from outside air to protect the organic fluorescent pigment from deterioration due to ultraviolet radiation to increase life or durability of the organic fluorescent pigment.
  • the inventive EL device commercially can be used outdoors.
  • An EL panel 1 according to an embodiment of the present invention comprises a back electrode 2, a transparent electrode 3 disposed in parallel to the back electrode 2, a luminescent layer 4 sandwiched therebetween and made of only phosphor 4a, and a chromatic converter filter 5 attached to the light-emitting surface of the EL panel 1 for converting luminescence from the luminescent layer 4 to white light.
  • the chromatic converter filter 5 comprises a film or lamination in which an organic fluorescent pigment 5b of a relatively high transparency is blended with or uniformly scattered in a matrix 5a of a transparent resin, e.g., acrylic resin.
  • a transparent resin e.g., acrylic resin.
  • the EL panel 1 further comprises an insulating layer 6 and a moistureproof casing film 7.
  • the insulating layer 6 is sandwiched between the luminescent layer 4 and the back electrode 2 to prevent a short circuit between the back electrode 2 and the transparent electrode 3.
  • the casing film 7 protects the fluorescent layer 4 from a deterioration due to moisture. Both of the insulating film 6 and the casing film 7 are produced in a conventional manner. Since the organic fluorescent pigment 5b is blended with the transparent resin 5a, the transparent resin 5a seals particles of the organic fluorescent pigment 5b from outside air to increase life or durability of the organic fluorescent pigment 5b.
  • FIG.2 is a graph indicative of a result of sunlight exposure test of the EL panel 1.
  • FIG.2 further shows results of sunlight exposure test of the prior-art EL panels of FIGS.3 and 4 for comparison.
  • the solid line F represents the result of sunlight exposure test of the inventive EL panel.
  • the dotted line S represents the result of sunlight exposure test of the Prior-art EL panel of FIG.3.
  • the dashed line M represents the result of sunlight exposure test of the prior-art EL panel of FIG.4.
  • the X-values of chromaticity coordinates Y xy of emitted lights from all of the inventive EL panel and the prior-art EL panels of FIGS.3 and 4 are measured. The fading of the emitted lights from all of them wee confirmed.
  • Y-axis represents x-values of chromaticity coordinate Y xy .
  • X-axis represents test days.
  • the x-value of chromaticity coordinates Y xy of the prior-art EL panel of FIG.4 is lowered under the bottom value 200 days and a fraction after start of the test.
  • the x-value of chromaticity coordinates Y xy of the inventive EL panel maintains a level at which the emitted light is recognizable as white light, even 500 days after start of the test.
  • the organic fluorescent pigment 5b of the chromatic light converter filter 5 converts phosphorescence of the phosphor 4a into white light.
  • the present invention is also applicable to a conversion of the phosphorescence into color visible light other than white light.
EP93111947A 1992-07-29 1993-07-26 Elektrolumineszente Vorrichtung Withdrawn EP0581232A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP058415U JPH0623195U (ja) 1992-07-29 1992-07-29 Ｅｌ発光素子
JP58415/92U 1992-07-29

Publications (1)

Publication Number Publication Date
EP0581232A1 true EP0581232A1 (de) 1994-02-02

Family

ID=13083752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93111947A Withdrawn EP0581232A1 (de) 1992-07-29 1993-07-26 Elektrolumineszente Vorrichtung

Country Status (4)

Country Link
EP (1) EP0581232A1 (de)
JP (1) JPH0623195U (de)
KR (1) KR100228515B1 (de)
CN (1) CN1084690A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691798A3 (de) * 1994-07-05 1996-07-17 Ford Motor Co Fluoreszente elektrolumineszente Lampe
US5813752A (en) * 1997-05-27 1998-09-29 Philips Electronics North America Corporation UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters
US5813753A (en) * 1997-05-27 1998-09-29 Philips Electronics North America Corporation UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light
GB2349978A (en) * 1998-07-06 2000-11-15 Huang Fu Kuo A light emitting device
GB2406900A (en) * 2003-09-25 2005-04-13 Koito Mfg Co Ltd Vehicle indicator lamp with LED and filter
EP2267801A1 (de) * 1996-06-26 2010-12-29 OSRAM Opto Semiconductors GmbH Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
US8071996B2 (en) 1996-09-20 2011-12-06 Osram Gmbh Wavelength-converting casting composition and light-emitting semiconductor component
US10488709B2 (en) 2014-06-25 2019-11-26 Samsung Display Co., Ltd. Fluorescent sheet and light unit and liquid crystal display including the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101336022A (zh) * 2002-02-12 2008-12-31 出光兴产株式会社 有机el显示装置及其制造方法
DE102004031071B4 (de) 2004-06-22 2008-04-30 Samsung SDI Co., Ltd., Suwon Verfahren zur Behandlung einer organischen Leuchtdiode (OLED) zur Verlängerung der Lebensdauer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323217A1 (de) * 1987-12-31 1989-07-05 Loctite Luminescent Systems, Inc. Infrarot emittierende Elektrolumineszenz-Lampenstrukturen
EP0387715A2 (de) * 1989-03-15 1990-09-19 Idemitsu Kosan Company Limited Elektrolumineszentes Element
JPH0314540A (ja) * 1988-06-20 1991-01-23 Mitsubishi Kasei Corp Ｅｌ素子

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2079261C (en) * 1991-11-25 1999-04-13 Delmar R. Riffe Co-rotational scroll compressor supercharger device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0323217A1 (de) * 1987-12-31 1989-07-05 Loctite Luminescent Systems, Inc. Infrarot emittierende Elektrolumineszenz-Lampenstrukturen
JPH0314540A (ja) * 1988-06-20 1991-01-23 Mitsubishi Kasei Corp Ｅｌ素子
EP0387715A2 (de) * 1989-03-15 1990-09-19 Idemitsu Kosan Company Limited Elektrolumineszentes Element

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9110, Derwent World Patents Index; Class A85, AN 91-067947 *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5586879A (en) * 1994-07-05 1996-12-24 Ford Motor Company Fluorescent electroluminescent lamp
EP0691798A3 (de) * 1994-07-05 1996-07-17 Ford Motor Co Fluoreszente elektrolumineszente Lampe
EP2267801A1 (de) * 1996-06-26 2010-12-29 OSRAM Opto Semiconductors GmbH Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
US9196800B2 (en) 1996-06-26 2015-11-24 Osram Gmbh Light-radiating semiconductor component with a luminescence conversion element
EP2284912A1 (de) * 1996-06-26 2011-02-16 OSRAM Opto Semiconductors GmbH Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
EP2270877A1 (de) * 1996-06-26 2011-01-05 OSRAM Opto Semiconductors GmbH Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
EP2270876A1 (de) * 1996-06-26 2011-01-05 OSRAM Opto Semiconductors GmbH Licht abstrahlendes Halbleiterbauelement mit Lumineszenzkonversionselement
US8071996B2 (en) 1996-09-20 2011-12-06 Osram Gmbh Wavelength-converting casting composition and light-emitting semiconductor component
WO1998054930A2 (en) * 1997-05-27 1998-12-03 Koninklijke Philips Electronics N.V. Uv/blue led-phosphor device with enhanced light output
WO1998054930A3 (en) * 1997-05-27 1999-04-08 Koninkl Philips Electronics Nv Uv/blue led-phosphor device with enhanced light output
US5813753A (en) * 1997-05-27 1998-09-29 Philips Electronics North America Corporation UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light
US5813752A (en) * 1997-05-27 1998-09-29 Philips Electronics North America Corporation UV/blue LED-phosphor device with short wave pass, long wave pass band pass and peroit filters
GB2349978A (en) * 1998-07-06 2000-11-15 Huang Fu Kuo A light emitting device
GB2406900B (en) * 2003-09-25 2007-09-12 Koito Mfg Co Ltd Vehicular lamp
US7168834B2 (en) 2003-09-25 2007-01-30 Koito Manufacturing Co., Ltd. Vehicular lamp
GB2406900A (en) * 2003-09-25 2005-04-13 Koito Mfg Co Ltd Vehicle indicator lamp with LED and filter
US10488709B2 (en) 2014-06-25 2019-11-26 Samsung Display Co., Ltd. Fluorescent sheet and light unit and liquid crystal display including the same

Also Published As

Publication number Publication date
KR100228515B1 (ko) 1999-11-01
JPH0623195U (ja) 1994-03-25
CN1084690A (zh) 1994-03-30
KR940003423A (ko) 1994-02-21

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