EP1187167B1 - Panneau d'affichage à couleurs avec couche luminescente bleue - Google Patents

Panneau d'affichage à couleurs avec couche luminescente bleue

Info

Publication number
EP1187167B1
EP1187167B1 EP01000410A EP01000410A EP1187167B1 EP 1187167 B1 EP1187167 B1 EP 1187167B1 EP 01000410 A EP01000410 A EP 01000410A EP 01000410 A EP01000410 A EP 01000410A EP 1187167 B1 EP1187167 B1 EP 1187167B1
Authority
EP
European Patent Office
Prior art keywords
phosphor
blue
color
layer
color picture
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.)
Expired - Lifetime
Application number
EP01000410A
Other languages
German (de)
English (en)
Other versions
EP1187167A1 (fr
Inventor
Helmut Dr. Bechtel
Wolfgang Busselt
Thomas Dr. Jüstel
Martin Weibrecht
Peter Quadflieg
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
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 Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Publication of EP1187167A1 publication Critical patent/EP1187167A1/fr
Application granted granted Critical
Publication of EP1187167B1 publication Critical patent/EP1187167B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/42—Fluorescent layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
    • H01J29/26—Luminescent screens with superimposed luminescent layers

Definitions

  • the invention relates to a color screen, in particular a plasma screen, equipped with a blue phosphor layer.
  • the representation of the different colors is determined by so-called standard color curves.
  • a common standard is the CIE color triangle.
  • the range of representable colors in a screen is defined by the color points of the three phosphors, given by the respective emission spectrum.
  • the blue light emission contributes at least to the luminance (brightness) of a screen.
  • US-5866977 discloses a color screen having a blue phosphor layer comprising two different blue-emitting phosphors.
  • US Pat. No. 5,277,841 describes a mixed blue-emitting phosphor composed of a mixture of ZnS: Ag, Al with at least one green-emitting phosphor selected from the group consisting of Y 3 (Al, Ga) 5 O 12 : Tb, Y 2 SiO 5 Tb and LaOCl: Tb, which increases the luminance and the luminance-saturation characteristic.
  • the blue-emitting phosphors are not as efficient as the green and red-emitting phosphors. These two effects lead that the color temperature for white light for television applications is lower than desired.
  • a color screen equipped with a blue phosphor layer comprising a first blue-emitting phosphor having a light emission in the range of 430 to 490 nm, and a second phosphor emitting a deep-violet light emission in the region of 380 to 450 nm contains.
  • the second phosphor has a light emission in the range of 380 to 420 nm.
  • the second phosphor is paid out from the group of Tb 3+ -activated phosphors, the Eu 2+ -activated phosphors, the Bi 3+ -activated phosphors, the Ga 3+ -activated phosphors and the Ce 3+ -activated phosphors.
  • the second phosphor is selected from the group LaOBr: Tb, Y 2 O 2 S: Tb, Y 3 Al 5 O 12 : Tb, Ca 3 (PO 4 ) 2 : Eu, Sr 2 P 2 O 7 : Eu, (Sr, Mg) 2 P 2 O 7 : Eu CaB 2 P 2 O 9 : Eu, CaSO 4 : Eu, CaO: Bi, ZnO: Ga and (Y, Gd) BO 3 : Ce.
  • All these phosphors emit efficiently under UV light excitation or by excitation with an electron beam light with a wavelength between 380 and 450 nm.
  • the phosphor layer contains a physical mixture of particles of the first phosphor and particles of the second phosphor.
  • the proportion of second phosphor in the phosphor layer is between 5 and 50% by weight, based on the amount of the first phosphor.
  • This embodiment is easy to realize because the second phosphor can be easily added to the suspension of the phosphor with which the phosphor layer is made.
  • the phosphor layer comprises a base layer of the first Has phosphor and a cover layer of the second phosphor. It is preferable that the first phosphor is selected from ZnS: Ag, BaMgAl 10 O 17 : Eu and (Ba, Sr, Ca) 5 (PO 4 ) 3 Cl: Eu
  • the ZnS: Ag phosphor is particularly well suited as a blue-emitting phosphor in color cathode ray tubes because it efficiently emits blue light under electron beam excitation.
  • the blue-emitting phosphors BaMgAl 10 O 17 : Eu and (Ba, Sr, Ca) 5 (PO 4 ) 3 Cl: Eu are particularly suitable for use in plasma displays because they provide high color saturation as well as efficient conversion of UV light show in blue light. In addition, they withstand the thermal stress during the production of the plasma screens.
  • the color screen is selected from the group of cathode ray tubes, plasma screens and liquid crystal displays.
  • These color screens equipped with a blue phosphor layer according to the invention have an increased luminance, since the improved blue light emission higher proportions of red and green light can be used for color representation.
  • the red and green light emission contribute more to the luminance of a color screen than the blue light emission.
  • a further advantage is that despite the increased levels of red and green light, the color impression for white light is not changed.
  • a plasma cell of an AC plasma display panel having a coplanar arrangement of the electrodes has a front panel 1 and a support plate 2.
  • the front panel 1 includes a glass plate 3 and on the glass plate 3 is a dielectric layer 4, preferably PbO-containing glass applied.
  • a dielectric layer 4 preferably PbO-containing glass applied.
  • strip-shaped discharge electrodes 6, 7 are applied, which are covered by the dielectric layer 4.
  • the discharge electrodes 6, 7 are made of metal or ITO, for example.
  • On the dielectric layer 4 is a protective layer 5 containing, for example, MgO.
  • the support plate 2 is made of glass and on the support plate 2 are parallel, strip-shaped, perpendicular to the discharge electrodes 6, 7 extending address electrodes 10 applied, for example, Ag. These are covered by a phosphor layer 9, which emits red, green or blue in one of the three basic colors.
  • the individual plasma cells are separated by a rib structure 12 with barrier ribs of preferably dielectric material.
  • a gas preferably a noble gas mixture of, for example, He, Ne or Kr, which is component Xe which generates UV light includes.
  • a plasma is formed in the plasma region 8, through which radiation 11 in the UV region, in particular in the VUV, is formed, depending on the composition of the gas. Area is generated.
  • This radiation 11 excites the phosphor layer 9 to light emitting visible light 13 in one of the three primary colors that passes through the front panel 1 to the outside and thus represents a luminous pixel on the screen.
  • the blue-emitting phosphor layer 9 for example, as blue-emitting phosphor is a Eu 2 + - fluorescent activated as BaMgAl 10 O 17: Eu or (Ba, Sr, Ca) 5 (PO 4) 3 Cl: Eu are used.
  • the blue-emitting phosphor layer also contains a second phosphor which has a light emission in the range from 380 to 450 nm, preferably in the range from 380 to 420 nm.
  • the second phosphor may be selected from the group of Tb 3+ -activated phosphors, the Eu 2+ -activated phosphors, the Bi 3+ -activated Phosphors, the Ga 3+ -activated phosphors and the Ce 3+ -activated phosphors.
  • the second phosphor may be selected, for example, from the group LaOBr: Tb, Y 2 O 2 S: Tb, Y 3 Al 5 O 12 : Tb, Ca 3 (PO 4 ) 2 : Eu, Sr 2 P 2 O 7 : Eu , (Sr, Mg) 2 P 2 O 7 : Eu, CaB 2 P 2 O 9 : Eu, CaSO 4 : Eu, CaO: Bi, ZnO: Ga and (Y, Gd) BO 3 : Ce. It is preferable that the concentration of Tb 3+ in the Tb 3+ -activated phosphors is 0.1 mol% or less.
  • the green-emitting phosphor for example, Zn 2 SiO 4 : Mn may be used, and as the red-emitting phosphor, for example, (Y, Gd) BO 3 : Eu may be used in the phosphor layer 9.
  • a manufacturing method for a phosphor layer 9 are both dry coating methods, such as electrostatic deposition or electrostatically assisted dusting, as well as wet coating method, such as screen printing, dispensing method in which a suspension is introduced with a channel moving along the nozzle, or sedimentation from the liquid phase, into consideration.
  • a suitable first phosphor is dispersed in water, an organic solvent, optionally together with a dispersant, a surfactant and an antifoaming agent or a binder preparation.
  • Suitable for binder formulations for plasma screens are inorganic binders which survive an operating temperature of 450 ° C without decomposition, embrittlement or discoloration, or organic binders which can later be removed by oxidation.
  • the second phosphor is added to the above suspension or it becomes a separate Suspension of the second phosphor produced.
  • the back plate 2 After applying the phosphor layer 9, the back plate 2 together with others Components such as a front plate 1 and a noble gas mixture used for the production of a plasma picture screen.
  • such a blue-emitting phosphor layer preparation can be used in all types of plasma picture screens, such as AC or non-matrix plasma display panels or DC plasma picture screens.
  • a color liquid crystal panel may include a light source, a polarizer, a liquid crystal cell, and an analyzer.
  • the blue phosphor layer may be applied to the inside of the front panel together with a red and a green phosphor layer.
  • a color cathode ray tube may have an electron gun for emitting at least one electron beam, a deflection device, a neck, and a cone connecting the face plate and the neck.
  • the respective areas of the phosphor layer are excited by differently strong irradiation with an electron beam to shine.
  • the current proportions for the production of white light can be equalized. This improves the luminance of the color cathode ray tube.
  • the color stability is also improved because deformations of the shadow mask cause less color changes.
  • a suspension of 40 g of BaMgAl 10 O 17 : Eu and 2 g of LaOBr: Tb (0.01 mol% of Tb 3+ ) was prepared, to which additives such as an organic binder and a dispersant were added.
  • additives such as an organic binder and a dispersant were added.
  • the suspension was applied to a back plate 2, which had a rib structure 12 and address electrodes 10, and dried. This process step was carried out successively for the other two phosphor types of the emission colors green and red.
  • a suspension of BaMgAl 10 O 17 : Eu was prepared to which additives such as an organic binder and a dispersant were added.
  • additives such as an organic binder and a dispersant were added.
  • the suspension was applied to a back plate 2, which had a rib structure 12 and address electrodes 10, and dried.
  • a suspension of 40 g of ZnS: Ag and 4 g of LaOBr: Tb (0.01 mol% of Tb 3+ ) was prepared, to which additives such as an organic binder and a dispersant were added.
  • the suspension was mixed with a 10% polyvinyl alcohol solution and, in addition, ammonium dichromate was added to the suspension.
  • the ratio of polyvinyl alcohol to ammonium dichromate was 10: 1.
  • the resulting mixture was applied to the inside of a faceplate.
  • the resulting layer was irradiated through a mask with UV light, thus crosslinking the polymer at the exposed locations.
  • the non-crosslinked areas of the phosphor layer were rinsed off.
  • An aluminum layer was vapor-deposited on the phosphor layer and the entire front plate was baked at 250 ° C. for 1 h.
  • Such a face plate was used together with a neck, a cone connecting the face plate to the neck, an electron gun for emitting three electron beams inside the neck, a deflection device, and a shadow mask for constructing a color cathode ray tube.
  • a color cathode ray tube having a blue phosphor layer containing ZnS: Ag and 20 wt% of LaOBr: Tb was prepared.
  • a color cathode ray tube with a blue phosphor layer containing only ZnS: Ag. was produced.
  • LaOBr.Tb [wt .-%] Share red Share green Proportion of blue 0 00:42 00:33 00:23 10 00:40 00:32 00:27 20 00:37 00:30 00:32
  • the ratio of the currents with which the individual regions of the phosphor layer are excited to emit visible light in one of the three primary colors is to represent the color white almost identical.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Luminescent Compositions (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (9)

  1. Écran en couleurs équipé d'une couche luminescente bleue (9) qui présente une première substance luminescente émettant en bleu possédant une émission de lumière de l'ordre de 430 à 490 nm,
    caractérisé en ce
    qu'il contient par ailleurs une deuxième substance luminescente qui présente une émission de lumière violet foncée de l'ordre de 380 à 450 nm.
  2. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que la deuxième substance luminescente présente une émission de lumière de l'ordre de 380 à 420 nm.
  3. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que la deuxième substance luminescente est sélectionnée dans le groupe des substances luminescentes activées au Tb3+, des substances luminescentes activées à l'Eu2+, des substances luminescentes activées au Bi3+, des substances luminescentes activées au Ga3+ et des substances luminescentes activées au Ce3+.
  4. Écran en couleurs selon la revendication 3
    caractérisé en ce
    que la deuxième substance luminescente est sélectionnée dans le groupe LaOBr:Tb, Y2O2S:Tb, Y3Al5O12:Tb, Ca3(PO4)2:Eu, Sr2P2O7:Eu, (Sr,Mg)2P2O7:Eu, CaB2P2O9:Eu, CaSO4:Eu, CaO:Bi, ZnO:Ga et (Y,Gd)BO3:Ce.
  5. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que la couche luminescente contient un mélange physique de particules de la première substance luminescente et de particules de la deuxième substance luminescente.
  6. Écran en couleurs selon la revendication 5
    caractérisé en ce
    que la proportion de la deuxième substance luminescente dans la couche luminescente s'élève entre 5 et 50 % en poids par rapport à la quantité de la première substance luminescente.
  7. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que la couche luminescente présente une couche de base de la première substance luminescente et une couche de couverture de la deuxième substance luminescente.
  8. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que la première substance luminescente est sélectionnée dans le groupe ZnS:Ag, BaMgAl10O17:Eu et (Ba,Sr,Ca)5(PO4)3Cl:Eu.
  9. Écran en couleurs selon la revendication 1,
    caractérisé en ce
    que l'écran en couleurs est sélectionné dans le groupe des tubes cathodiques, des écrans plasma et des écrans à cristaux liquides.
EP01000410A 2000-09-05 2001-08-30 Panneau d'affichage à couleurs avec couche luminescente bleue Expired - Lifetime EP1187167B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10043530 2000-09-05
DE10043530A DE10043530A1 (de) 2000-09-05 2000-09-05 Farbbildschirm mit blauer Leuchtstoffschicht

Publications (2)

Publication Number Publication Date
EP1187167A1 EP1187167A1 (fr) 2002-03-13
EP1187167B1 true EP1187167B1 (fr) 2006-10-04

Family

ID=7654926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01000410A Expired - Lifetime EP1187167B1 (fr) 2000-09-05 2001-08-30 Panneau d'affichage à couleurs avec couche luminescente bleue

Country Status (7)

Country Link
US (1) US6762548B2 (fr)
EP (1) EP1187167B1 (fr)
JP (1) JP2002175763A (fr)
KR (1) KR100765307B1 (fr)
CN (1) CN1305099C (fr)
DE (2) DE10043530A1 (fr)
TW (1) TWI264035B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10061720A1 (de) * 2000-12-12 2002-06-13 Philips Corp Intellectual Pty Plasmabildschirm mit Leuchtstoffschicht
US6616862B2 (en) * 2001-05-21 2003-09-09 General Electric Company Yellow light-emitting halophosphate phosphors and light sources incorporating the same
US7511428B2 (en) 2002-10-22 2009-03-31 Panasonic Corporation Plasma display panel
EP1647044A2 (fr) * 2003-07-15 2006-04-19 Philips Intellectual Property & Standards GmbH Element d'eclairage de couleur ajustable
KR100666265B1 (ko) 2004-10-18 2007-01-09 엘지이노텍 주식회사 형광체 및 이를 이용한 발광소자
KR20090044800A (ko) * 2007-11-01 2009-05-07 삼성전기주식회사 인산계 나노 형광체 및 나노 형광체 제조 방법
CN102660264B (zh) * 2012-04-17 2014-06-04 绍兴文理学院 一种近紫外光激发白光LED用ZnO基荧光粉材料及其制备方法
CN108517210B (zh) * 2018-06-07 2021-01-08 齐鲁工业大学 一种Ce3+, Dy3+掺杂的颜色可控的荧光粉及其制备方法

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8303782A (nl) * 1983-11-03 1985-06-03 Philips Nv Beeldbuis.
US4623816A (en) * 1985-04-22 1986-11-18 General Electric Company Fluorescent lamp using multi-layer phosphor coating
GB2214706B (en) * 1988-01-29 1992-06-03 Ferranti Plc Colour-monochrome visual display device
JPH02120389A (ja) * 1988-10-28 1990-05-08 Toshiba Corp 蛍光ランプ
JPH02135276A (ja) * 1988-11-16 1990-05-24 Hitachi Ltd ブラウン管
CA2041089C (fr) * 1990-05-10 1995-01-17 Yasuo Iwasaki Couche pour la plaque de face d'un tube cathodique couleur
MY109224A (en) 1993-02-11 1996-12-31 Samsung Display Devices Co Ltd Mixed blue emitting phosphor.
KR100268715B1 (ko) 1993-02-11 2000-11-01 김순택 혼합 청색발광 형광체
EP0686997A3 (fr) * 1994-06-06 1996-06-26 Matsushita Electric Ind Co Ltd Lampe à décharge et dispositif d'éclairage pour un éclairage général
KR100197579B1 (ko) * 1996-12-03 1999-06-15 손욱 이중층 형광막 및 그의 제조방법
KR100199557B1 (ko) * 1996-12-13 1999-06-15 손욱 플리커리스 브라운관용 형광막 및 그 제조 방법
JPH10208647A (ja) 1997-01-29 1998-08-07 Nec Kansai Ltd プラズマディスプレイパネル
US6010644A (en) * 1997-05-09 2000-01-04 Kabushiki Kaisha Ohara Long-lasting phosphor
JPH1196923A (ja) * 1997-09-19 1999-04-09 Fujitsu Ltd プラズマディスプレイパネル
JP4151104B2 (ja) 1998-03-31 2008-09-17 株式会社日立製作所 プラズマディスプレイ

Also Published As

Publication number Publication date
US6762548B2 (en) 2004-07-13
KR100765307B1 (ko) 2007-10-10
CN1342991A (zh) 2002-04-03
DE50111136D1 (de) 2006-11-16
KR20020019392A (ko) 2002-03-12
JP2002175763A (ja) 2002-06-21
DE10043530A1 (de) 2002-03-14
EP1187167A1 (fr) 2002-03-13
CN1305099C (zh) 2007-03-14
TWI264035B (en) 2006-10-11
US20020047510A1 (en) 2002-04-25

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