WO2005074006A1 - An anode in a field emission light source and a field emission light source comprising the anode - Google Patents
An anode in a field emission light source and a field emission light source comprising the anode Download PDFInfo
- Publication number
- WO2005074006A1 WO2005074006A1 PCT/SE2005/000106 SE2005000106W WO2005074006A1 WO 2005074006 A1 WO2005074006 A1 WO 2005074006A1 SE 2005000106 W SE2005000106 W SE 2005000106W WO 2005074006 A1 WO2005074006 A1 WO 2005074006A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- anode
- layer
- light source
- field emission
- emission light
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J63/00—Cathode-ray or electron-stream lamps
- H01J63/02—Details, e.g. electrode, gas filling, shape of vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J63/00—Cathode-ray or electron-stream lamps
- H01J63/06—Lamps with luminescent screen excited by the ray or stream
Definitions
- the present invention relates to an anode in a field emission light source. According to a second aspect, the present invention relates to a field emission light source comprising the anode .
- a light source in US 5,877,588 includes an evacuated container having walls at least a portion of which consists of an outer glass layer on which at least a major part thereof is coated on the inside with a layer of phosphor forming a luminescent layer.
- a conductive layer form is an anode.
- the layer of phosphor is excited to luminescence by electron bombardment from a field emission cathode located in the interior of the container, and a modulator electrode or grid is arranged between the cathode and the anode for creating an electric field for the emission of electrons.
- the field emission cathode includes field-emitting bodies in the form of fibres, and a base body having a longitudinally extending core formed by at least two wires between which the fibres are secured.
- a light source is presented that comprises an evacuated container having walls, at least a portion of which consists of an outer glass layer which on at least a major part thereof is coated on the inside with a layer of phosphor forming a luminescent layer and a conductive layer forming an anode.
- the layer of phosphor is excited to luminescence by electron bombardment from a field emission cathode located in an interior of the container.
- a modulator electrode is arranged between the cathode and the anode for creating an electrical field necessary for the emission of electrons.
- the phosphor layer is a luminescent layer which upon electron bombardment emits visible light.
- the anode is preferably made of a reflecting, electricall_y conductive material, e.g. aluminium.
- a field emission light source of the above type may present energy losses in the electrically conductive material due to absorption. There is also a risk of accumulation of charge.
- manufacture of light sources of the above type presents a rather high complexity.
- the anode comprises an electrically conductive layer and a luminescent layer that is luminescent when excited by electron bombardment caused by a potentia.1 difference between the electrically conductive layer and a cathode.
- the luminescent layer is arranged between the electrically conductive layer and the cathode, that the electrically conductive layer is a transparent electrically conducting layer, and that the thickness of the transparent electrically conducting layer is in the interval 100- lOOOnm.
- the transparent electrically conducting layer offers the opportunity of more electrons being excited in the luminescent layer since the electrons does not have to go through the transparent electrically conducting layer before they excite the luminescent layer.
- the transparent electrically conducting layer being transparent is a necessity since otherwise no light would be transmitted through it.
- the conductance of the transparent electrically conducting layer will be proportional to the thickness in the case of bulk conduction.
- the conduction mechanism undergoes transitions from insulating type, when the average thickness of the transparent electrically conducting layer is so small that it consists of detached crystallites, to percolation type, when the average thickness is still small, the transparent electrically conducting layer consists of weakly coupled crystallites, and finally to bulk conduction, when the thickness is sufficiently large, the transparent electrically conducting layer has become a continuous film.
- Bulk conduction usually emerges, at the average thickness above 100 ran.
- the relation between the thickness and the transparency of the electrically conducting layer is such that the transparency decreases as the thickness increases.
- the thickness of the transparent electrically conducting layer is in the interval 300-700nm, more preferably is in the interval
- the potential difference is in the interval of 4-12 kV, and more preferably is in the interval 5-llkV. A potential difference within this interval offers the advantage of providing a suitable electron bombardment for exciting the luminescent layer to emit light.
- the transparent electrically conducting layer is at least one of: Indium Tin oxide (ITO) , and Zinc oxide (ZnO) . These materials offer the advantage that they are transparent and present suitable conductive properties.
- the anode further comprises an enclosing transparent structure on which the electrically conducting layer is fixed.
- the transparent structure is a made of glass.
- a field emission light source comprising the anode according to the first aspect is disclosed. In terms of enabling the present invention, a number of alternatives manufacturing processes are available.
- the anode may be manufactured by using a pouring in and pouring out process, a spray method, spin coating or printing.
- cathodoluminescence wherein the production of visible light is done by direct impingement of electrons on the phosphors.
- Photoluminescence concerns a fluorescent light source based on a phosphor excited by a molecular discharge.
- plasma is produced from atomic or molecular vapour in the lamp enclosing transparent structure. The radiation produced by the plasma is used to excite a phosphor coated on the inner surface of the lamp.
- an embodiment of an anode 1 in a field emission light source according to the present invention is disclosed.
- a preferred embodiment of a field emission light source comprising the anode is disclosed.
- a graph showing the relation between the electrical conductance and the average thickness of the electrically conducting layer, based on experimental measurements, is disclosed.
- a graph showing the relation between the transparency and the average thickness of the electrically conducting layer, based on experimental measurements is disclosed.
- an embodiment of an anode 1 in a field emission light source according to the present invention is disclosed.
- the anode 1 comprises an electrically conductive layer 3 and a luminescent layer 5 that is luminescent when excited by electron bombardment 7 caused by a potential difference 9 between the electrically conductive layer 3 and a cathode 11.
- the luminescent layer 5 is arranged between the electrically conductive layer 3 and the cathode 11.
- the electrically conductive layer 3 is a transparent electrically conducting layer 3.
- the luminescent layer 5 is directly adjacent to the transparent electrically conductive layer 3.
- the thickness of the transparent electrically conducting layer 3 is in the interval 100-lOOOnm, more preferably in the interval 400-600nm and even more preferably in the interval 450-550nm.
- the potential difference 9, ⁇ V is in the interval of 4-12 kV, and more preferably in the interval 5-llkV.
- the transparent electrically conducting layer is Indium Tin oxide (ITO) , and in another preferred embodiment it is Zinc oxide (ZnO) .
- the anode 1 comprises an enclosing transparent structure 13 on which the electrically conducting layer 3 is fixed.
- the transparent structure 13 is a made of glass.
- the glass is provided with dimming features.
- a preferred embodiment of a field emission light source 15 comprising the anode 1 is disclosed.
- an embodiment of an anode 1 in a field emission light source according to the present invention is disclosed.
- the anode 1 comprises an electrically conductive layer 3 and a luminescent layer 5 that is luminescent when excited by electron bombardment
- the luminescent layer 5 is arranged between the electrically conductive layer 3 and the cathode 11.
- the electrically conductive layer 3 is a transparent electrically conducting layer 3.
- the luminescent layer 5 is directly adjacent to the transparent electrically conductive layer 3.
- experiments performed indicates that the electrical conductance, S, increases as the average thickness of the electrically conducting layer 3 increases.
- experiments performed indicate that the transparency decreases as the average thickness of the electrically conducting layer 3 increases .
- the electrical conductance was measured after each cycle to monitor the transitions from near insulator to percolation conduction and to bulk conduction (as shown in Figure 3) .
- the increased conductance reflects an improved connection between the droplets after each subsequent cycle, and that a substantial increase in conductance reflects the establishment of bulk conductivity.
- an opacity tester was used after each cycle to monitor the transition from a transparent to an opaque condition (as shown in Figure 4) .
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05704772A EP1709665A1 (en) | 2004-01-29 | 2005-01-28 | An anode in a field emission light source and a field emission light source comprising the anode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0400156-6 | 2004-01-29 | ||
SE0400156A SE0400156D0 (en) | 2004-01-29 | 2004-01-29 | An anode in a field emission light source and a field emission light source comprising the anode |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005074006A1 true WO2005074006A1 (en) | 2005-08-11 |
Family
ID=31493118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2005/000106 WO2005074006A1 (en) | 2004-01-29 | 2005-01-28 | An anode in a field emission light source and a field emission light source comprising the anode |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1709665A1 (en) |
CN (2) | CN1922712A (en) |
SE (1) | SE0400156D0 (en) |
WO (1) | WO2005074006A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2339610A1 (en) | 2009-12-22 | 2011-06-29 | LightLab Sweden AB | Reflective anode structure for a field emission lighting arrangement |
WO2011076522A1 (en) | 2009-12-21 | 2011-06-30 | Lightlab Sweden Ab | Resonance circuitry for a field emission lighting arrangement |
EP2375435A1 (en) | 2010-04-06 | 2011-10-12 | LightLab Sweden AB | Field emission cathode |
EP2472552A1 (en) | 2010-12-28 | 2012-07-04 | LightLab Sweden AB | Field emission lighting arrangement |
EP2472553A1 (en) | 2010-12-28 | 2012-07-04 | LightLab Sweden AB | Electrical power control of a field emission lighting system |
US8847476B2 (en) | 2008-12-04 | 2014-09-30 | The Regents Of The University Of California | Electron injection nanostructured semiconductor material anode electroluminescence method and device |
EP2784800A1 (en) * | 2013-03-25 | 2014-10-01 | LightLab Sweden AB | Shaped cathode for a field emission arrangement |
US10475616B2 (en) | 2015-05-18 | 2019-11-12 | Lightlab Sweden Ab | Method for manufacturing nanostructures for a field emission cathode |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011153695A1 (en) * | 2010-06-09 | 2011-12-15 | 海洋王照明科技股份有限公司 | Conductive glue mixture, fluorescent screen anode plate and manufacture method thereof |
TWI492669B (en) * | 2012-08-22 | 2015-07-11 | Univ Nat Defense | Field emission anode and manufacturing method thereof |
EP3035368B1 (en) | 2014-12-17 | 2019-01-30 | LightLab Sweden AB | Field emission light source |
US10319553B2 (en) | 2016-03-16 | 2019-06-11 | Lightlab Sweden Ab | Method for controllably growing ZnO Nanowires |
Citations (4)
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US4937503A (en) * | 1988-04-11 | 1990-06-26 | Gte Laboratories Incorporated | Fluorescent light source based on a phosphor excited by a molecular discharge |
US5905334A (en) * | 1995-07-31 | 1999-05-18 | Casio Computer Co., Ltd. | Cold-cathode discharge device for emitting light |
US20020079827A1 (en) * | 2000-12-27 | 2002-06-27 | Park Hong Bae | Flat luminescent lamp and method for manufacturing the same |
US6573643B1 (en) * | 1992-03-16 | 2003-06-03 | Si Diamond Technology, Inc. | Field emission light source |
Family Cites Families (3)
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SE510412C2 (en) * | 1997-06-13 | 1999-05-25 | Lightlab Ab | A light source comprising a field emission cathode and a field emission cathode for use in a light source |
SE515377C2 (en) * | 1999-07-30 | 2001-07-23 | Nanolight Internat Ltd | Light source including a field emission cathode |
US6322712B1 (en) * | 1999-09-01 | 2001-11-27 | Micron Technology, Inc. | Buffer layer in flat panel display |
-
2004
- 2004-01-29 SE SE0400156A patent/SE0400156D0/en unknown
-
2005
- 2005-01-28 CN CNA2005800034948A patent/CN1922712A/en active Pending
- 2005-01-28 CN CN2011104026257A patent/CN102522317A/en active Pending
- 2005-01-28 EP EP05704772A patent/EP1709665A1/en not_active Withdrawn
- 2005-01-28 WO PCT/SE2005/000106 patent/WO2005074006A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4937503A (en) * | 1988-04-11 | 1990-06-26 | Gte Laboratories Incorporated | Fluorescent light source based on a phosphor excited by a molecular discharge |
US6573643B1 (en) * | 1992-03-16 | 2003-06-03 | Si Diamond Technology, Inc. | Field emission light source |
US5905334A (en) * | 1995-07-31 | 1999-05-18 | Casio Computer Co., Ltd. | Cold-cathode discharge device for emitting light |
US20020079827A1 (en) * | 2000-12-27 | 2002-06-27 | Park Hong Bae | Flat luminescent lamp and method for manufacturing the same |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8847476B2 (en) | 2008-12-04 | 2014-09-30 | The Regents Of The University Of California | Electron injection nanostructured semiconductor material anode electroluminescence method and device |
JP2013515338A (en) * | 2009-12-21 | 2013-05-02 | ライトラブ スウェーデン アクティエボラーグ | Resonant circuit for field emission lighting device |
WO2011076522A1 (en) | 2009-12-21 | 2011-06-30 | Lightlab Sweden Ab | Resonance circuitry for a field emission lighting arrangement |
US20130009563A1 (en) * | 2009-12-21 | 2013-01-10 | Lightlab Sweden Ab | Resonance circuitry for a field emission lighting arrangement |
WO2011076523A1 (en) | 2009-12-22 | 2011-06-30 | Lightlab Sweden Ab | Reflective anode structure for a field emission lighting arrangement |
US9041276B2 (en) | 2009-12-22 | 2015-05-26 | Lightlab Sweden Ab | Reflective anode structure for a field emission lighting arrangement |
TWI482195B (en) * | 2009-12-22 | 2015-04-21 | Lightlab Sweden Ab | Reflective anode structure for a field emission lighting arrangement |
EP2339610A1 (en) | 2009-12-22 | 2011-06-29 | LightLab Sweden AB | Reflective anode structure for a field emission lighting arrangement |
EP2375435A1 (en) | 2010-04-06 | 2011-10-12 | LightLab Sweden AB | Field emission cathode |
WO2011124555A1 (en) | 2010-04-06 | 2011-10-13 | Lightlab Sweden Ab | Field emission cathode |
WO2012089467A1 (en) | 2010-12-28 | 2012-07-05 | Lightlab Sweden Ab | Field emission lighting arrangement |
WO2012089468A1 (en) | 2010-12-28 | 2012-07-05 | Lightlab Sweden Ab | Electrical power control of a field emission lighting system |
EP2472553A1 (en) | 2010-12-28 | 2012-07-04 | LightLab Sweden AB | Electrical power control of a field emission lighting system |
EP2472552A1 (en) | 2010-12-28 | 2012-07-04 | LightLab Sweden AB | Field emission lighting arrangement |
EP2784800A1 (en) * | 2013-03-25 | 2014-10-01 | LightLab Sweden AB | Shaped cathode for a field emission arrangement |
WO2014154505A1 (en) * | 2013-03-25 | 2014-10-02 | Lightlab Sweden Ab | Shaped cathode for a field emission arrangement |
US10043649B2 (en) | 2013-03-25 | 2018-08-07 | Lightlab Sweden Ab | Shaped cathode for a field emission arrangement |
US10475616B2 (en) | 2015-05-18 | 2019-11-12 | Lightlab Sweden Ab | Method for manufacturing nanostructures for a field emission cathode |
Also Published As
Publication number | Publication date |
---|---|
CN102522317A (en) | 2012-06-27 |
EP1709665A1 (en) | 2006-10-11 |
CN1922712A (en) | 2007-02-28 |
SE0400156D0 (en) | 2004-01-29 |
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