WO2017046881A1 - Light-emitting device - Google Patents

Light-emitting device Download PDF

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Publication number
WO2017046881A1
WO2017046881A1 PCT/JP2015/076236 JP2015076236W WO2017046881A1 WO 2017046881 A1 WO2017046881 A1 WO 2017046881A1 JP 2015076236 W JP2015076236 W JP 2015076236W WO 2017046881 A1 WO2017046881 A1 WO 2017046881A1
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electrode
organic layer
current source
current
light emitting
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PCT/JP2015/076236
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French (fr)
Japanese (ja)
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石塚　真一
吉田　綾子
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パイオニア株式会社
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Priority to JP2017540385A priority Critical patent/JPWO2017046881A1/en
Priority to PCT/JP2015/076236 priority patent/WO2017046881A1/en
Publication of WO2017046881A1 publication Critical patent/WO2017046881A1/en

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • 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
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources
    • 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 a light emitting device.
  • An organic EL element is one of the light sources of a light emitting device.
  • the organic EL element has a configuration in which an organic layer is disposed between two electrodes.
  • Some organic EL elements have a plurality of organic layers between two electrodes.
  • organic EL elements having a plurality of types of organic layers having different emission characteristics such as emission color have also been proposed.
  • Patent Document 1 discloses that a first electrode made of ITO, a first organic layer, a second electrode, a second organic layer, a third electrode, a third organic layer, and a fourth electrode are formed on a substrate. It has the structure which piled up in order.
  • the first electrode is grounded
  • the second electrode is connected to the output terminal of the first operational amplifier
  • the third electrode is connected to the output terminal of the second operational amplifier
  • the output terminals of the third operational amplifier are connected to the four electrodes.
  • the non-inverting input terminal of the first operational amplifier, the non-inverting input terminal of the second operational amplifier, and the non-inverting input terminal of the third operational amplifier are connected to different input terminals.
  • the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also connected to the non-inverting input terminal of the third operational amplifier.
  • Patent Document 2 in an organic EL device in which a first electrode, a first light emitting layer, an intermediate electrode layer, a second light emitting layer, and a second electrode are stacked in this order, the second electrode and the third electrode are connected to a variable resistor. It is described that the connection is made through. Patent Document 2 describes that the brightness of the second light emitting layer can be adjusted by adjusting the resistance of the variable resistor.
  • the luminance of each of the plurality of light emitting layers can be controlled independently of each other.
  • the amount of current in the second organic layer is increased by controlling the second operational amplifier, the amount of current flowing from the second organic layer to the first organic layer also increases. End up. For this reason, it is difficult to increase the ratio of the luminance of the second organic layer to the luminance of the first organic layer.
  • the brightness of the second organic layer is adjusted by reducing the amount of current flowing from the first organic layer to the second organic layer using a variable resistor. For this reason, even if the ratio of the luminance of the second organic layer to the luminance of the first organic layer can be lowered, this ratio cannot be made a certain value or more.
  • An example of a problem to be solved by the present invention is that the ratio of the luminance of the second organic layer to the luminance of the first organic layer can be increased.
  • the invention according to claim 1 is a first electrode; A second electrode overlapping the first electrode; A third electrode overlapping the second electrode; A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer; A second organic layer located between the second electrode and the third electrode and including a light emitting layer; A first current source connected to the first electrode; A second current source connected to the second electrode and independent of the first current source; A controller for controlling the first current source and the second current source; With The peak wavelength of the emission spectrum of the first organic layer is a light emitting device different from the peak wavelength of the emission spectrum of the second organic layer.
  • the invention according to claim 4 is a first electrode; A second electrode overlapping the first electrode; A third electrode overlapping the second electrode; A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer; A second organic layer located between the second electrode and the third electrode and including a light emitting layer; With The peak wavelength of the emission spectrum of the first organic layer is different from the peak wavelength of the emission spectrum of the second organic layer, In the light-emitting device, independent current sources are connected to the first electrode and the second electrode.
  • FIG. 2 is an equivalent circuit diagram of the light emitting device shown in FIG. 1. It is a figure explaining operation
  • the color temperature of the light-emitting device is a diagram showing a first example of the relationship between the current I 2 flowing from the second current source.
  • the color temperature of the light-emitting device is a diagram illustrating a second example of the relationship between the current I 2 flowing from the second current source.
  • FIG. 1 is a cross-sectional view showing a configuration of a light emitting device 10 according to an embodiment.
  • FIG. 2 is an equivalent circuit diagram of the light emitting device 10 shown in FIG.
  • the light emitting device 10 according to the embodiment includes a first electrode 110, a first organic layer 120, a second electrode 130, a second organic layer 140, a third electrode 150, a control unit 210, a first current source 220, and a second current.
  • a source 240 is included.
  • the second electrode 130 overlaps the first electrode 110, and the third electrode 150 overlaps the second electrode 130.
  • the first organic layer 120 is located between the first electrode 110 and the second electrode 130, and the second organic layer 140 is located between the second electrode 130 and the third electrode 150.
  • the first current source 220 is connected to the first electrode 110.
  • the second current source 240 is independent of the first current source 220 and is connected to the second electrode 130.
  • the controller 210 controls the first current source 220 and the second current source 240.
  • the peak wavelength of the emission spectrum of the first organic layer 120 is different from the peak wavelength of the emission spectrum of the second organic layer 140. In other words, the emission color of the first organic layer 120 is different from the emission color of the second organic layer 140. Details will be described below.
  • the first electrode 110, the first organic layer 120, the second electrode 130, the second organic layer 140, and the third electrode 150 are formed on the first surface of the substrate 100.
  • the substrate 100 is formed of a light-transmitting material such as glass or a light-transmitting resin.
  • the substrate 100 is, for example, a polygon such as a rectangle.
  • the substrate 100 may have flexibility.
  • the thickness of the substrate 100 is, for example, not less than 10 ⁇ m and not more than 1000 ⁇ m.
  • the thickness of the substrate 100 is, for example, 200 ⁇ m or less.
  • the material of the substrate 100 includes, for example, PEN (polyethylene naphthalate), PES (polyethersulfone), PET (polyethylene terephthalate), or polyimide. Is formed.
  • an inorganic barrier film such as SiN x or SiON is formed on at least the light emitting surface (preferably both surfaces) of the substrate 100 in order to suppress moisture from passing through the substrate 100. ing.
  • the first electrode 110 and the second electrode 130 are transparent electrodes having optical transparency.
  • the transparent conductive material constituting the transparent electrode is a metal-containing material, for example, a metal oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IWZO (Indium Tungsten Zinc Oxide), ZnO (Zinc Oxide) or the like. is there.
  • the thickness of the first electrode 110 and the second electrode 130 is, for example, not less than 10 nm and not more than 500 nm.
  • the first electrode 110 and the second electrode 130 are formed using, for example, a sputtering method or a vapor deposition method.
  • the first electrode 110 and the second electrode 130 may be a carbon nanotube or a conductive organic material such as PEDOT / PSS.
  • the second electrode 130 has a structure in which a layer containing the material of the third electrode 150, which will be described later, is laminated on a layer containing these materials, or a structure in which the material of the third electrode 150 is arranged in a net shape. May be.
  • the layer made of the material of the third electrode 150 is preferably 500 nm or less.
  • the third electrode 150 is made of, for example, a metal selected from the first group consisting of Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of a metal selected from the first group. Contains a metal layer. In this case, the third electrode 150 has a light shielding property.
  • the thickness of the third electrode 150 is, for example, not less than 10 nm and not more than 500 nm. However, the third electrode 150 may be formed using the material exemplified as the material of the first electrode 110.
  • the third electrode 150 is formed using, for example, a sputtering method or a vapor deposition method.
  • Each of the first organic layer 120 and the second organic layer 140 has a configuration in which a hole injection layer, a light emitting layer, and an electron injection layer are laminated in this order.
  • a hole transport layer may be formed between the hole injection layer and the light emitting layer.
  • an electron transport layer may be formed between the light emitting layer and the electron injection layer.
  • the first organic layer 120 and the second organic layer 140 may be formed by an evaporation method.
  • at least one layer of the first organic layer 120, for example, a layer in contact with the first electrode 110 may be formed by a coating method such as an inkjet method, a printing method, or a spray method.
  • At least one layer of the second organic layer 140 for example, a layer in contact with the second electrode 130 may be formed by a coating method such as an inkjet method, a printing method, or a spray method.
  • the remaining layers of the first organic layer 120 and the remaining layers of the second organic layer 140 are formed by an evaporation method.
  • all the layers of the 1st organic layer 120 and all the layers of the 2nd organic layer 140 may be formed using the apply
  • the peak wavelength of the emission spectrum of the first organic layer 120 is different from the peak wavelength of the emission spectrum of the second organic layer 140.
  • the first organic layer 120 has a peak in the red wavelength region
  • the second organic layer 140 has a peak on the shorter wavelength side (for example, the blue wavelength region) than red.
  • the light emission color of the light emitting device 10 is a color (for example, white) obtained by mixing the light emission color of the first organic layer 120 and the light emission color of the second organic layer 140.
  • the emission color of the light emitting device 10 can be changed by changing the ratio of the luminance of the second organic layer 140 to the luminance of the first organic layer 120. Note that the peak of the first organic layer 120 and the peak of the second organic layer 140 may be reversed.
  • the first electrode 110 serves as the anode of the first organic layer 120, and the output terminal of the first current source 220 is connected thereto.
  • the second electrode 130 serves as the cathode of the first organic layer 120 and serves as the anode of the second organic layer 140.
  • the output terminal of the second current source 240 is further connected to the second electrode 130.
  • the third electrode 150 is a cathode of the second organic layer 140 and is applied with a ground potential.
  • the first current source 220 and the second current source 240 are current sources and are controlled by the control unit 210.
  • the first current source 220 and the second current source 240 are, for example, switching regulators.
  • the first current source 220 and the second current source 240 may be current sources having other structures.
  • the controller 210 causes the first organic layer 120 and the second organic layer 140 to emit light in two patterns of the first mode and the second mode.
  • the controller 210 turns on the first current source 220 and turns off the second current source 240.
  • the control unit 210 turns on the first current source 220 and the second current source 240. Accordingly, the current flowing through the second organic layer 140 is greater than the current flowing through the first organic layer 120. Details will be described below.
  • the current flowing through the first current source 220 is I 1
  • the current flowing through the second current source 240 is I 2
  • the current flowing through the first organic layer 120 is I 01
  • the control unit 210 turns on the first current source 220 and the second current source 240.
  • the current I 01 flowing through the first organic layer 120 is equal to the current I 1 flowing from the first current source 220 as in the first mode.
  • the controller 210 can control the difference between the luminance of the first organic layer 120 and the luminance of the second organic layer 140 by controlling the current I 2 flowing from the second current source 240. Therefore, the control unit 210 can make the emission color of the light emitting device 10 in the second mode different from the emission color of the light emitting device 10 in the first mode. Then, the difference in the color, can be controlled by the current I 2 flowing from the second current source 240.
  • FIG. 8 is a diagram illustrating a first example of the relationship between the color temperature of the light emitting device 10 and the current I 2 flowing from the second current source 240.
  • the emission color of the first organic layer 120 is blue
  • the emission color of the second organic layer 140 is yellow.
  • the color temperature of the light emitting device 10 is 5000K
  • the light emission color of the light emitting device 10 is white, which has a high color temperature.
  • the second mode as I 2 increases, the color temperature of the light emitting device 10 decreases.
  • FIG. 9 is a diagram illustrating a second example of the relationship between the color temperature of the light emitting device 10 and the current I 2 flowing from the second current source 240.
  • the emission color of the first organic layer 120 is yellow
  • the emission color of the second organic layer 140 is blue.
  • the color temperature of the light emitting device 10 is 3000 K
  • the light emission color of the light emitting device 10 is white with a low color temperature.
  • the color temperature of the light emitting device 10 increases, for example, increases to 5000K.
  • the control unit 210 has the first mode and the second mode as the control mode of the light emitting device 10.
  • the controller 210 operates only the first current source 220 in the first mode, and operates the first current source 220 and the second current source 240 in the second mode. Therefore, the brightness of the second organic layer 140 can be increased while the brightness of the first organic layer 120 is fixed. For this reason, the control part 210 can make the luminescent color of the light-emitting device 10 in a 2nd mode differ from the luminescent color of the light-emitting device 10 in a 1st mode. The color difference can be controlled by the current I 2 flowing from the second current source 240.

Abstract

A second electrode (130) overlaps a first electrode (110), and a third electrode (150) overlaps the second electrode (130). A first organic layer (120) is positioned between the first electrode (110) and the second electrode (130), and a second organic layer (140) is positioned between the second electrode (130) and the third electrode (150). A first current source (220) is connected to the first electrode (110), and a second current source (240) is connected to the second electrode (130). A control unit (210) controls the first current source (220) and the second current source (240). The peak wavelength of the emission spectrum of the first organic layer (120) differs from the peak wavelength of the emission spectrum of the second organic layer (140).

Description

発光装置Light emitting device
　本発明は、発光装置に関する。 The present invention relates to a light emitting device.
　発光装置の光源の一つに有機ＥＬ素子がある。有機ＥＬ素子は、２つの電極の間に有機層を配置した構成を有している。有機ＥＬ素子には、２つの電極の間に複数の有機層を有するものがある。近年は、例えば発光色など発光特性の異なる複数種類の有機層を有する有機ＥＬ素子も提案されている。 An organic EL element is one of the light sources of a light emitting device. The organic EL element has a configuration in which an organic layer is disposed between two electrodes. Some organic EL elements have a plurality of organic layers between two electrodes. In recent years, for example, organic EL elements having a plurality of types of organic layers having different emission characteristics such as emission color have also been proposed.
　例えば特許文献１には、基板の上にＩＴＯからなる第１電極、第１の有機層、第２電極、第２の有機層、第３電極、第３の有機層、及び第４電極をこの順に重ねた構成を有している。このような構成において、第１電極は接地され、第２電極には第１のオペアンプの出力端子が接続されており、第３電極には第２のオペアンプの出力端子が接続されており、第４電極には第３のオペアンプの出力端子が接続されている。第１のオペアンプの非反転入力端子、第２のオペアンプの非反転入力端子、及び第３のオペアンプの非反転入力端子は、それぞれ互いに異なる入力端子に接続している。また、第２のオペアンプの非反転入力端子には第１のオペアンプの出力端子も接続されており、第３のオペアンプの非反転入力端子には第２のオペアンプの出力端子も接続されている。 For example, Patent Document 1 discloses that a first electrode made of ITO, a first organic layer, a second electrode, a second organic layer, a third electrode, a third organic layer, and a fourth electrode are formed on a substrate. It has the structure which piled up in order. In such a configuration, the first electrode is grounded, the second electrode is connected to the output terminal of the first operational amplifier, the third electrode is connected to the output terminal of the second operational amplifier, The output terminals of the third operational amplifier are connected to the four electrodes. The non-inverting input terminal of the first operational amplifier, the non-inverting input terminal of the second operational amplifier, and the non-inverting input terminal of the third operational amplifier are connected to different input terminals. In addition, the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier, and the output terminal of the second operational amplifier is also connected to the non-inverting input terminal of the third operational amplifier.
　また特許文献２には、第１電極、第１発光層、中間電極層、第２発光層、及び第２電極をこの順に積層した有機ＥＬ装置において、第２電極と第３電極とを可変抵抗を介して接続することが記載されている。特許文献２において、可変抵抗の抵抗を調整することにより、第２発光層に輝度を調節することができる、と記載されている。 Further, in Patent Document 2, in an organic EL device in which a first electrode, a first light emitting layer, an intermediate electrode layer, a second light emitting layer, and a second electrode are stacked in this order, the second electrode and the third electrode are connected to a variable resistor. It is described that the connection is made through. Patent Document 2 describes that the brightness of the second light emitting layer can be adjusted by adjusting the resistance of the variable resistor.
特表２００１－５１１２９６号公報JP 2001-511296 A 特開２０１４－１５００００号公報JP 2014-150000 A
　互いに発光色が異なる複数の発光層を積層した有機ＥＬ素子において、発光色を調整するためには、複数の発光層それぞれの輝度を互いに独立して制御できるようにすることが好ましい。しかし、特許文献１に記載の方法では、第２のオペアンプを制御して第２の有機層の電流量を増加させると、第２の有機層から第１の有機層に流れる電流量も増加してしまう。このため、第１の有機層の輝度に対する第２の有機層の輝度の比率を大きくしにくい。 In an organic EL element in which a plurality of light emitting layers having different light emission colors are stacked, in order to adjust the light emission color, it is preferable that the luminance of each of the plurality of light emitting layers can be controlled independently of each other. However, in the method described in Patent Document 1, when the amount of current in the second organic layer is increased by controlling the second operational amplifier, the amount of current flowing from the second organic layer to the first organic layer also increases. End up. For this reason, it is difficult to increase the ratio of the luminance of the second organic layer to the luminance of the first organic layer.
　また、特許文献２に記載の方法では、可変抵抗を用いて第１の有機層から第２の有機層に流れる電流量を減らすことにより第２の有機層の輝度を調節している。このため、第１の有機層の輝度に対する第２の有機層の輝度の比率を下げることはできても、この比率を一定値以上にすることはできない。 In the method described in Patent Document 2, the brightness of the second organic layer is adjusted by reducing the amount of current flowing from the first organic layer to the second organic layer using a variable resistor. For this reason, even if the ratio of the luminance of the second organic layer to the luminance of the first organic layer can be lowered, this ratio cannot be made a certain value or more.
　本発明が解決しようとする課題としては、第１の有機層の輝度に対する第２の有機層の輝度の比率を上げる方向に制御できるようにすることが一例として挙げられる。 An example of a problem to be solved by the present invention is that the ratio of the luminance of the second organic layer to the luminance of the first organic layer can be increased.
　請求項１に記載の発明は、第１電極と、
　前記第１電極と重なっている第２電極と、
　前記第２電極と重なっている第３電極と、
　前記第１電極と前記第２電極の間に位置していて発光層を含む第１有機層と、
　前記第２電極と前記第３電極の間に位置していて発光層を含む第２有機層と、
　前記第１電極に接続している第１電流源と、
　前記第２電極に接続しており、前記第１電流源から独立している第２電流源と、
　前記第１電流源及び前記第２電流源を制御する制御部と、
を備え、
　前記第１有機層の発光スペクトルのピーク波長は、前記第２有機層の発光スペクトルのピーク波長と異なる発光装置である。 The invention according to claim 1 is a first electrode;
A second electrode overlapping the first electrode;
A third electrode overlapping the second electrode;
A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer;
A second organic layer located between the second electrode and the third electrode and including a light emitting layer;
A first current source connected to the first electrode;
A second current source connected to the second electrode and independent of the first current source;
A controller for controlling the first current source and the second current source;
With
The peak wavelength of the emission spectrum of the first organic layer is a light emitting device different from the peak wavelength of the emission spectrum of the second organic layer.
　請求項４に記載の発明は、第１電極と、
　前記第１電極と重なっている第２電極と、
　前記第２電極と重なっている第３電極と、
　前記第１電極と前記第２電極の間に位置していて発光層を含む第１有機層と、
　前記第２電極と前記第３電極の間に位置していて発光層を含む第２有機層と、
を備え、
　前記第１有機層の発光スペクトルのピーク波長は、前記第２有機層の発光スペクトルのピーク波長と異なり、
　前記第１電極及び前記第２電極には、互いに独立した電流源が接続される発光装置である。 The invention according to claim 4 is a first electrode;
A second electrode overlapping the first electrode;
A third electrode overlapping the second electrode;
A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer;
A second organic layer located between the second electrode and the third electrode and including a light emitting layer;
With
The peak wavelength of the emission spectrum of the first organic layer is different from the peak wavelength of the emission spectrum of the second organic layer,
In the light-emitting device, independent current sources are connected to the first electrode and the second electrode.
　上述した目的、およびその他の目的、特徴および利点は、以下に述べる好適な実施の形態、およびそれに付随する以下の図面によってさらに明らかになる。 The above-described object and other objects, features, and advantages will be further clarified by a preferred embodiment described below and the following drawings attached thereto.
実施形態に係る発光装置の構成を示す断面図である。It is sectional drawing which shows the structure of the light-emitting device which concerns on embodiment. 図１に示した発光装置の等価回路図である。FIG. 2 is an equivalent circuit diagram of the light emitting device shown in FIG. 1. 制御部の動作について説明する図である。It is a figure explaining operation | movement of a control part. 制御部の第１モードについて説明する図である。It is a figure explaining the 1st mode of a control part. 制御部の第１モードについて説明する図である。It is a figure explaining the 1st mode of a control part. 制御部の第２モードについて説明する図である。It is a figure explaining the 2nd mode of a control part. 制御部の第２モードについて説明する図である。It is a figure explaining the 2nd mode of a control part. 発光装置の色温度と、第２電流源から流れる電流I２の関係の第１例を示す図である。The color temperature of the light-emitting device is a diagram showing a first example of the relationship between the current I 2 flowing from the second current source. 発光装置の色温度と、第２電流源から流れる電流I２の関係の第２例を示す図である。The color temperature of the light-emitting device is a diagram illustrating a second example of the relationship between the current I 2 flowing from the second current source.
　以下、本発明の実施の形態について、図面を用いて説明する。尚、すべての図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.
　図１は、実施形態に係る発光装置１０の構成を示す断面図である。図２は、図１に示した発光装置１０の等価回路図である。実施形態に係る発光装置１０は、第１電極１１０、第１有機層１２０、第２電極１３０、第２有機層１４０、第３電極１５０、制御部２１０、第１電流源２２０、及び第２電流源２４０を有している。第２電極１３０は第１電極１１０と重なっており、第３電極１５０は第２電極１３０と重なっている。第１有機層１２０は第１電極１１０と第２電極１３０の間に位置しており、第２有機層１４０は第２電極１３０と第３電極１５０の間に位置している。第１電流源２２０は第１電極１１０に接続している。第２電流源２４０は第１電流源２２０から独立しており、第２電極１３０に接続している。制御部２１０は第１電流源２２０及び第２電流源２４０を制御する。そして、第１有機層１２０の発光スペクトルのピーク波長は、第２有機層１４０の発光スペクトルのピーク波長と異なる。言い換えると、第１有機層１２０の発光色は、第２有機層１４０の発光色と異なる。以下、詳細に説明する。 FIG. 1 is a cross-sectional view showing a configuration of a light emitting device 10 according to an embodiment. FIG. 2 is an equivalent circuit diagram of the light emitting device 10 shown in FIG. The light emitting device 10 according to the embodiment includes a first electrode 110, a first organic layer 120, a second electrode 130, a second organic layer 140, a third electrode 150, a control unit 210, a first current source 220, and a second current. A source 240 is included. The second electrode 130 overlaps the first electrode 110, and the third electrode 150 overlaps the second electrode 130. The first organic layer 120 is located between the first electrode 110 and the second electrode 130, and the second organic layer 140 is located between the second electrode 130 and the third electrode 150. The first current source 220 is connected to the first electrode 110. The second current source 240 is independent of the first current source 220 and is connected to the second electrode 130. The controller 210 controls the first current source 220 and the second current source 240. The peak wavelength of the emission spectrum of the first organic layer 120 is different from the peak wavelength of the emission spectrum of the second organic layer 140. In other words, the emission color of the first organic layer 120 is different from the emission color of the second organic layer 140. Details will be described below.
　第１電極１１０、第１有機層１２０、第２電極１３０、第２有機層１４０、及び第３電極１５０は、基板１００の第１面に形成されている。 The first electrode 110, the first organic layer 120, the second electrode 130, the second organic layer 140, and the third electrode 150 are formed on the first surface of the substrate 100.
　基板１００は、例えばガラスや透光性の樹脂などの透光性の材料で形成されている。基板１００は、例えば矩形などの多角形である。ここで、基板１００は可撓性を有していてもよい。基板１００が可撓性を有している場合、基板１００の厚さは、例えば１０μｍ以上１０００μｍ以下である。特に基板１００をガラス材料で可撓性を持たせる場合、基板１００の厚さは、例えば２００μｍ以下である。基板１００を樹脂材料で可撓性を持たせる場合は、基板１００の材料として、例えばＰＥＮ（ポリエチレンナフタレート）、ＰＥＳ（ポリエーテルサルホン）、ＰＥＴ（ポリエチレンテレフタラート）、又はポリイミドを含ませて形成されている。また、基板１００が樹脂材料を含む場合、水分が基板１００を透過することを抑制するために、基板１００の少なくとも発光面（好ましくは両面）に、ＳｉＮｘやＳｉＯＮなどの無機バリア膜が形成されている。 The substrate 100 is formed of a light-transmitting material such as glass or a light-transmitting resin. The substrate 100 is, for example, a polygon such as a rectangle. Here, the substrate 100 may have flexibility. In the case where the substrate 100 has flexibility, the thickness of the substrate 100 is, for example, not less than 10 μm and not more than 1000 μm. In particular, when the substrate 100 is made of a glass material and has flexibility, the thickness of the substrate 100 is, for example, 200 μm or less. In the case where the substrate 100 is made of a resin material and is flexible, the material of the substrate 100 includes, for example, PEN (polyethylene naphthalate), PES (polyethersulfone), PET (polyethylene terephthalate), or polyimide. Is formed. In the case where the substrate 100 includes a resin material, an inorganic barrier film such as SiN x or SiON is formed on at least the light emitting surface (preferably both surfaces) of the substrate 100 in order to suppress moisture from passing through the substrate 100. ing.
　第１電極１１０及び第２電極１３０は、光透過性を有する透明電極である。透明電極を構成する透明導電材料は、金属を含む材料、例えば、ＩＴＯ（Ｉｎｄｉｕｍ　Ｔｉｎ　Ｏｘｉｄｅ）、ＩＺＯ（Ｉｎｄｉｕｍ　Ｚｉｎｃ　Ｏｘｉｄｅ）、ＩＷＺＯ（Ｉｎｄｉｕｍ　Ｔｕｎｇｓｔｅｎ　Ｚｉｎｃ　Ｏｘｉｄｅ）、ＺｎＯ（Ｚｉｎｃ　Ｏｘｉｄｅ）等の金属酸化物である。第１電極１１０及び第２電極１３０の厚さは、例えば１０ｎｍ以上５００ｎｍ以下である。第１電極１１０及び第２電極１３０は、例えばスパッタリング法又は蒸着法を用いて形成される。なお、第１電極１１０及び第２電極１３０は、カーボンナノチューブ、又はＰＥＤＯＴ／ＰＳＳなどの導電性有機材料であってもよい。また、第２電極１３０は、これらの材料を含む層の上に、後述する第３電極１５０の材料を含む層との積層した構造や、第３電極１５０の材料を網状に配置した構造であってもよい。この場合、第３電極１５０の材料からなる層は５００ｎｍ以下であることが好ましい。 The first electrode 110 and the second electrode 130 are transparent electrodes having optical transparency. The transparent conductive material constituting the transparent electrode is a metal-containing material, for example, a metal oxide such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IWZO (Indium Tungsten Zinc Oxide), ZnO (Zinc Oxide) or the like. is there. The thickness of the first electrode 110 and the second electrode 130 is, for example, not less than 10 nm and not more than 500 nm. The first electrode 110 and the second electrode 130 are formed using, for example, a sputtering method or a vapor deposition method. The first electrode 110 and the second electrode 130 may be a carbon nanotube or a conductive organic material such as PEDOT / PSS. The second electrode 130 has a structure in which a layer containing the material of the third electrode 150, which will be described later, is laminated on a layer containing these materials, or a structure in which the material of the third electrode 150 is arranged in a net shape. May be. In this case, the layer made of the material of the third electrode 150 is preferably 500 nm or less.
　第３電極１５０は、例えば、Ａｌ、Ａｕ、Ａｇ、Ｐｔ、Ｍｇ、Ｓｎ、Ｚｎ、及びＩｎからなる第１群の中から選択される金属又はこの第１群から選択される金属の合金からなる金属層を含んでいる。この場合、第３電極１５０は遮光性を有している。第３電極１５０の厚さは、例えば１０ｎｍ以上５００ｎｍ以下である。ただし、第３電極１５０は、第１電極１１０の材料として例示した材料を用いて形成されていてもよい。第３電極１５０は、例えばスパッタリング法又は蒸着法を用いて形成される。 The third electrode 150 is made of, for example, a metal selected from the first group consisting of Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of a metal selected from the first group. Contains a metal layer. In this case, the third electrode 150 has a light shielding property. The thickness of the third electrode 150 is, for example, not less than 10 nm and not more than 500 nm. However, the third electrode 150 may be formed using the material exemplified as the material of the first electrode 110. The third electrode 150 is formed using, for example, a sputtering method or a vapor deposition method.
　第１有機層１２０及び第２有機層１４０は、いずれも、正孔注入層、発光層、及び電子注入層をこの順に積層させた構成を有している。正孔注入層と発光層との間には正孔輸送層が形成されていてもよい。また、発光層と電子注入層との間には電子輸送層が形成されていてもよい。第１有機層１２０及び第２有機層１４０は蒸着法で形成されてもよい。また、第１有機層１２０のうち少なくとも一つの層、例えば第１電極１１０と接触する層は、インクジェット法、印刷法、又はスプレー法などの塗布法によって形成されてもよい。また、第２有機層１４０のうち少なくとも一つの層、例えば第２電極１３０と接触する層は、インクジェット法、印刷法、又はスプレー法などの塗布法によって形成されてもよい。なお、この場合、第１有機層１２０の残りの層及び第２有機層１４０の残りの層は、蒸着法によって形成されている。また、第１有機層１２０のすべての層及び第２有機層１４０のすべての層が、塗布法を用いて形成されていてもよい。 Each of the first organic layer 120 and the second organic layer 140 has a configuration in which a hole injection layer, a light emitting layer, and an electron injection layer are laminated in this order. A hole transport layer may be formed between the hole injection layer and the light emitting layer. In addition, an electron transport layer may be formed between the light emitting layer and the electron injection layer. The first organic layer 120 and the second organic layer 140 may be formed by an evaporation method. In addition, at least one layer of the first organic layer 120, for example, a layer in contact with the first electrode 110 may be formed by a coating method such as an inkjet method, a printing method, or a spray method. In addition, at least one layer of the second organic layer 140, for example, a layer in contact with the second electrode 130 may be formed by a coating method such as an inkjet method, a printing method, or a spray method. In this case, the remaining layers of the first organic layer 120 and the remaining layers of the second organic layer 140 are formed by an evaporation method. Moreover, all the layers of the 1st organic layer 120 and all the layers of the 2nd organic layer 140 may be formed using the apply | coating method.
　上記したように、第１有機層１２０の発光スペクトルのピーク波長は、第２有機層１４０の発光スペクトルのピーク波長と異なる。例えば、第１有機層１２０は赤色の波長域にピークを有しており、第２有機層１４０は赤色より短波長側（例えば青色の波長域）にピークを有している。このため、発光装置１０の発光色は、第１有機層１２０の発光色と第２有機層１４０の発光色を混ぜた色（例えば白色）になる。そして、発光装置１０の発光色は、第１有機層１２０の輝度に対する第２有機層１４０の輝度の比率を変更することにより、変更することができる。なお、第１有機層１２０が有するピークと第２有機層１４０が有するピークは逆であってもよい。 As described above, the peak wavelength of the emission spectrum of the first organic layer 120 is different from the peak wavelength of the emission spectrum of the second organic layer 140. For example, the first organic layer 120 has a peak in the red wavelength region, and the second organic layer 140 has a peak on the shorter wavelength side (for example, the blue wavelength region) than red. For this reason, the light emission color of the light emitting device 10 is a color (for example, white) obtained by mixing the light emission color of the first organic layer 120 and the light emission color of the second organic layer 140. The emission color of the light emitting device 10 can be changed by changing the ratio of the luminance of the second organic layer 140 to the luminance of the first organic layer 120. Note that the peak of the first organic layer 120 and the peak of the second organic layer 140 may be reversed.
　そして、第１電極１１０は第１有機層１２０の陽極となっており、かつ、第１電流源２２０の出力端子が接続されている。また、第２電極１３０は第１有機層１２０の陰極となっており、かつ第２有機層１４０の陽極になっている。第２電極１３０は、さらに、第２電流源２４０の出力端子が接続されている。そして第３電極１５０は第２有機層１４０の陰極であり、かつ、接地電位が印加されている。 The first electrode 110 serves as the anode of the first organic layer 120, and the output terminal of the first current source 220 is connected thereto. The second electrode 130 serves as the cathode of the first organic layer 120 and serves as the anode of the second organic layer 140. The output terminal of the second current source 240 is further connected to the second electrode 130. The third electrode 150 is a cathode of the second organic layer 140 and is applied with a ground potential.
　第１電流源２２０及び第２電流源２４０は電流源であり、制御部２１０によって制御されている。第１電流源２２０及び第２電流源２４０は、例えばスイッチングレギュレータである。ただし、第１電流源２２０及び第２電流源２４０は、他の構造の電流源であってもよい。 The first current source 220 and the second current source 240 are current sources and are controlled by the control unit 210. The first current source 220 and the second current source 240 are, for example, switching regulators. However, the first current source 220 and the second current source 240 may be current sources having other structures.
　次に、制御部２１０の動作について説明する。制御部２１０は、図３に示すように、第１有機層１２０及び第２有機層１４０を、第１モード及び第２モードの２パターンで発光させる。第１モードでは、制御部２１０は、第１電流源２２０をオンにして、第２電流源２４０をオフにする。その結果、第１有機層１２０と第２有機層１４０には同じ大きさの電流が流れる。第２モードでは、制御部２１０は、第１電流源２２０及び第２電流源２４０をオンにする。これにより、第２有機層１４０に流れる電流は第１有機層１２０に流れる電流よりも多くなる。以下、詳細に説明する。以下の説明において、図２に示すように、第１電流源２２０が流す電流をＩ１、第２電流源２４０が流す電流をＩ２、第１有機層１２０に流れる電流をＩ０１、第２有機層１４０に流れる電流をＩ０２とする。 Next, the operation of the control unit 210 will be described. As shown in FIG. 3, the controller 210 causes the first organic layer 120 and the second organic layer 140 to emit light in two patterns of the first mode and the second mode. In the first mode, the controller 210 turns on the first current source 220 and turns off the second current source 240. As a result, the same current flows through the first organic layer 120 and the second organic layer 140. In the second mode, the control unit 210 turns on the first current source 220 and the second current source 240. Accordingly, the current flowing through the second organic layer 140 is greater than the current flowing through the first organic layer 120. Details will be described below. In the following description, as shown in FIG. 2, the current flowing through the first current source 220 is I 1 , the current flowing through the second current source 240 is I 2 , the current flowing through the first organic layer 120 is I 01 , the second the current flowing through the organic layer 140 to I 02.
　まず、図４及び図５を用いて、第１モードについて説明する。第１モードにおいて、制御部２１０は、第１電流源２２０から第１電極１１０に電流を流す。この際、制御部２１０は第２電流源２４０を動作させない。すなわちＩ２＝０にする。これにより、第１電極１１０から第３電極１５０に電流Ｉ１が流れる。その結果、第１有機層１２０に流れる電流Ｉ０１と第２有機層１４０が流れる電流Ｉ０２はいずれもＩ１になる。このため、図４及び図５に示すように、第１電流源２２０からの電流Ｉ１が大きくなると、Ｉ１に比例して電流Ｉ０１及び電流Ｉ０２は大きくなり、その結果、第１有機層１２０が発光する光の強度(輝度)及び第２有機層１４０が発光する光の強度（輝度）も大きくなる。一方、第１電流源２２０からの電流Ｉ１が小さくなると、Ｉ１に比例して電流Ｉ０１及び電流Ｉ０２は小さくなり、その結果、第１有機層１２０が発光する光の強度(輝度)及び第２有機層１４０が発光する光の強度（輝度）も小さくなる。 First, the first mode will be described with reference to FIGS. 4 and 5. In the first mode, the controller 210 causes a current to flow from the first current source 220 to the first electrode 110. At this time, the controller 210 does not operate the second current source 240. That is, I 2 = 0. As a result, a current I 1 flows from the first electrode 110 to the third electrode 150. As a result, the current I 01 flowing through the first organic layer 120 and the current I 02 flowing through the second organic layer 140 are both I 1 . For this reason, as shown in FIGS. 4 and 5, when the current I 1 from the first current source 220 increases, the current I 01 and the current I 02 increase in proportion to I 1, and as a result, the first organic The intensity (luminance) of light emitted from the layer 120 and the intensity (luminance) of light emitted from the second organic layer 140 are also increased. On the other hand, when the current I 1 from the first current source 220 is reduced, the current I 01 and the current I 02 in proportion to I 1 decreases, the intensity of that light first organic layer 120 emits light (luminance) In addition, the intensity (luminance) of light emitted from the second organic layer 140 is also reduced.
　次に、第２モードについて、図６及び図７を用いて説明する。第２モードでは、上記したように、制御部２１０は第１電流源２２０及び第２電流源２４０をオンにする。これにより、図６に示すように、第１有機層１２０に流れる電流Ｉ０１は、第１モードと同様に第１電流源２２０から流れる電流Ｉ１に等しい。一方、図７に示すように、第２有機層１４０に流れる電流Ｉ０２は、第１有機層１２０を流れてきた電流Ｉ０１（＝Ｉ１）に、第２電流源２４０から流れてきた電流Ｉ２を加えた量になる。従って、第１有機層１２０の輝度を固定したまま、第２有機層１４０の輝度を大きくすることができる。そして、制御部２１０は、第１有機層１２０の輝度と第２有機層１４０の輝度の差は、第２電流源２４０から流れる電流I２を制御することにより、制御できる。従って、制御部２１０は、第２モードにおける発光装置１０の発光色を、第１モードにおける発光装置１０の発光色と異ならせることができる。そして、その色の差を、第２電流源２４０から流れる電流I２により制御することができる。 Next, the second mode will be described with reference to FIGS. In the second mode, as described above, the control unit 210 turns on the first current source 220 and the second current source 240. Thereby, as shown in FIG. 6, the current I 01 flowing through the first organic layer 120 is equal to the current I 1 flowing from the first current source 220 as in the first mode. On the other hand, as shown in FIG. 7, the current I 02 flowing through the second organic layer 140 is equal to the current I 01 (= I 1 ) flowing through the first organic layer 120 and the current flowing from the second current source 240. I 2 is added. Therefore, the brightness of the second organic layer 140 can be increased while the brightness of the first organic layer 120 is fixed. The controller 210 can control the difference between the luminance of the first organic layer 120 and the luminance of the second organic layer 140 by controlling the current I 2 flowing from the second current source 240. Therefore, the control unit 210 can make the emission color of the light emitting device 10 in the second mode different from the emission color of the light emitting device 10 in the first mode. Then, the difference in the color, can be controlled by the current I 2 flowing from the second current source 240.
　図８は、発光装置１０の色温度と、第２電流源２４０から流れる電流I２の関係の第１例を示す図である。本図に示す例において、第１有機層１２０の発光色は青色であり、第２有機層１４０の発光色は黄色である。第１モード（すなわちI２＝０）において、発光装置１０の色温度は５０００Ｋであり、発光装置１０の発光色は色温度が高い白になる。ここで第２モードでは、I２が増えるにつれて、発光装置１０の色温度は下がっていく。 FIG. 8 is a diagram illustrating a first example of the relationship between the color temperature of the light emitting device 10 and the current I 2 flowing from the second current source 240. In the example shown in this figure, the emission color of the first organic layer 120 is blue, and the emission color of the second organic layer 140 is yellow. In the first mode (that is, I 2 = 0), the color temperature of the light emitting device 10 is 5000K, and the light emission color of the light emitting device 10 is white, which has a high color temperature. Here, in the second mode, as I 2 increases, the color temperature of the light emitting device 10 decreases.
　図９は、発光装置１０の色温度と、第２電流源２４０から流れる電流I２の関係の第２例を示す図である。本図に示す例において、第１有機層１２０の発光色は黄色であり、第２有機層１４０の発光色は青色である。第１モード（すなわちI２＝０）において、発光装置１０の色温度は３０００Ｋであり、発光装置１０の発光色は色温度が低い白になる。ここで第２モードでは、I２が増えるにつれて、発光装置１０の色温度は上がっていき、例えば５０００Ｋまで上がる。 FIG. 9 is a diagram illustrating a second example of the relationship between the color temperature of the light emitting device 10 and the current I 2 flowing from the second current source 240. In the example shown in this figure, the emission color of the first organic layer 120 is yellow, and the emission color of the second organic layer 140 is blue. In the first mode (that is, I 2 = 0), the color temperature of the light emitting device 10 is 3000 K, and the light emission color of the light emitting device 10 is white with a low color temperature. Here, in the second mode, as I 2 increases, the color temperature of the light emitting device 10 increases, for example, increases to 5000K.
　以上、本実施形態によれば、制御部２１０は、発光装置１０の制御モードとして第１モード及び第２モードを有している。制御部２１０は、第１モードでは第１電流源２２０のみを動作させ、第２モードでは第１電流源２２０及び第２電流源２４０を動作させる。従って、第１有機層１２０の輝度を固定したまま、第２有機層１４０の輝度を大きくすることができる。このため、制御部２１０は、第２モードにおける発光装置１０の発光色を、第１モードにおける発光装置１０の発光色と異ならせることができる。そして、その色の差を、第２電流源２４０から流れる電流I２により制御することができる。 As described above, according to the present embodiment, the control unit 210 has the first mode and the second mode as the control mode of the light emitting device 10. The controller 210 operates only the first current source 220 in the first mode, and operates the first current source 220 and the second current source 240 in the second mode. Therefore, the brightness of the second organic layer 140 can be increased while the brightness of the first organic layer 120 is fixed. For this reason, the control part 210 can make the luminescent color of the light-emitting device 10 in a 2nd mode differ from the luminescent color of the light-emitting device 10 in a 1st mode. The color difference can be controlled by the current I 2 flowing from the second current source 240.
　以上、図面を参照して実施形態及び実施例について述べたが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 As mentioned above, although embodiment and the Example were described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

Claims (4)

  1. 　第１電極と、
    　前記第１電極と重なっている第２電極と、
    　前記第２電極と重なっている第３電極と、
    　前記第１電極と前記第２電極の間に位置していて発光層を含む第１有機層と、
    　前記第２電極と前記第３電極の間に位置していて発光層を含む第２有機層と、
    　前記第１電極に接続している第１電流源と、
    　前記第２電極に接続しており、前記第１電流源から独立している第２電流源と、
    　前記第１電流源及び前記第２電流源を制御する制御部と、
    を備え、
    　前記第１有機層の発光スペクトルのピーク波長は、前記第２有機層の発光スペクトルのピーク波長と異なる発光装置。     A first electrode;
    A second electrode overlapping the first electrode;
    A third electrode overlapping the second electrode;
    A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer;
    A second organic layer located between the second electrode and the third electrode and including a light emitting layer;
    A first current source connected to the first electrode;
    A second current source connected to the second electrode and independent of the first current source;
    A controller for controlling the first current source and the second current source;
    With
    The peak wavelength of the emission spectrum of the first organic layer is different from the peak wavelength of the emission spectrum of the second organic layer.
  2. 　請求項１に記載の発光装置において、
    　前記第１電極、前記第１有機層、前記第２電極、前記第２有機層、及び前記第３電極は、透光性の基板の上に形成されており、
    　前記第１電極は透光性の電極である発光装置。     The light-emitting device according to claim 1.
    The first electrode, the first organic layer, the second electrode, the second organic layer, and the third electrode are formed on a translucent substrate,
    The light emitting device, wherein the first electrode is a translucent electrode.
  3. 　請求項１又は２に記載の発光装置において、
    　前記制御部は、動作モードとして、
    　　前記第１電流源から電流を供給して前記第２電流源から電流を供給しない第１モードと、
    　　前記第１電流源及び前記第２電流源のそれぞれから電流を供給する第２モードと、
    を有する発光装置。     The light-emitting device according to claim 1 or 2,
    The control unit has an operation mode as follows:
    A first mode in which current is supplied from the first current source and current is not supplied from the second current source;
    A second mode for supplying current from each of the first current source and the second current source;
    A light emitting device.
  4. 　第１電極と、
    　前記第１電極と重なっている第２電極と、
    　前記第２電極と重なっている第３電極と、
    　前記第１電極と前記第２電極の間に位置していて発光層を含む第１有機層と、
    　前記第２電極と前記第３電極の間に位置していて発光層を含む第２有機層と、
    を備え、
    　前記第１有機層の発光スペクトルのピーク波長は、前記第２有機層の発光スペクトルのピーク波長と異なり、
    　前記第１電極及び前記第２電極には、互いに独立した電流源が接続される発光装置。     A first electrode;
    A second electrode overlapping the first electrode;
    A third electrode overlapping the second electrode;
    A first organic layer that is located between the first electrode and the second electrode and includes a light emitting layer;
    A second organic layer located between the second electrode and the third electrode and including a light emitting layer;
    With
    The peak wavelength of the emission spectrum of the first organic layer is different from the peak wavelength of the emission spectrum of the second organic layer,
    A light emitting device in which independent current sources are connected to the first electrode and the second electrode.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010524221A (en) * 2007-04-02 2010-07-15 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Driving method of light emitting diode
JP2010218903A (en) * 2009-03-17 2010-09-30 Canon Inc Light emitting apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010524221A (en) * 2007-04-02 2010-07-15 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Driving method of light emitting diode
JP2010218903A (en) * 2009-03-17 2010-09-30 Canon Inc Light emitting apparatus

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