JPH06267301A - Organic photoluminescence element - Google Patents

Organic photoluminescence element

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Publication number
JPH06267301A
JPH06267301A JP5385393A JP5385393A JPH06267301A JP H06267301 A JPH06267301 A JP H06267301A JP 5385393 A JP5385393 A JP 5385393A JP 5385393 A JP5385393 A JP 5385393A JP H06267301 A JPH06267301 A JP H06267301A
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light emitting
pl
emitting layer
organic
light
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Kazunori Menda
和典 免田
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Olympus Optical Co Ltd
オリンパス光学工業株式会社
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Abstract

PURPOSE: To provide desired luminescence without exciting a light emitting layer doped with an organic pigment by exciting a PL light emitting film, and emitting the visible light having the wavelength corresponding to the doped organic pigment.
CONSTITUTION: A Schottky junction exists on the boundary face between an ITO electrode 23 and a ZnO film 24. When a forward bias is applied to this junction, ultraviolet rays are generated in a depletion layer extended on the ZnO side near the junction. The ultraviolet rays transmit a glass substrate 21 and excite a PL light emitting layer 22. Green visible light is emitted from the light emitting layer 22. When the PL light emitting layer 22 is excited by ultraviolet rays, the deterioration by Joule's heat is avoided, and a longer life can be obtained.
COPYRIGHT: (C)1994,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、有機エレクトロルミネッセンス素子(以下、有機EL素子という)の改良に関し、より具体的には、通電しなくても所望の発光を得ることができるホトルミネッセンス素子に関する。 BACKGROUND OF THE INVENTION This invention relates to an organic electroluminescent device (hereinafter, referred to as organic EL device) relates to an improvement of, more particularly, to photoluminescence device can without energizing obtain the desired emission .

【0002】 [0002]

【従来の技術】有機EL素子は、薄型、面発光かつ低電力駆動という優れた特徴を有しており、また添加する色素を変えることによって、発光波長を可視領域で変化させることができる。 BACKGROUND ART Organic EL devices, thin, has excellent feature that the surface-emitting and low power driving, also by changing the dye to be added, the emission wavelength can be changed in the visible region. このため、特にフルカラーのフラットパネルディスプレイを実現できる可能性をもった素子として注目され、活発な研究が行われている。 Thus, of particular interest as a device having a possibility of realizing a full-color flat panel display, active research is being carried out.

【0003】図5は、従来の低電流注入型有機EL素子の構造を示している(脇本健夫:日本学術新興会、光電相互変換第125委員会、第8回EL分科会資料(1992) [0003] Figure 5 shows the structure of a conventional low current injection type organic EL device (Takeo Wakimoto: Japan Society Emerging Association, Optoelectronic 125th Committee, 8th EL Subcommittee article (1992)
26)。 26). 図示のように、この素子では、ガラス基板1上にITO(酸化インジウム錫)からなる透明電極2、TP As shown, in this device, a transparent electrode 2 made of ITO (indium tin oxide) on a glass substrate 1, TP
D(テトラフェニルジアミン誘電体)からなる正孔輸送層3、有機色素(キナクリドン誘導体)を添加したAL D (tetraphenyldiamine dielectric) hole transport layer 3 made of, AL addition of organic dye (quinacridone derivative)
Q3 (アルミニウム錯体)からなる発光層4およびMg Q3 emitting layer 4 made of (aluminum complex) and Mg
- Ag背面電極5を、真空蒸着法により順次積層した構造が採用されている。 - an Ag back electrode 5 are sequentially stacked structure is adopted by a vacuum deposition method.

【0004】上記のような素子に、100 mA/cm 2 [0004] element, such as described above, 100 mA / cm 2 (素子間電圧:数V)程度の電流を注入すると、波長 540nm Injection of: (element voltage several V) current of about the wavelength 540nm
(緑)、10 4 (Green), 10 4 cd/m 2 cd / m 2 程度の発光を得ることができる。 Light emission can be obtained degree.
また、発光層4に添加する誘起色素の種類を変えることによって、発光波長を変化させることができる。 Further, by changing the type of induced dye to be added to the light-emitting layer 4, it is possible to change the emission wavelength.

【0005】一方、特開平 1-312873 号には、一方が透明である一対の電極間に、有機蛍光体薄膜層と、正孔伝導性を示す無機半導体層とを設けた有機EL素子が開示されている。 On the other hand, Japanese Unexamined Patent Publication No. 1-312873, between a pair of electrodes one of which is transparent, and an organic phosphor thin film layer, an organic EL element provided an inorganic semiconductor layer showing a hole-conducting discloses It is. そして、この有機EL素子の電極間に直流電圧を印加することにより、緑色発光を得ることが記載されている。 Then, by applying a DC voltage between the electrodes of the organic EL element is described to obtain a green light emission.

【0006】 [0006]

【発明が解決しようとする課題】上記従来の有機EL素子において発光を得るためには、有機色素がドープされた発光層中に電子または正孔を注入するために通電しなければならない。 For obtaining light emission in the conventional organic EL device [0005] should be energized for injecting electrons or holes into the light emitting layer of the organic dye doped. しかし、このように電流を流すとジュール熱により温度が上昇し、数10℃に加熱されると有機色素は変質(溶解)してしまう。 However, temperature rises due to Joule heat in this way electric current, when heated to a few 10 ° C. The organic dye results in deterioration (dissolution). 従って、有機EL素子の寿命は、一般にZnS等を用いた無機EL素子よりも短いという欠点がある。 Therefore, the lifetime of the organic EL device has a disadvantage in general that is shorter than an inorganic EL element using ZnS and the like.

【0007】上記のように、有機EL素子は、添加する色素を変えることによって発光波長を可視領域で変化させ得るためカラーディスプレイ等への応用が期待されているが、通電による発熱に弱い欠点があり、この欠点が有機EL素子の実用化を困難にしている。 [0007] As described above, the organic EL element is applied to a color display and the like because they can alter the visible region is expected emission wavelengths by changing the dye to be added, is weak drawbacks heat generated by energization There, the defect is difficult to practical application of organic EL devices.

【0008】本発明はかかる事情に鑑みてなされたもので、その課題は、有機色素をドープした発光層に通電することなく、所望の発光を得ることができる有機ホトルミネッセンス素子を提供することである。 [0008] The present invention has been made in view of such circumstances, and an object thereof is, without energizing the light emitting layer doped with organic dyes, to provide an organic photo-luminescent elements capable of obtaining a desired emission is there.

【0009】 [0009]

【課題を解決するための手段および作用】上記課題を達成するために、本発明では、有機色素をドープした発光層から所望の発光を得るために、エレクトロルミネッセンス(EL)ではなく、ホトルミネッセンス(PL)を利用することとした。 To achieve SUMMARY and operation for solving the above problems, the present invention, in order to obtain the desired emission from the light-emitting layer doped with organic dye, rather than electroluminescence (EL), photoluminescence ( it was decided to use the PL). 即ち、本発明においては、従来のEL素子のように電荷(正孔または電子)を注入するのではなく、可視光よりも光子エネルギーの大きい電磁波(例えば紫外線、X線、β線またはγ線等)を照射して発光物質を励起し、発光させることとした。 That is, in the present invention, instead of injected charges (holes or electrons) as in the conventional EL devices, a large electromagnetic wave (for example, ultraviolet photon energy than visible light, X-rays, beta-rays or γ-rays, etc. ) was irradiated with exciting the luminescent material, it was decided to emit light.

【0010】従って、本発明による有機PL素子は、紫外線に対して透明な基板と、該基板の表面に設けられた発光性有機材料層と、前記基板の裏面に設けられた可視光よりも光子エネルギーの大きい電磁波を放射する固体素子とを具備したことを特徴とするものである。 Accordingly, the organic PL device according to the present invention, the photon and the substrate transparent to ultraviolet light, and light-emitting organic material layer provided on the surface of the substrate, than the visible light provided on the back surface of the substrate it is characterized in that a large electromagnetic wave energy; and a solid-state device that emits.

【0011】図1は、本発明の上記原理を実現するためのPL素子構造の一例を概念的に示している。 [0011] Figure 1 schematically shows an example of the PL device structure for implementing the principles of the present invention. 同図において、11は紫外線に対して透明な材料からなる基板である。 In the figure, 11 is a substrate made of a material transparent to ultraviolet radiation. 該基板11の表面には、有機色素を添加したPL On the surface of the substrate 11, and adding an organic dye PL
発光膜12が形成されている。 Emitting film 12 is formed. また、基板11の裏面には、紫外線を発生する固体発光素子13が形成されている。 Further, on the back surface of the substrate 11, the solid-state light-emitting element 13 which generates ultraviolet rays is formed.

【0012】かかる素子構造において、固体発光素子1 [0012] In such a device structure, the solid-state light-emitting element 1
3から放射された紫外線は、透明基板11を透過してP UV emitted from 3 is transmitted through the transparent substrate 11 P
L発光膜12に照射され、該PL発光膜を励起する。 It is irradiated to the L-emitting film 12 to excite the PL luminous layer. 励起されたPL発光膜12は、ドープされている有機色素に対応した波長の可視光を放出する。 Excited PL emission film 12 emits visible light of wavelengths corresponding to the organic dye is doped.

【0013】こうして、本発明の有機PL素子によれば、有機色素をドープしたPL発光膜に通電することなく、所望の発光を得ることができる。 [0013] Thus, according to the organic PL element of the present invention, without energizing the PL emission film doped with organic dye, it is possible to obtain a desired light emission. 従って、通電によるジュール熱の発生と、これによる有機色素の変質が回避され、寿命の長い有機発光素子を得ることができる。 Accordingly, the generation of Joule heat by energization, which by avoids deterioration of the organic dye, it is possible to obtain a long organic light emitting device lifetime.

【0014】なお、図1の概念図では、固体発光素子1 [0014] In the conceptual diagram of FIG. 1, the solid-state light-emitting element 1
3として紫外線発光素子を用いたが、可能な場合には、 Using ultraviolet light emitting element as 3, but if possible,
X線、β線、γ線等の放射線を放出する素子を用いてもよい。 X-rays, beta-rays, may be used an element that emits radiation of γ-rays. 例えば、β線またはγ線を放出する放射能物質を封入した素子を用いることが可能である。 For example, it is possible to use a device encapsulating radioactive substance that emits β rays or γ-rays.

【0015】 [0015]

【実施例】 【Example】

<第1実施例> <First embodiment>

【0016】図2は、ZnO紫外線発光素子を用いた、 [0016] Figure 2, ZnO was used ultraviolet light emitting element,
本発明の一実施例になる緑色PL素子を示している。 It shows a green PL device according to one embodiment of the present invention. 同図において、21は透明なガラス基板である。 In the figure, 21 is a transparent glass substrate. 該ガラス基板21の表面には、真空蒸着法を用いて、有機色素としてキナクリドン誘導体を添加したALQ3 物質からなるPL発光層22が形成されている。 On the surface of the glass substrate 21, by vacuum evaporation, PL light emitting layer 22 made of ALQ3 substance added quinacridone derivative is formed as an organic dye. また、ガラス基板21の裏面には、ITO透明電極23、ZnO(酸化亜鉛)膜24及びIn背面電極25が、真空蒸着法により順次積層されている。 Further, the back surface of the glass substrate 21, ITO transparent electrode 23, ZnO (zinc oxide) film 24 and In back electrode 25 are sequentially laminated by vacuum evaporation.

【0017】上記の有機PL素子においては、ITO電極23とZnO膜24との界面にショットキー接合(障壁)が存在する。 In the above organic PL element interface Schottky junction between the ITO electrode 23 and the ZnO film 24 (barrier) exists. 該接合に順方向バイアスを印加すると、接合付近のZnO側に伸びた空乏層中で紫外線(38 When the joint to apply a forward bias, ultraviolet in the depletion layer extending in the ZnO side of the vicinity of the junction (38
0nm )が発生する。 0nm) occurs. この紫外線はガラス基板21を透過してPL発光層22を励起するため、PL発光層22から緑色(540nm )の可視光が放射される。 The ultraviolet rays for exciting the PL light emitting layer 22 passes through the glass substrate 21, a visible light of green (540 nm) is emitted from the PL light emitting layer 22. このように、 in this way,
紫外線でPL発光層22を励起しているので、従来のE Since excite the PL light emitting layer 22 with ultraviolet light, conventional E
L素子のようなジュール熱による劣化が回避され、より長い寿命を得ることができる。 Degradation due to Joule heat, such as L element is avoided, it is possible to obtain a longer life.

【0018】なお、上記実施例においては、ショットキー接合構造を有するZnO紫外線発光素子をもちいて有機PL素子を実現したが、例えばpn接合やMOS接合などの構造を有する固体紫外線発光素子を用いても、同様にして緑色発光の有機PL素子を実現することができる。 [0018] In the above embodiment has been realized organic PL element using a ZnO ultraviolet light emitting element having a Schottky junction structure, for example, using a solid ultraviolet light emitting devices having a structure such as a pn junction or MOS junction also, it is possible to realize an organic PL device which emits green light in the same manner. また、PL発光層22にドープする有機色素の種類を変えることによって、緑色以外の発光を得ることも可能である。 Further, by changing the type of the organic dye for doping the PL light emitting layer 22, it is possible to obtain light emission other than green. 更に、紫外線発光素子に印加する電圧或いは電流量を制御するようにすれば、PL発光層22からの発光量を制御することも可能である。 Furthermore, if to control the voltage or current amount applied to the ultraviolet light emitting element, it is possible to control the amount of light emitted from the PL light emitting layer 22. <第2実施例> <Second Embodiment>

【0019】図3は、本発明のPL発光素子を用いたフルカラーディスプレイ装置の構造を示している。 [0019] FIG. 3 shows the structure of a full color display device using a PL light-emitting device of the present invention. 同図において、31は透明なガラス基板である。 In the figure, 31 is a transparent glass substrate. ガラス基板3 Glass substrate 3
1の表面には、青色PL発光層(アセトラン)32、緑色PL発光層(ALQ3 )33および赤色PL発光層(ジシアノメチレンピラン誘導体)34が、マトリックス状に配置して形成されている。 The first surface, the blue PL emission layer (Asetoran) 32, a green PL emission layer (Alq3) 33 and the red PL light emitting layer (dicyanomethylenepyran derivatives) 34 is formed by arranging in a matrix. 一方、基板31の裏面には、夫々のPL発光層32〜34に対応する位置に、 On the other hand, on the back surface of the substrate 31, at a position corresponding to the PL light emitting layer 32 to 34 of each,
紫外線発光素子35,36,37が形成されている。 Ultraviolet light emitting devices 35, 36, 37 are formed.

【0020】上記実施例のカラーディスプレイ装置では、紫外線発光素子35〜36を選択し且つその紫外線発光量を制御することにより、任意の位置において、 [0020] In the color display device of the above embodiment, by controlling the selecting and the ultraviolet light emission amount ultraviolet light emitting element 35-36, at any position,
青、緑および/または赤の発光を選択的に得ることができ、従ってフルカラーでの表示が可能となる。 Blue, green and / or the emission of red can be selectively obtained, thus it is possible to display in full color. この実施例においても、各PL発光層32〜34は何れも熱による劣化が回避されるから、従来のEL素子よりも長い寿命を得ることができる。 Also in this embodiment, since both the PL light emitting layer 32 to 34 thermal degradation is avoided, it is possible to obtain a longer life than the conventional EL elements. <第3実施例> <Third embodiment>

【0021】図4は、本発明のPL素子を液晶ディスプレイのバックライトに応用した例を示している。 [0021] Figure 4 shows an example of the PL device of the present invention is applied to a backlight of a liquid crystal display. 同図において、41は紫外線に対して透明なガラス基板である。 In the figure, 41 is a transparent glass substrate to ultraviolet light. 該ガラス基板41の片面には、第1実施例におけると同様の紫外線発光素子42が設けられている。 The one side of the glass substrate 41, the same ultraviolet light-emitting element 42 as in the first embodiment are provided. また、 Also,
ガラス基板41の他面には、第2実施例で用いたのと同様の、青色PL発光層43、緑色PL発光層44および赤色PL発光層45が積層されている。 On the other surface of the glass substrate 41, similar to that used in the second embodiment, the blue PL emission layer 43, a green PL light emitting layer 44 and the red PL light emitting layer 45 is laminated.

【0022】上記のように構成されたPL発光素子の上には、図示のように、液晶ディスプレイ装置50が積層されている。 [0022] On the configured PL light emitting element as described above, as shown, the liquid crystal display device 50 are laminated. 液晶ディスプレイ装置50は、第一のガラス基板51および第二のガラス基板52を具備している。 The liquid crystal display device 50 includes a first glass substrate 51 and the second glass substrate 52. ガラス基板51の片面には偏光板53が積層され、 On one surface of the glass substrate 51 is a polarizing plate 53 is laminated,
他面には透明電極54と、カラーフィルター55と、配向膜56が順次積層されている。 A transparent electrode 54 on the other side, a color filter 55, an alignment film 56 are sequentially stacked. また、ガラス基板52 Further, the glass substrate 52
の片面には偏光板57が積層され、他面には透明電極5 On one side of the polarizing plate 57 is laminated, the other surface transparent electrode 5
8および配向膜59が順次積層されている。 8 and an alignment film 59 are sequentially laminated. そして、二つの配向膜56,59の間には液晶物質60が充填されることにより、液晶表示セルが構成されている。 Further, between the two alignment films 56, 59 by the liquid crystal material 60 is filled, the liquid crystal display cell is formed.

【0023】上記実施例においては、三原色のPL発光層43〜45の夫々が紫外線発光素子42からの紫外線で励起されて発光し、これら三原色は混ざり合って白色光となる。 [0023] In the above embodiment, ultraviolet is excited to emit light from each ultraviolet light emitting element 42 of the three primary colors of PL light emitting layer 43 to 45, the primary colors become intermingled white light. こうして得られた白色光は、液晶ディスプレイ装置50のバックライトとして、第一のガラス基板5 The resulting white light is thus, as a backlight of a liquid crystal display device 50, the first glass substrate 5
1を通して照射される。 It is irradiated through 1. この実施例においても、PL発光層43〜45の劣化を回避でき、その寿命を長くすることができる。 Also in this embodiment, can avoid degradation of the PL light-emitting layer 43 to 45, it can be prolonged its life.

【0024】なお、この実施例のように、本発明のPL [0024] Incidentally, as in this example, PL of the present invention
発光素子をバックライトとして用いる場合には、紫外線発光素子42の代わりに、例えばγ線を放射する物質のような放射性物質をガラス管に封入して用いることにより、白色光のバックライトで液晶ディスプレイ装置50 In the case of using a light emitting device as a backlight, instead of the ultraviolet light-emitting element 42, by using enclosed in a glass tube radioactive substances such as substances that emit example γ-rays, a liquid crystal display backlight white light 50
を常時照射することも可能である。 It is also possible to irradiate all the time.

【0025】 [0025]

【発明の効果】以上詳述したように、本発明のPL素子によれば、従来のEL素子のようなジュール熱による有機色素の劣化を回避することができ、寿命の長い発光素子を得ることができる。 As described above in detail, according to the PL device of the present invention, it is possible to avoid the deterioration of the organic dye due to Joule heat as in the conventional EL devices, to obtain a long-lifetime light-emitting element can.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による有機ホトルミネッセンス素子の構造を概念的に示す図。 Structure diagram conceptually showing the organic photoluminescence device according to the invention; FIG.

【図2】本発明の一実施例になる有機ホトルミネッセンス素子の構造示す断面図。 2 is a cross-sectional view showing the structure of an organic photoluminescence device according to one embodiment of the present invention.

【図3】本発明の有機ホトルミネッセンス素子を、フルカラーディスプレイ装置に応用した実施例を示す断面図。 The organic photoluminescence device of the present invention; FIG sectional view showing an example of an application to a full color display device.

【図4】本発明の有機ホトルミネッセンス素子を、液晶ディスプレイのバックライトに応用した実施例を示す断面図 The organic photoluminescence device of the present invention; FIG sectional view showing an example of an application to a backlight of a liquid crystal display

【図5】従来のEL素子の構造を示す断面図。 Figure 5 is a sectional view showing a structure of a conventional EL element.

【符号の説明】 DESCRIPTION OF SYMBOLS

11,21,31,41…透明ガラス基板、12,2 11, 21, 31, 41 ... transparent glass substrate, 12, 2
2,32〜34…有機PL発光層、13,35〜37, 2,32~34 ... organic PL light-emitting layer, 13,35~37,
42…紫外線発光素子、23…透明電極、24…ZnO 42 ... ultraviolet light emitting element, 23 ... transparent electrode, 24 ... ZnO
紫外線発光層、25…背面電極 Ultraviolet light emitting layer, 25 ... rear electrode

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 紫外線に対して透明な基板と、該基板の表面に設けられた発光性有機材料層と、前記基板の裏面に設けられた可視光よりも光子エネルギーの大きい電磁波を放射する固体素子とを具備したことを特徴とする有機ホトルミネッセンス素子。 [Claim 1] and the substrate transparent to ultraviolet light, a solid that emits a luminescent organic material layer provided on the surface of the substrate, a large electromagnetic photon energy than visible light provided on the back surface of the substrate the organic photoluminescence device characterized by comprising an element.
JP5385393A 1993-03-15 1993-03-15 Organic photoluminescence element Withdrawn JPH06267301A (en)

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