JPH10282466A - Liquid crystal electric charge transporting material and organic light emiiting element - Google Patents
Liquid crystal electric charge transporting material and organic light emiiting elementInfo
- Publication number
- JPH10282466A JPH10282466A JP9086393A JP8639397A JPH10282466A JP H10282466 A JPH10282466 A JP H10282466A JP 9086393 A JP9086393 A JP 9086393A JP 8639397 A JP8639397 A JP 8639397A JP H10282466 A JPH10282466 A JP H10282466A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- electric charge
- light emitting
- organic light
- discotic liquid
- 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.)
- Granted
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims description 16
- 239000004985 Discotic Liquid Crystal Substance Substances 0.000 claims abstract description 37
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000009897 systematic effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 44
- 239000010408 film Substances 0.000 description 23
- 230000037230 mobility Effects 0.000 description 19
- 239000000758 substrate Substances 0.000 description 18
- 229920001721 polyimide Polymers 0.000 description 7
- 239000004642 Polyimide Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007740 vapor deposition Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000012044 organic layer Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- APLQAVQJYBLXDR-UHFFFAOYSA-N aluminum quinoline Chemical compound [Al+3].N1=CC=CC2=CC=CC=C12.N1=CC=CC2=CC=CC=C12.N1=CC=CC2=CC=CC=C12 APLQAVQJYBLXDR-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- XUGANSMMMYTZPV-UHFFFAOYSA-N 2,3,6,7,10,11-hexakis(hexylsulfanyl)triphenylene Chemical group C12=CC(SCCCCCC)=C(SCCCCCC)C=C2C2=CC(SCCCCCC)=C(SCCCCCC)C=C2C2=C1C=C(SCCCCCC)C(SCCCCCC)=C2 XUGANSMMMYTZPV-UHFFFAOYSA-N 0.000 description 1
- 101000643890 Homo sapiens Ubiquitin carboxyl-terminal hydrolase 5 Proteins 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 102100021017 Ubiquitin carboxyl-terminal hydrolase 5 Human genes 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- -1 p-phenylenevinylene Chemical group 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 229920000553 poly(phenylenevinylene) Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
- 125000005580 triphenylene group Chemical group 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
- Liquid Crystal Substances (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶電荷輸送材料
と、大型ディスプレイ素子を駆動する有機薄膜トランジ
スタを用いた大型液晶素子に関し、この有機薄膜トラン
ジスタを用いた大型の有機発光素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal charge transporting material and a large liquid crystal device using an organic thin film transistor for driving a large display device, and to a large organic light emitting device using the organic thin film transistor.
【０００２】[0002]
【従来の技術】近年、有機発光素子は薄型で自発光型の
表示素子として期待され、実用化レベルに到達しつつあ
る。有機発光素子は1987年のTang等の提案によって電荷
輸送層と電荷発生層との２層構造を採用し、その性能を
著しく向上させることに成功した。それぞれの有機層を
低分子の蒸着層によって数百オングストロームと薄く形
成することで駆動電圧を下げ、同時に発光効率を向上さ
せた。またその後の取り組みによって有機物特有の寿命
の課題も克服されつつある。2. Description of the Related Art In recent years, organic light-emitting devices are expected to be thin and self-luminous display devices, and are reaching practical use levels. As proposed by Tang et al. In 1987, the organic light-emitting device adopted a two-layer structure of a charge transport layer and a charge generation layer, and succeeded in significantly improving the performance thereof. By forming each organic layer as thin as several hundred angstroms by using a low molecular vapor deposition layer, the driving voltage was lowered and at the same time the luminous efficiency was improved. In addition, subsequent efforts have overcome the problem of life span unique to organic matter.
【０００３】上記した基本構成の電荷輸送材料と発光材
料の有機材料開発も盛んであるが、前者はキャリア移動
度の大きな材料が、後者は発光効率の大きな材料と発光
波長が可視域で選択できることが望まれる。特に高輝度
で且つ長寿命を満足させるためにも高移動度材料が望ま
れる。一方、有機発光素子の製造方法において、数百オ
ングストロームの有機層を蒸着方法によって大面積に成
膜することが最も困難なプロセスである。この有機発光
素子の駆動は通常、十数Ｖで行われるが、ピンホール等
の欠陥は致命的となる。[0003] The development of organic materials for the charge transporting material and the light emitting material having the above-mentioned basic constitution is also actively pursued. Is desired. In particular, a high mobility material is desired in order to satisfy high luminance and long life. On the other hand, in a method for manufacturing an organic light emitting device, it is the most difficult process to form an organic layer of several hundred angstroms over a large area by a vapor deposition method. The driving of the organic light emitting device is usually performed at a voltage of more than ten volts, but a defect such as a pinhole is fatal.
【０００４】D.Adam等は1994年にディスコチック液晶が
高い電荷移動度を有することを報告した（「ネイチャ
ー」（NATURE、Vol371、P.141〜143、1994年））。彼ら
が用いた液晶は、2,3,6,7,10,11−hexahexylthiotriphe
nyleneであり、ヘリカル柱状相：Ｈ相（helical colum
nar phase）において移動度μ〜０．１cm2/V・ｓを確認
している。この移動度は印加電界強度が２×104Ｖ/ｃｍ
と低い。以前よりアントラセン等の縮合多環系の有機単
結晶が高い移動度を有することは知られていた。D. Adam et al. Reported in 1994 that discotic liquid crystals have high charge mobility ("Nature" (Nature, Vol 371, pp. 141-143, 1994)). The liquid crystal they used was 2,3,6,7,10,11-hexahexylthiotriphe
nylene, helical columnar phase: H phase (helical colum)
In the nar phase), the mobility μ to 0.1 cm 2 / V · s has been confirmed. The mobility is such that the applied electric field strength is 2 × 10 4 V / cm
And low. It has been known that condensed polycyclic organic single crystals such as anthracene have high mobility.
【０００５】またアモルファス状態であっても移動度が
高い分子が、有機感光体材料の電荷輸送材料として数多
く合成された。表示素子の光変調材料である液晶が、そ
の相構造によって高移動度を持つことを初めて報告し
た。彼らは、その高移動度の実現はディスコチック液晶
がＨ相でカラム構造の柱に沿ってトリフェニレン単位で
スタックし（隣接間距離３．６４オングストローム）、
π軌道が重なることが重要であるとしている。またＨ相
より高温側から冷却することでより秩序の整ったＨ相が
形成されることも上げている。[0005] Many molecules having high mobility even in an amorphous state have been synthesized as charge transport materials for organic photoreceptor materials. We have reported for the first time that liquid crystals, which are light modulation materials for display devices, have high mobility due to their phase structure. They realize that the high mobility is achieved by discotic liquid crystals stacked in triphenylene units along the columns of the column structure in the H phase (adjacent distance 3.64 Å),
It is important that the π orbitals overlap. It is also mentioned that a more ordered H phase is formed by cooling from a higher temperature side than the H phase.
【０００６】[0006]
【発明が解決しようとする課題】発光素子、受光素子を
はじめ有機機能デバイスにとって電荷輸送層の移動度の
向上が最大の課題である。これによって発光効率、受光
効率、寿命といった基本性能の著しい向上が期待でき
る。また駆動電圧も減少する。高移動度の有機層を得る
には、分子の並びが良いことが条件としてある。さらに
隣接分子間の軌道重なりが大きく、π電子系が広がるこ
とが望ましい。有機単結晶は理想的な形態であるが、大
面積化が困難でありデバイス応用に課題がある。液晶相
は分子の秩序がある程度整った形態であり、近年の液晶
表示素子が示すように大面積のデバイス対応が十分可能
である。ディスコチック液晶は柱構造の中央に大きなπ
電子系を有することで柱に沿って電荷移動のパスが形成
される。さらに大きな移動度を実現させるには、Ｈ相に
おける秩序を向上させることである。The most important issue for organic functional devices such as light emitting elements and light receiving elements is to improve the mobility of the charge transport layer. As a result, remarkable improvements in basic performance such as light emission efficiency, light reception efficiency, and life can be expected. Also, the driving voltage decreases. In order to obtain an organic layer having a high mobility, it is a condition that the arrangement of molecules is good. Further, it is desirable that the orbital overlap between adjacent molecules is large and the π-electron system is widened. Although the organic single crystal is an ideal form, it is difficult to increase the area, and there is a problem in device application. The liquid crystal phase is in a form in which the order of molecules is adjusted to some extent, and as shown by a recent liquid crystal display element, it is possible to sufficiently cope with a device having a large area. The discotic liquid crystal has a large π in the center of the pillar structure.
By having an electron system, a path for charge transfer is formed along the pillar. To achieve even higher mobility, the order in the H phase must be improved.
【０００７】[0007]
【課題を解決するための手段】電荷輸送層を正の誘電異
方性をもったディスコチック液晶から構成する。ディス
コチック液晶を一対の配向膜層によって挟み電荷輸送層
を形成する。またこれらのディスコチック液晶を電荷輸
送層として発光層と組み合わせることで有機発光素子を
構成する。The charge transport layer is composed of a discotic liquid crystal having a positive dielectric anisotropy. A discotic liquid crystal is sandwiched between a pair of alignment film layers to form a charge transport layer. An organic light-emitting device is formed by combining these discotic liquid crystals as a charge transport layer with a light-emitting layer.
【０００８】[0008]
【発明の実態の形態】以下、本発明の実施の形態につい
て、図１から図４を用いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
【０００９】（実施の形態１）図１は本発明の正の誘電
異方性をもったディスコチック液晶を電荷輸送層とする
有機発光素子の断面を示す。図１において、１はガラス
を代表とする電気絶縁性基板であり、フィルム形状基板
であっても良い。２は対向電極のストライプ形状電極で
あり、例えばマグネシウム・銀を用いる。３は正の誘電
異方性をもったディスコチック液晶であり、電荷輸送層
を形成する。４は有機発光層であり、アルミニウムウ・
キノリンを代表とする低分子の蒸着層かあるいはポリ−
ｐ−フェニレンビニレン（ＰＰＶ）を代表とする高分子
層を用いる。また、ポリイミド発光層としてＵＳＰ５，
３３１，１８２の材料を用いてもよい。５はもう一方の
ストライプ形状電極であり、インジウム錫酸化物（ＩＴ
Ｏ）を代表とする。さらに６は液晶層の膜厚を制御する
ためのスペーサーである。(Embodiment 1) FIG. 1 shows a cross section of an organic light emitting device of the present invention using a discotic liquid crystal having a positive dielectric anisotropy as a charge transport layer. In FIG. 1, reference numeral 1 denotes an electrically insulating substrate represented by glass, which may be a film-shaped substrate. Reference numeral 2 denotes a stripe-shaped electrode serving as a counter electrode, for example, magnesium / silver is used. Reference numeral 3 denotes a discotic liquid crystal having a positive dielectric anisotropy, which forms a charge transport layer. 4 is an organic light emitting layer,
Low molecular vapor deposition layer represented by quinoline or poly-
A polymer layer represented by p-phenylenevinylene (PPV) is used. USP5 as a polyimide light emitting layer
331 and 182 may be used. Reference numeral 5 denotes another stripe-shaped electrode, which is formed of indium tin oxide (IT
O) as a representative. Reference numeral 6 denotes a spacer for controlling the thickness of the liquid crystal layer.
【００１０】ディスコチック液晶の膜中を電荷を移動さ
せるのに電圧を印加する時、その誘電異方性の極性によ
って移動度が異なる。その原理を図４に示す。ディスコ
チック液晶が正の誘電異方性を持つ場合は、電圧印加状
態で分子は柱の軸を電圧印加方向に揃えることになる。
従ってより秩序だった電荷移動のパスが液晶層内に形成
され、移動度が大幅に増加する。一方、ディスコチック
液晶が負の誘電異方性を持つ場合は、電圧印加状態で分
子は柱の軸が斜めに傾くことになり、秩序だった電荷移
動のパスが形成されない。従って移動度は減少する。When a voltage is applied to move a charge in a discotic liquid crystal film, the mobility varies depending on the polarity of the dielectric anisotropy. The principle is shown in FIG. When the discotic liquid crystal has a positive dielectric anisotropy, the molecules of the molecules align the axes of the columns in the voltage application direction in the voltage application state.
Therefore, a more ordered path of charge transfer is formed in the liquid crystal layer, and the mobility is greatly increased. On the other hand, if the discotic liquid crystal has a negative dielectric anisotropy, the molecules of the molecules will be tilted obliquely in the state of voltage application, and no ordered charge transfer path will be formed. Therefore, the mobility decreases.
【００１１】正の誘電異方性△ｎ＝０．１を持つディス
コチック液晶と負の誘電違法性△ｎ＝−０．０５のディ
スコチック液晶の移動度を、タイム・オブ・フライト法
によって測定評価を行ったところ、前者がμ＝０．２cm
2/V・ｓ、後者がμ＝０．０１cm2/V・ｓと大きく異なっ
た。尚、移動度の測定には膜厚５μｍの液晶層と印加電
圧１０Ｖを用いた。The mobilities of a discotic liquid crystal having a positive dielectric anisotropy Δn = 0.1 and a discotic liquid crystal having a negative dielectric illegality Δn = −0.05 are measured by a time-of-flight method. When the evaluation was performed, the former was μ = 0.2 cm
2 / V · s, and the latter was significantly different from μ = 0.01 cm 2 / V · s. The mobility was measured using a liquid crystal layer having a thickness of 5 μm and an applied voltage of 10 V.
【００１２】図１の有機発光素子を作製するための具体
的な製造方法を次に述べる。 （１）一方の電気絶縁性基板であるガラス基板１（５０
mm×５０mm）上にストライプ形状に幅５００μｍ、ピッ
チ６００μｍの６４本のアルミニウム・マグネシウムの
合金の電極２をマスク蒸着で形成する。Next, a specific manufacturing method for manufacturing the organic light emitting device shown in FIG. 1 will be described. (1) One glass substrate 1 (50) which is an electrically insulating substrate
(mm × 50 mm), 64 aluminum-magnesium alloy electrodes 2 having a width of 500 μm and a pitch of 600 μm are formed in a stripe shape by mask evaporation.
【００１３】（２）他方の電気絶縁性基板であるガラス
基板１にはＩＴＯ電極４を同じくストライプ形状に幅５
００μｍ、ピッチ６００μｍの６４本、フォトリソグラ
フィ技術によって形成する。(2) An ITO electrode 4 is formed on a glass substrate 1, which is the other electrically insulating substrate, in a stripe shape with a width of 5 in the same manner.
64 lines of 00 μm and pitch of 600 μm are formed by photolithography.
【００１４】（３）ＩＴＯ基板上にアルミニウム・キノ
リンを蒸着法によって全面均一に５００オングストロー
ム形成し、発光層４とする。(3) 500 Å of aluminum quinoline is uniformly formed on the ITO substrate by vapor deposition to form a light emitting layer 4.
【００１５】（４）両基板を周辺にシール材料を設けて
５μｍのスペーサー６を介して張り合わせ、ディスコチ
ック液晶を注入することで電荷輸送層３を形成する。(4) Both substrates are provided with a sealing material around them and bonded together via a 5 μm spacer 6, and a discotic liquid crystal is injected to form the charge transport layer 3.
【００１６】以上の方法で製作した有機発光素子を駆動
し、特性評価した。駆動電圧は１０Ｖとした。輝度１万
cd/m2を達成した。The organic light-emitting device manufactured by the above method was driven and its characteristics were evaluated. The driving voltage was 10 V. Brightness 10,000
cd / m 2 was achieved.
【００１７】また全画素とも欠陥は無かった。連続点灯
試験を行ったところ１０００時間経過後も初期の輝度の
９０％以上を維持していた。比較として負の誘電異方性
を持つディスコチック液晶を用いた有機発光素子の場
合、同じ駆動条件でも輝度は〜１００cd/m2と大きく減
少する。There were no defects in all pixels. When a continuous lighting test was performed, 90% or more of the initial luminance was maintained after 1000 hours. As a comparison, in the case of an organic light emitting device using a discotic liquid crystal having a negative dielectric anisotropy, the luminance is greatly reduced to 〜100 cd / m 2 even under the same driving conditions.
【００１８】また１０００時間経過後も５０％程度に輝
度低下が起きる。移動度の減少に伴って発光効率の低下
ばかりでなく界面（発光層と液晶相）に蓄積された電荷
によって電荷注入効率が極度に低下するものと思われ
る。Further, even after 1000 hours, the luminance is reduced to about 50%. It is considered that not only the luminous efficiency is reduced with the decrease in mobility but also the charge injection efficiency is extremely reduced due to the electric charges accumulated at the interface (the luminescent layer and the liquid crystal phase).
【００１９】（実施の形態２）図２は本発明の一対の配
向膜層７によってディスコチック液晶を挟み電荷輸送層
とする有機発光素子の断面を示す。図１と同様に１は電
気絶縁性基板であり、２は対向電極のストライプ形状電
極である。３は正の誘電異方性をもったディスコチック
液晶であり、電荷輸送層を形成する。４は有機発光層で
あり、アルミニウムウ・キノリンを代表とする低分子の
蒸着層かあるいはポリ−ｐ−フェニレンビニレン（ＰＰ
Ｖ）を代表とする高分子層を用いる。(Embodiment 2) FIG. 2 shows a cross section of an organic light emitting device having a charge transport layer sandwiching a discotic liquid crystal between a pair of alignment film layers 7 of the present invention. As in FIG. 1, reference numeral 1 denotes an electrically insulating substrate, and reference numeral 2 denotes a stripe-shaped electrode as a counter electrode. Reference numeral 3 denotes a discotic liquid crystal having a positive dielectric anisotropy, which forms a charge transport layer. Reference numeral 4 denotes an organic light-emitting layer, which is a low-molecular vapor deposition layer represented by aluminum quinoline or poly-p-phenylenevinylene (PP
A polymer layer represented by V) is used.
【００２０】５は、もう一方のストライプ形状電極で、
インジウム錫酸化物（ＩＴＯ）を代表とする透明電極で
ある。さらに６は液晶層の膜厚を制御するためのスペー
サーである。７はディスコチック液晶の配向性を向上さ
せることが目的で導入した配向膜であり、ポリイミドを
代表とする高分子とする。通常の液晶表示素子と同様に
布でその表面を一定方向に擦るラビングを施す。Reference numeral 5 denotes another stripe-shaped electrode.
This is a transparent electrode represented by indium tin oxide (ITO). Reference numeral 6 denotes a spacer for controlling the thickness of the liquid crystal layer. Reference numeral 7 denotes an alignment film introduced for the purpose of improving the alignment of the discotic liquid crystal, which is a polymer represented by polyimide. Rubbing is performed by rubbing the surface with a cloth in the same direction as a normal liquid crystal display element.
【００２１】前記したディスコチック液晶の移動度と同
じ評価方法で、配向膜導入の効果を検討した。正の誘電
異方性△ｎを持つディスコチック液晶を配向膜で挟む
と、その移動度はμ＝０．２cm2/V・ｓから０．５cm2/V・
ｓへと２．５倍増加した。The effect of introducing an alignment film was examined by the same evaluation method as that for the discotic liquid crystal described above. When a discotic liquid crystal having a positive dielectric anisotropy Δn is sandwiched between alignment films, the mobility is μ = 0.2 cm 2 / V · s to 0.5 cm 2 / V ·
to 2.5 s.
【００２２】これは配向膜によって、よりディスコチッ
ク液晶の秩序性が向上したためと考えられる。更にＵＳ
Ｐ５，３３１，１８２の配向膜且つ発光層を兼用できる
ポリイミド材料を用いても、この移動度0.5cm2/V・ｓを
確認した。This is presumably because the ordering of the discotic liquid crystal was further improved by the orientation film. Further US
This mobility of 0.5 cm 2 / V · s was confirmed even when a polyimide material which can also serve as an alignment film and a light emitting layer of P5,331,182 was used.
【００２３】図２の有機発光素子を作製するため、図１
の有機発光素子と同じ工程(1)〜(3)を行う。その後両基
板面に配向膜としてポリイミド膜を約２００オングスト
ローム形成する。レーヨン布を巻いたラビングローラー
によって、両基板の表面のポリイミド膜をラビング処理
する。この後の工程は前記した工程(4)となる。In order to fabricate the organic light emitting device of FIG.
Perform the same steps (1) to (3) as for the organic light emitting device of (1). Thereafter, a polyimide film is formed on both substrate surfaces as an alignment film at about 200 angstroms. The polyimide film on the surfaces of both substrates is rubbed by a rubbing roller wound with rayon cloth. The subsequent step is the above-mentioned step (4).
【００２４】製作した有機発光素子を駆動電圧１０Ｖで
特性評価したところ、輝度３万cd／m2と配向膜７の導入
で３倍増加した。連続点灯も１０００時間経過後で初期
の輝度の９０％以上を維持していた。When the characteristics of the manufactured organic light-emitting device were evaluated at a driving voltage of 10 V, the luminance was increased to 30,000 cd / m 2 and increased three-fold due to the introduction of the alignment film 7. The continuous lighting also maintained 90% or more of the initial luminance after 1000 hours.
【００２５】また別の配向膜材料としてＵＳＰ５，３３
１，１８２の配向膜且つ発光層を兼用できるポリイミド
材料を用いると、デバイス構造と工程は簡略化される。As another alignment film material, USP 5,33
When a polyimide material that can also serve as the light emitting layer and the 1,182 alignment film is used, the device structure and the process are simplified.
【００２６】（実施の形態３）図３は本発明のディスコ
チック液晶の電荷輸送層と高分子発光層と配向膜とマト
リックス状に配置した画素電極及び各画素を駆動するト
ランジスタから構成される１画素あたりの有機発光素子
の断面を示す。電気絶縁性基板１に各画素を駆動するト
ランジスタを形成する。活性半導体層がガラス基板に形
成できるp-Si半導体を用いた場合の素子構成例である。(Embodiment 3) FIG. 3 is a diagram showing a structure in which a charge transport layer of a discotic liquid crystal, a polymer light emitting layer, an alignment film, pixel electrodes arranged in a matrix, and a transistor for driving each pixel according to the present invention. 2 shows a cross section of an organic light emitting element per pixel. A transistor for driving each pixel is formed on the electrically insulating substrate 1. This is an example of an element configuration in the case where a p-Si semiconductor whose active semiconductor layer can be formed on a glass substrate is used.
【００２７】ソース電極８、ドレイン電極９、活性半導
体層１０、ゲート電極１１及びゲート絶縁膜１２が構成
され、層間絶縁膜１５を介してソース電極８はデータ線
１３と、ドレイン電極９は画素電極１４と結合される。
そしてパシベーション膜１６が設けられる。基板面の全
面に配向膜７で覆う。この構成はアクティブマトリック
ス液晶表示素子と全く同じである。対向側の基板のガラ
ス基板１に透明電極５と発光層４を設け、基板間にディ
スコチック液晶３を注入する。尚、発光層４はＵＳＰ
５，３３１，１８２の配向膜且つ発光層を兼用できるポ
リイミド材料を用いる。A source electrode 8, a drain electrode 9, an active semiconductor layer 10, a gate electrode 11 and a gate insulating film 12 are formed. The source electrode 8 is connected to the data line 13 via the interlayer insulating film 15, and the drain electrode 9 is connected to the pixel electrode 14 is combined.
Then, a passivation film 16 is provided. The entire surface of the substrate is covered with an alignment film 7. This configuration is exactly the same as the active matrix liquid crystal display device. A transparent electrode 5 and a light emitting layer 4 are provided on a glass substrate 1 on the opposite side, and a discotic liquid crystal 3 is injected between the substrates. The light emitting layer 4 is made of USP
A polyimide material that can also serve as a light emitting layer and 5,331,182 alignment films is used.
【００２８】試作に用いた基板は表示有効面積が対角
５．０インチで画素数はＳＶＧＡ（８００×６００）と
した。駆動電圧を１０Ｖとして、動画表示を行ったとこ
ろ最大輝度が３万cd／m2で残像のない良好な画像が得ら
れた。The substrate used in the prototype had a display effective area of 5.0 inches diagonally and the number of pixels was SVGA (800 × 600). When the driving voltage was set to 10 V and a moving image was displayed, the maximum luminance was 30,000 cd / m 2 and a good image without an afterimage was obtained.
【００２９】[0029]
【発明の効果】以上のように本発明によれば、高移動度
な電荷輸送層によって、高効率な発光特性と、駆動電圧
の減少による消費電力の減少及び信頼性の向上が達成で
きた。また、製造方法も液晶表示素子と同じ工程が使
え、均一性と高歩留まりが可能となる。As described above, according to the present invention, a high-mobility charge transporting layer achieves high-efficiency light-emitting characteristics, reduced power consumption due to reduced driving voltage, and improved reliability. In addition, the same manufacturing process as that of the liquid crystal display element can be used, and uniformity and high yield can be achieved.
【図１】本発明の実施の形態１によるディスコチック液
晶を電荷輸送層とした有機発光素子の断面図FIG. 1 is a cross-sectional view of an organic light emitting device using a discotic liquid crystal as a charge transport layer according to a first embodiment of the present invention.
【図２】本発明の実施の形態２によるディスコチック液
晶を電荷輸送層とし、配向膜で挟む構造の有機発光素子
の断面図FIG. 2 is a cross-sectional view of an organic light emitting device having a structure in which a discotic liquid crystal is used as a charge transport layer and is sandwiched between alignment films according to a second embodiment of the present invention.
【図３】本発明の実施の形態３によるディスコチック液
晶を電荷輸送層とし、トランジスタ駆動による有機発光
素子の断面図FIG. 3 is a cross-sectional view of an organic light-emitting device driven by a transistor using a discotic liquid crystal as a charge transport layer according to a third embodiment of the present invention.
【図４】正の誘電異方性△ｎを持つディスコチック液晶
と負の誘電異方性△ｎを持つディスコチック液晶の電界
印加時の配向状態を示す原理図FIG. 4 is a principle diagram showing an alignment state of a discotic liquid crystal having a positive dielectric anisotropy Δn and a discotic liquid crystal having a negative dielectric anisotropy Δn when an electric field is applied.
１ 電気絶縁性基板 ２ ストライプ電極 ３ ディスコチック液晶 ４ 有機発光層 ５ 透明電極 ６ スペーサー ７ 配向膜 ８ ソース電極 ９ ドレイン電極 １０ 活性半導体層 １１ ゲート電極 １２ ゲート絶縁膜 １３ データ線 １４ 画素電極 １５ 層間絶縁膜 １６ パッシベーション膜 DESCRIPTION OF SYMBOLS 1 Electrically insulating substrate 2 Stripe electrode 3 Discotic liquid crystal 4 Organic light emitting layer 5 Transparent electrode 6 Spacer 7 Alignment film 8 Source electrode 9 Drain electrode 10 Active semiconductor layer 11 Gate electrode 12 Gate insulating film 13 Data line 14 Pixel electrode 15 Interlayer insulation Film 16 passivation film
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西山 和廣 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuhiro Nishiyama 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.
Claims (6)
晶からなる液晶電荷輸送材料。1. A liquid crystal charge transporting material comprising a discotic liquid crystal having a positive dielectric anisotropy.
ら１０μｍであることを特長とする請求項１記載の液晶
電荷輸送材料。2. The liquid crystal charge transport material according to claim 1, wherein the layer thickness of the discotic liquid crystal is 0.5 μm to 10 μm.
って挟む液晶電荷輸送材料。3. A liquid crystal charge transporting material in which a discotic liquid crystal is sandwiched between a pair of alignment film layers.
よって制限した請求項２記載の液晶電荷輸送材料。4. The liquid crystal charge transport material according to claim 2, wherein the thickness of the discotic liquid crystal is limited by a spacer.
液晶からなる電荷輸送層と、有機発光層からなる有機発
光素子。5. An organic light emitting device comprising at least one pair of electrodes, a charge transport layer made of discotic liquid crystal, and an organic light emitting layer.
に配置されたトランジスタとディスコチック液晶からな
る電荷輸送層と、有機発光層からなる有機発光素子。6. An organic light emitting device comprising at least a pair of electrodes, a transistor arranged in a matrix and a charge transport layer made of discotic liquid crystal, and an organic light emitting layer.
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|---|---|---|---|
| JP08639397A JP3760555B2 (en) | 1997-04-04 | 1997-04-04 | Liquid crystal charge transport materials and organic light emitting devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08639397A JP3760555B2 (en) | 1997-04-04 | 1997-04-04 | Liquid crystal charge transport materials and organic light emitting devices |
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| Publication Number | Publication Date |
|---|---|
| JPH10282466A true JPH10282466A (en) | 1998-10-23 |
| JP3760555B2 JP3760555B2 (en) | 2006-03-29 |
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ID=13885640
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002164177A (en) * | 1999-11-29 | 2002-06-07 | Canon Inc | Liquid crystal element |
| US6733849B2 (en) | 2001-03-23 | 2004-05-11 | Jsr Corporation | High-speed charge transport material, production method thereof, photoelectric conversion device and electroluminescence device |
| KR100453360B1 (en) * | 2001-04-18 | 2004-10-15 | 비오이 하이디스 테크놀로지 주식회사 | Apparatus for Thin Film Transistor Liquid Crystal Display |
| KR100583559B1 (en) * | 1998-10-20 | 2006-10-24 | 삼성전자주식회사 | Electroluminescent type back light source device and liquid crystal display module using the same |
-
1997
- 1997-04-04 JP JP08639397A patent/JP3760555B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100583559B1 (en) * | 1998-10-20 | 2006-10-24 | 삼성전자주식회사 | Electroluminescent type back light source device and liquid crystal display module using the same |
| JP2002164177A (en) * | 1999-11-29 | 2002-06-07 | Canon Inc | Liquid crystal element |
| JP4717198B2 (en) * | 1999-11-29 | 2011-07-06 | キヤノン株式会社 | Organic electroluminescence device |
| US6733849B2 (en) | 2001-03-23 | 2004-05-11 | Jsr Corporation | High-speed charge transport material, production method thereof, photoelectric conversion device and electroluminescence device |
| KR100453360B1 (en) * | 2001-04-18 | 2004-10-15 | 비오이 하이디스 테크놀로지 주식회사 | Apparatus for Thin Film Transistor Liquid Crystal Display |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3760555B2 (en) | 2006-03-29 |
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