JP2019182972A - Organic light emitting material and organic light emitting element - Google Patents

Organic light emitting material and organic light emitting element Download PDF

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JP2019182972A
JP2019182972A JP2018074246A JP2018074246A JP2019182972A JP 2019182972 A JP2019182972 A JP 2019182972A JP 2018074246 A JP2018074246 A JP 2018074246A JP 2018074246 A JP2018074246 A JP 2018074246A JP 2019182972 A JP2019182972 A JP 2019182972A
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稔 山路
Minoru Yamaji
稔 山路
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Gunma University NUC
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Abstract

To provide an organic light emitting material that emits light in a solid state.SOLUTION: The present invention provides an organic light emitting material represented by general formula (1) or general formula (2) (Ris H, an alkyl group or an alkoxy group; X, X, X, X, Xand Xindependently represent H or an alkyl group; Xand X, Xand X, Xand X, and Xand X, independently, may be coupled to each other to form a ring; Ris an alkyl group; X, X, X, X, Xand Xindependently represent H or an alkyl group; Xand X, Xand X, Xand X, Xand X, independently, may be coupled to each other to form a ring).SELECTED DRAWING: None

Description

本発明は、有機発光材料及び有機発光素子に関する。   The present invention relates to an organic light emitting material and an organic light emitting element.

有機発光素子は、柔軟で軽量な次世代のディスプレイ及び照明として、開発が進められている。有機発光素子とは、有機発光材料に対し、電気エネルギーを与えて励起させ、励起状態から失活する際のエネルギーを光として取り出す発光素子を表す。   Organic light emitting devices are being developed as next generation displays and lighting that are flexible and lightweight. An organic light-emitting element is a light-emitting element that is excited by applying electric energy to an organic light-emitting material and takes out energy when deactivated from an excited state as light.

有機発光材料としては、溶液状態において高い発光量子収率を示す芳香族化合物が知られている。溶液状態において高い発光量子収率を示す芳香族化合物としては、例えば、フェナントレン骨格を有するボロン−ジケトン錯体が知られている(例えば、特許文献1及び非特許文献1〜2参照)。   As an organic light emitting material, an aromatic compound showing a high light emission quantum yield in a solution state is known. For example, a boron-diketone complex having a phenanthrene skeleton is known as an aromatic compound that exhibits a high emission quantum yield in a solution state (see, for example, Patent Document 1 and Non-Patent Documents 1 and 2).

特願2017−545458Japanese Patent Application No. 2017-545458

Mamiya. et al. Photochem.Photobiol.Sci., 15, 278 (2016).Mamiya. Et al. Photochem. Photobiol. Sci., 15, 278 (2016). Mamiya. et al. Photochem.Photobiol.Sci., 15, 928 (2016).Mamiya. Et al. Photochem. Photobiol. Sci., 15, 928 (2016).

有機発光材料を、上述の有機発光素子の発光層として使用するには、固体状態において発光することが求められる。しかしながら、従来の有機発光材料は、溶液状態において発光を示す材料こそ多く報告されているが、固体状態において発光を示す材料には限りがあった。そこで、本発明の課題は、固体状態で発光する有機発光材料を提供することとする。   In order to use the organic light emitting material as the light emitting layer of the above organic light emitting element, it is required to emit light in a solid state. However, many conventional organic light-emitting materials have been reported as materials that emit light in a solution state, but the materials that emit light in a solid state are limited. Accordingly, an object of the present invention is to provide an organic light emitting material that emits light in a solid state.

上記課題は、以下の手段により解決される。   The above problem is solved by the following means.

<1> 一般式(1)又は一般式(2)で表される有機発光材料。 <1> An organic light-emitting material represented by the general formula (1) or the general formula (2).

(一般式(1)中、R10は水素原子、アルキル基又はアルコキシ基を表す。X10、X11、X12、X13、X14及びX15は、各々独立に、水素原子又はアルキル基を表す。X10及びX11、X12及びX13、X13及びX14、並びにX14及びX15は、各々独立に、互いに連結して環を形成してもよい。
一般式(2)中、R20はアルキル基を表す。X20、X21、X22、X23、X24及びX25は、各々独立に、水素原子又はアルキル基を表す。X20及びX21、X22及びX23、X23及びX24、並びにX24及びX25は、各々独立に、互いに連結して環を形成してもよい。)
(In the general formula (1), R 10 represents a hydrogen atom, an alkyl group or an alkoxy group. X 10 , X 11 , X 12 , X 13 , X 14 and X 15 are each independently a hydrogen atom or an alkyl group. X 10 and X 11 , X 12 and X 13 , X 13 and X 14 , and X 14 and X 15 may be independently connected to each other to form a ring.
In General Formula (2), R 20 represents an alkyl group. X 20 , X 21 , X 22 , X 23 , X 24 and X 25 each independently represent a hydrogen atom or an alkyl group. X 20 and X 21 , X 22 and X 23 , X 23 and X 24 , and X 24 and X 25 may be independently connected to each other to form a ring. )

<2> 前記一般式(2)において、R20が炭素数1以上5以下の低級アルキル基を表し、X20、X21、X22、X23、X24及びX25は水素原子を表す有機発光材料である前記<1>に記載の有機発光材料。 <2> In the general formula (2), R 20 represents a lower alkyl group having 1 to 5 carbon atoms, and X 20 , X 21 , X 22 , X 23 , X 24, and X 25 represent organic atoms. The organic light-emitting material according to <1>, which is a light-emitting material.

<3> 前記一般式(1)において、R10が水素原子、炭素数1以上5以下の低級アルキル基、又は炭素数1以上6以下の低級アルコキシ基を表し、X10、X11、X12、X13、X14及びX15は水素原子を表す有機発光材料である前記<1>又は<2>に記載の有機発光材料。 <3> In the general formula (1), R 10 represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, or a lower alkoxy group having 1 to 6 carbon atoms, and X 10 , X 11 , X 12 , X 13 , X 14 and X 15 are organic light-emitting materials according to the above <1> or <2>, which are organic light-emitting materials representing hydrogen atoms.

<4> 前記<1>〜<3>に記載の有機発光材料を含む有機発光素子。 <4> An organic light-emitting device comprising the organic light-emitting material according to <1> to <3>.

<1>、<2>又は<3>に記載の発明によれば、固体状態で発光する有機発光材料が提供される。 According to the invention described in <1>, <2>, or <3>, an organic light emitting material that emits light in a solid state is provided.

<4>に記載の発明によれば、固体状態で発光する有機発光材料を用いた有機発光素子が提供される。 According to the invention described in <4>, an organic light-emitting device using an organic light-emitting material that emits light in a solid state is provided.

例示化合物2−1のH−NMRスペクトルを示すグラフである。It is a graph showing 1 H-NMR spectrum of the exemplified compound 2-1. 実施例1〜実施例4の溶液状態における紫外可視吸収スペクトル及び発光スペクトルを示すグラフである。It is a graph which shows the ultraviolet visible absorption spectrum and emission spectrum in the solution state of Example 1- Example 4. 実施例1〜実施例4の固体状態における発光スペクトルを示すグラフである。It is a graph which shows the emission spectrum in the solid state of Example 1- Example 4.

以下、本発明の実施形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

発光材料とは、可視領域の波長において発光スペクトルを測定したときにピーク強度を示す材料を表す。   A luminescent material refers to a material that exhibits peak intensity when an emission spectrum is measured at a wavelength in the visible region.

本実施形態に係る有機発光材料は、一般式(1)又は一般式(2)で表される構造を有する。   The organic light emitting material according to the present embodiment has a structure represented by the general formula (1) or the general formula (2).

一般式(1)中、R10は水素原子、アルキル基又はアルコキシ基を表す。X10、X11、X12、X13、X14及びX15は、各々独立に、水素原子又はアルキル基を表す。X10及びX11、X12及びX13、X13及びX14、並びにX14及びX15は、各々独立に、互いに連結して環を形成してもよい。 In general formula (1), R 10 represents a hydrogen atom, an alkyl group or an alkoxy group. X 10 , X 11 , X 12 , X 13 , X 14 and X 15 each independently represent a hydrogen atom or an alkyl group. X 10 and X 11 , X 12 and X 13 , X 13 and X 14 , and X 14 and X 15 may be independently connected to each other to form a ring.

一般式(2)中、R20はアルキル基を表す。X20、X21、X22、X23、X24及びX25は、各々独立に、水素原子又はアルキル基を表す。X20及びX21、X22及びX23、X23及びX24、並びにX24及びX25は、各々独立に、互いに連結して環を形成してもよい。 In General Formula (2), R 20 represents an alkyl group. X 20 , X 21 , X 22 , X 23 , X 24 and X 25 each independently represent a hydrogen atom or an alkyl group. X 20 and X 21 , X 22 and X 23 , X 23 and X 24 , and X 24 and X 25 may be independently connected to each other to form a ring.

従来における、有機発光材料は、溶液状態においてこそ発光を示すが、固体状態において発光を示すものは、限られていた。
一方、一般式(1)及び一般式(2)で表される有機発光材料(以下、「特定有機発光材料」とも称す)は、溶液状態及び固体状態において発光する性質を有する。そのため、特定有機発光材料は、固体状態において発光を示すことが求められる素子や材料等に利用できる。より具体的に、例えば、有機発光素子、発光センサ、分析用環境指示薬(医療診断用発光プローブ、発光レセプター等)、光学フィルタ、発光性着色材料、等に用いられる。中でも、固体状態における発光特性が求められる有機発光素子における発光層に好適に用いられる。
Conventional organic light emitting materials emit light only in a solution state, but those that emit light in a solid state are limited.
On the other hand, the organic light emitting materials represented by the general formulas (1) and (2) (hereinafter also referred to as “specific organic light emitting materials”) have a property of emitting light in a solution state and a solid state. Therefore, the specific organic light-emitting material can be used for an element or material that is required to emit light in a solid state. More specifically, for example, it is used for organic light emitting devices, light emitting sensors, environmental indicators for analysis (light emitting probes for medical diagnosis, light emitting receptors, etc.), optical filters, luminescent coloring materials, and the like. Especially, it is used suitably for the light emitting layer in the organic light emitting element by which the light emission characteristic in a solid state is calculated | required.

[特定有機発光材料]
本実施形態に係る特定有機発光材料は、一般式(1)又は一般式(2)で表される構造を有する。
より具体的に、一般式(1)で表される有機発光材料は、ナフタレンの1位にヒドロキシ基が置換したナフトール骨格を有する。一般式(2)で表される有機発光材料は、ナフタレンの1位に置換する酸素原子と、2位に置換するケト基の酸素原子とが、ジフロロボランのホウ素原子に結合した構造を有する。
[Specific organic light-emitting materials]
The specific organic light emitting material according to the present embodiment has a structure represented by the general formula (1) or the general formula (2).
More specifically, the organic light-emitting material represented by the general formula (1) has a naphthol skeleton in which a hydroxy group is substituted at the 1-position of naphthalene. The organic light-emitting material represented by the general formula (2) has a structure in which an oxygen atom substituted at the 1-position of naphthalene and an oxygen atom of a keto group substituted at the 2-position are bonded to a boron atom of difluoroborane.

(R10
一般式(1)中、R10は水素原子、アルキル基又はアルコキシ基を表す。
(R 10 )
In general formula (1), R 10 represents a hydrogen atom, an alkyl group or an alkoxy group.

一般式(1)中、R10で表されるアルキル基としては、例えば、炭素数1以上10以下の直鎖状のアルキル基及び炭素数3以上10以下の分岐状のアルキル基が挙げられる。 In the general formula (1), examples of the alkyl group represented by R 10 include a linear alkyl group having 1 to 10 carbon atoms and a branched alkyl group having 3 to 10 carbon atoms.

炭素数1以上10以下の直鎖状のアルキル基としては、例えば、メチル基、エチル基、n−プロピル基、n−ブチル基、n−ペンチル基、n−ヘキシル基、n−ヘプチル基、n−オクチル基、n−ノニル基、n−デシル基等が挙げられる。
炭素数3以上10以下の分岐状のアルキル基としては、例えば、イソプロピル基、イソブチル基、sec−ブチル基、tert−ブチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基、イソヘキシル基、sec−ヘキシル基、tert−ヘキシル基、イソヘプチル基、sec−ヘプチル基、tert−ヘプチル基、イソオクチル基、sec−オクチル基、tert−オクチル基、イソノニル基、sec−ノニル基、tert−ノニル基、イソデシル基、sec−デシル基、tert−デシル基等が挙げられる。
Examples of the linear alkyl group having 1 to 10 carbon atoms include, for example, methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n -An octyl group, n-nonyl group, n-decyl group, etc. are mentioned.
Examples of the branched alkyl group having 3 to 10 carbon atoms include isopropyl group, isobutyl group, sec-butyl group, tert-butyl group, isopentyl group, neopentyl group, tert-pentyl group, isohexyl group, sec-hexyl. Group, tert-hexyl group, isoheptyl group, sec-heptyl group, tert-heptyl group, isooctyl group, sec-octyl group, tert-octyl group, isononyl group, sec-nonyl group, tert-nonyl group, isodecyl group, sec -A decyl group, a tert- decyl group, etc. are mentioned.

上記の中でも、一般式(1)中、R10で表されるアルキル基としては、メチル基、エチル基等の炭素数1以上5以下の低級アルキル基であることが好ましい。 Among the above, in the general formula (1), the alkyl group represented by R 10 is preferably a lower alkyl group having 1 to 5 carbon atoms such as a methyl group or an ethyl group.

一般式(1)中、R10で表されるアルコキシ基としては、例えば、芳香族アルコキシ基及び脂肪族アルコキシ基が挙げられる。 In the general formula (1), examples of the alkoxy group represented by R 10 include an aromatic alkoxy group and an aliphatic alkoxy group.

芳香族アルコキシ基としては、例えば、炭素数1以上14以下の芳香族アルコキシ基が挙げられる。   Examples of the aromatic alkoxy group include aromatic alkoxy groups having 1 to 14 carbon atoms.

炭素数1以上14以下の芳香族アルコキシ基としては、例えば、フェノキシ基、1−ナフチルオキシ基、1−フェナンチルオキシ基、1−アントラチルオキシ基、2−ピリジルオキシ基、2−フラニルオキシ基等が挙げられる。   Examples of the aromatic alkoxy group having 1 to 14 carbon atoms include phenoxy group, 1-naphthyloxy group, 1-phenanthyloxy group, 1-anthracyloxy group, 2-pyridyloxy group, and 2-furanyloxy group. Etc.

脂肪族アルコキシ基としては、例えば、炭素数1以上14以下の直鎖状、又は炭素数3以上14以下の分岐状のアルコキシ基が挙げられる。   As an aliphatic alkoxy group, a C1-C14 linear or a C3-C14 branched alkoxy group is mentioned, for example.

炭素数1以上14以下の直鎖状のアルコキシ基としては、例えば、メトキシ基、エトキシ基、n−プロポキシ基、n−ブトキシ基、n−ペンチルオキシ基、n−ヘキシルオキシ基、n−ヘプチルオキシ基、n−オクチルオキシ基、n−ノニルオキシ基、n−デシルオキシ基等が挙げられる。
炭素数3以上14以下の分岐状のアルコキシ基として具体的には、イソプロポキシ基、イソブトキシ基、sec−ブトキシ基、tert−ブトキシ基、イソペンチルオキシ基、ネオペンチルオキシ基、tert−ペンチルオキシ基、イソヘキシルオキシ基、sec−ヘキシルオキシ基、tert−ヘキシルオキシ基、イソヘプチルオキシ基、sec−ヘプチルオキシ基、tert−ヘプチルオキシ基、イソオクチルオキシ基、sec−オクチルオキシ基、tert−オクチルオキシ基、イソノニルオキシ基、sec−ノニルオキシ基、tert−ノニルオキシ基、イソデシルオキシ基、sec−デシルオキシ基、tert−デシルオキシ基等が挙げられる。
Examples of the linear alkoxy group having 1 to 14 carbon atoms include methoxy group, ethoxy group, n-propoxy group, n-butoxy group, n-pentyloxy group, n-hexyloxy group, and n-heptyloxy. Group, n-octyloxy group, n-nonyloxy group, n-decyloxy group and the like.
Specific examples of the branched alkoxy group having 3 to 14 carbon atoms include isopropoxy group, isobutoxy group, sec-butoxy group, tert-butoxy group, isopentyloxy group, neopentyloxy group, and tert-pentyloxy group. , Isohexyloxy group, sec-hexyloxy group, tert-hexyloxy group, isoheptyloxy group, sec-heptyloxy group, tert-heptyloxy group, isooctyloxy group, sec-octyloxy group, tert-octyloxy Group, isononyloxy group, sec-nonyloxy group, tert-nonyloxy group, isodecyloxy group, sec-decyloxy group, tert-decyloxy group and the like.

上記の中でも、一般式(1)中、R10で表されるアルコキシ基としては、炭素数1以上6以下の低級アルコキシ基であることが好ましい。なお、炭素数1以上6以下の低級アルコキシ基としては、メトキシ基、エトキシ基、フェノキシ基等の炭素数1以上6以下の脂肪族アルコキシ基及び芳香族アルコキシ基(つまりフェノキシ基、2−ピリジルオキシ基、2−フラニルオキシ基等)を表す。 Among the above, in the general formula (1), the alkoxy group represented by R 10 is preferably a lower alkoxy group having 1 to 6 carbon atoms. The lower alkoxy group having 1 to 6 carbon atoms includes an aliphatic alkoxy group having 1 to 6 carbon atoms and an aromatic alkoxy group such as a methoxy group, an ethoxy group, and a phenoxy group (that is, a phenoxy group, 2-pyridyloxy). Group, 2-furanyloxy group and the like.

(X10〜X15
一般式(1)中、X10、X11、X12、X13、X14及びX15は、各々独立に、水素原子又はアルキル基を表す。
(X 10 ~X 15)
In General Formula (1), X 10 , X 11 , X 12 , X 13 , X 14 and X 15 each independently represent a hydrogen atom or an alkyl group.

一般式(1)中、X10〜X15で表されるアルキル基としては、炭素数1以上10以下の直鎖状のアルキル基、炭素数3以上10以下の分岐状のアルキル基が挙げられる。 In general formula (1), examples of the alkyl group represented by X 10 to X 15 include a linear alkyl group having 1 to 10 carbon atoms and a branched alkyl group having 3 to 10 carbon atoms. .

炭素数1以上10以下の直鎖状のアルキル基としては、例えば、メチル基、エチル基、n−プロピル基、n−ブチル基、n−ペンチル基、n−ヘキシル基、n−ヘプチル基、n−オクチル基、n−ノニル基、n−デシル基等が挙げられる。   Examples of the linear alkyl group having 1 to 10 carbon atoms include, for example, methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n -An octyl group, n-nonyl group, n-decyl group, etc. are mentioned.

炭素数3以上10以下の分岐状のアルキル基としては、例えば、イソプロピル基、イソブチル基、sec−ブチル基、tert−ブチル基、イソペンチル基、ネオペンチル基、tert−ペンチル基、イソヘキシル基、sec−ヘキシル基、tert−ヘキシル基、イソヘプチル基、sec−ヘプチル基、tert−ヘプチル基、イソオクチル基、sec−オクチル基、tert−オクチル基、イソノニル基、sec−ノニル基、tert−ノニル基、イソデシル基、sec−デシル基、tert−デシル基等が挙げられる。   Examples of the branched alkyl group having 3 to 10 carbon atoms include isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, neopentyl, tert-pentyl, isohexyl, and sec-hexyl. Group, tert-hexyl group, isoheptyl group, sec-heptyl group, tert-heptyl group, isooctyl group, sec-octyl group, tert-octyl group, isononyl group, sec-nonyl group, tert-nonyl group, isodecyl group, sec -A decyl group, a tert- decyl group, etc. are mentioned.

上記の中でも、一般式(1)中、X10〜X15で表されるアルキル基としては、メチル基、エチル基、プロピル基、ペンチル基、ブチル基等の炭素数1以上5以下の低級アルキル基であることが好ましい。 Among the above, in the general formula (1), the alkyl group represented by X 10 to X 15 is a lower alkyl having 1 to 5 carbon atoms such as a methyl group, an ethyl group, a propyl group, a pentyl group, and a butyl group. It is preferably a group.

一般式(1)中、X10及びX11、X12及びX13、X13及びX14、並びにX14及びX15を、互いに連結して形成される環構造としては、ベンゼン環、及び炭素数10以上18以下の縮合環(例えば、ナフタレン環、アントラセン環、フェナントレン環、クリセン環(ベンゾ[α]フェナントレン環)、テトラセン環、テトラフェン環(ベンゾ[α]アントラセン環)、トリフェニレン環等)などが挙げられる。先述の中でも、形成される環構造としては、ベンゼン環であることが好ましい。 In the general formula (1), X 10 and X 11 , X 12 and X 13 , X 13 and X 14 , and X 14 and X 15 are linked to each other as a ring structure, and a benzene ring and carbon Condensed ring of several tens to 18 or less (for example, naphthalene ring, anthracene ring, phenanthrene ring, chrysene ring (benzo [α] phenanthrene ring), tetracene ring, tetraphen ring (benzo [α] anthracene ring), triphenylene ring, etc.) Etc. Among the preceding statements, the ring structure formed is preferably a benzene ring.

一般式(1)において、R10は、水素原子、炭素数1以上5以下の低級アルキル基、又は炭素数1以上6以下の低級アルコキシ基を表し、X10、X11、X12、X13、X14及びX15は水素原子を表すことが好ましい。 In General Formula (1), R 10 represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, or a lower alkoxy group having 1 to 6 carbon atoms, and X 10 , X 11 , X 12 , X 13 , X 14 and X 15 preferably represent a hydrogen atom.

以下に一般式(1)で表される有機発光材料の具体例を例示するが、これに限定されるわけではない。   Although the specific example of the organic luminescent material represented by General formula (1) below is illustrated, it is not necessarily limited to this.

(R20
一般式(2)中、R20はアルキル基を表す。
一般式(2)中、R20で表されるアルキル基としては、R10で表されるアルキル基と同様のアルキル基が挙げられる。
(R 20 )
In general formula (2), R 20 represents an alkyl group.
In the general formula (2), examples of the alkyl group represented by R 20 include the same alkyl groups as the alkyl group represented by R 10 .

(X20〜X25
一般式(2)中、X20、X21、X22、X23、X24及びX25は、各々独立に、水素原子又はアルキル基を表す。
(X 20 ~X 25)
In General Formula (2), X 20 , X 21 , X 22 , X 23 , X 24 and X 25 each independently represent a hydrogen atom or an alkyl group.

一般式(2)中、X20〜X25で表されるアルキル基としては、X10〜X15で表されるアルキル基と同様のアルキル基が挙げられる。 In the general formula (2), examples of the alkyl group represented by X 20 to X 25 include the same alkyl groups as the alkyl groups represented by X 10 to X 15 .

一般式(2)において、R20は炭素数1以上5以下の低級アルキル基を表し、X20、X21、X22、X23、X24及びX25は水素原子を表すことが好ましい。 In the general formula (2), R 20 represents a lower alkyl group having 1 to 5 carbon atoms, and X 20 , X 21 , X 22 , X 23 , X 24 and X 25 preferably represent a hydrogen atom.

一般式(2)中、X20及びX21、X22及びX23、X23及びX24、並びにX24及びX25を、互いに連結して形成される環構造としては、ベンゼン環、及び炭素数10以上18以下の縮合環(例えば、ナフタレン環、アントラセン環、フェナントレン環、クリセン環(ベンゾ[α]フェナントレン環)、テトラセン環、テトラフェン環(ベンゾ[α]アントラセン環)、トリフェニレン環等)などが挙げられる。 In the general formula (2), X 20 and X 21 , X 22 and X 23 , X 23 and X 24 , and X 24 and X 25 are connected to each other as a ring structure, and a benzene ring and carbon Condensed ring of several tens to 18 or less (for example, naphthalene ring, anthracene ring, phenanthrene ring, chrysene ring (benzo [α] phenanthrene ring), tetracene ring, tetraphen ring (benzo [α] anthracene ring), triphenylene ring, etc.) Etc.

以下に一般式(2)で表される有機発光材料の具体例を例示するが、これに限定されるわけではない。   Although the specific example of the organic luminescent material represented by General formula (2) below is illustrated, it is not necessarily limited to this.

本実施形態に係る特定有機発光材料の発光の種類は、溶液状態及び固体状態ともに特に限定されず、蛍光、燐光、遅延蛍光のいずれであってもよい。発光の種類は、発光スペクトル及び発光寿命の測定により帰属できる。   The kind of light emission of the specific organic light emitting material according to the present embodiment is not particularly limited in both the solution state and the solid state, and may be any of fluorescence, phosphorescence, and delayed fluorescence. The type of emission can be attributed by measurement of emission spectrum and emission lifetime.

[特定有機発光材料の合成]
以下、特定有機発光材料の合成について説明する。
[Synthesis of specific organic light-emitting materials]
Hereinafter, the synthesis of the specific organic light emitting material will be described.

一般式(1)で表される有機発光材料は、市販品を用いてもよいし、合成してもよい。   As the organic light emitting material represented by the general formula (1), a commercially available product may be used or synthesized.

一般式(1)で表される有機発光材料の市販品としては、例えば、東京化成工業株式会社製のH0935、H0839、H0797、;AlfaAesar社製のA19532;関東化学株式会社製の19500−1A;シグマ−アルドリッチ社製の205664−25G、540188−5G;和光純薬工業株式会社製の323−29623、325−29622、325−53672、329−53675;等が挙げられる。   As a commercial item of the organic luminescent material represented by the general formula (1), for example, H0935, H0839, H0797 manufactured by Tokyo Chemical Industry Co., Ltd .; A19532 manufactured by Alfa Aesar; 19500-1A manufactured by Kanto Chemical Co., Ltd .; Examples include 205664-25G and 540188-5G manufactured by Sigma-Aldrich; 323-29623, 325-29622, 325-53672, and 329-53675 manufactured by Wako Pure Chemical Industries, Ltd .;

一般式(1)で表される有機発光材料の合成方法は、特に限定されず、公知の方法を用いて合成してよい。例えば、特開2004−091361号公報の[0022]〜[0026]、特開2010−083782号公報の[0024]〜[0036]、特開2010−006741号公報の[0031]〜[0039]等に記載の合成方法が挙げられる。   The method for synthesizing the organic light-emitting material represented by the general formula (1) is not particularly limited, and may be synthesized using a known method. For example, [0022] to [0026] of Japanese Patent Application Laid-Open No. 2004-091361, [0024] to [0036] of Japanese Patent Application Laid-Open No. 2010-037882, [0031] to [0039] of Japanese Patent Application Laid-Open No. 2010-006741, and the like. And the synthesis method described in the above.

一般式(2)で表される有機発光材料の合成方法は、特に限定されず、公知の方法を用いて合成してもよい。例えば、下記に示すように、対応する一般式(1)で表される有機発光材料と、三フッ化ホウ素ジエチルエーテル錯体とを反応させ、一般式(2)で表される有機発光材料を合成してもよい。   The method for synthesizing the organic light emitting material represented by the general formula (2) is not particularly limited, and may be synthesized using a known method. For example, as shown below, the organic light-emitting material represented by the general formula (2) is synthesized by reacting the corresponding organic light-emitting material represented by the general formula (1) with a boron trifluoride diethyl ether complex. May be.

一般式(2)で表される有機発光材料の合成反応において、溶剤は必ずしも使用する必要はないが、使用する際の好ましい溶剤としては、ベンゼン、トルエン、キシレン等の溶剤が挙げられる。   In the synthesis reaction of the organic light-emitting material represented by the general formula (2), it is not always necessary to use a solvent, but preferred solvents for use include solvents such as benzene, toluene and xylene.

ここで、例えば、X20〜X25が、それぞれ独立に異なるアルキル基を有する有機発光材料を合成する場合、対応する一般式(1)で表される有機発光材料と、導入したいアルキル基のハロゲン化物(より好ましくはブロモ化物又は塩化物)とを、フリーデルクラフツ反応等により反応させることで、合成してもよい。 Here, for example, when synthesizing organic light-emitting materials in which X 20 to X 25 each independently have a different alkyl group, the corresponding organic light-emitting material represented by the general formula (1) and the halogen of the alkyl group to be introduced A compound (more preferably bromide or chloride) may be synthesized by reacting with a Friedel-Crafts reaction or the like.

反応における触媒としては、特に限定されず、例えば、塩化アルミニウム、塩化亜鉛等の通常のフリーデルクラフツ反応等のアルキル基導入反応に用いるものを使用してよい。   The catalyst in the reaction is not particularly limited, and for example, a catalyst used for an alkyl group introduction reaction such as a normal Friedel-Crafts reaction such as aluminum chloride or zinc chloride may be used.

[有機発光素子]
本実施形態に係る有機発光素子は、既述の特定有機発光材料を含む。具体的には、有機発光素子は、特定有機発光材料を含む発光層を有する素子である。
[Organic light emitting device]
The organic light emitting device according to this embodiment includes the specific organic light emitting material described above. Specifically, the organic light emitting device is a device having a light emitting layer containing a specific organic light emitting material.

本明細書における有機発光素子は、例えば、表示装置、照明装置の構成部材、電子写真方式の画像形成装置の露光光源、液晶表示装置のバックライト、白色光源にカラーフィルターを有する発光装置等の発光素子として好適に用いられる。
表示装置としては、例えば、有機発光素子を表示部に用い、有機発光素子とトランジスタのドレイン電極又はソース電極と接続させて発光輝度を制御することにより、有機ELテレビ、パーソナルコンピュータのディスプレイ等の画像表示装置が挙げられ、本実施形態に係る有機発光素子を適用することができる。
The organic light emitting element in the present specification is, for example, a display device, a component of an illumination device, an exposure light source of an electrophotographic image forming device, a backlight of a liquid crystal display device, a light emitting device having a color filter in a white light source, or the like. It is suitably used as an element.
As a display device, for example, an organic light-emitting element is used for a display unit, and the organic light-emitting element is connected to a drain electrode or a source electrode of a transistor to control light emission luminance. A display apparatus is mentioned, The organic light emitting element which concerns on this embodiment is applicable.

本実施形態に係る蛍光発光材料は、青色蛍光発光の発光効率が良好である。このため、本実施形態に係る有機発光素子は、赤色、及び緑色の蛍光発光材料を含む有機発光素子と組み合わせて、例えば、画像表示装置に適用した場合に、白色の表示性が良好であり、コントラストに優れた画像が得られるため、その応用範囲は広い。   The fluorescent light-emitting material according to this embodiment has good emission efficiency of blue fluorescent light emission. For this reason, the organic light emitting device according to the present embodiment has a good white display property when applied to, for example, an image display device in combination with an organic light emitting device containing red and green fluorescent light emitting materials. Since an image with excellent contrast can be obtained, its application range is wide.

以下、本実施形態に係る特定有機発光材料について、実施例に基づきさらに詳細に説明するが、本発明はこれにより限定されるものではない。なお、特に断りがない限り「部」は「質量部」を意味する。   Hereinafter, although the specific organic luminescent material which concerns on this embodiment is demonstrated in detail based on an Example, this invention is not limited by this. Unless otherwise specified, “part” means “part by mass”.

−特定有機発光材料の準備−
(A)一般式(1)で表される有機発光材料
一般式(1)で表される有機発光材料としては、例示化合物1−1(東京化成社製、H0839)、例示化合物1−2(東京化成社製、H0935)、及び例示化合物1−4(東京化成社製、H0797)を用いた。
-Preparation of specific organic light emitting materials-
(A) Organic Light-Emitting Material Represented by General Formula (1) As the organic light-emitting material represented by General Formula (1), Exemplary Compound 1-1 (Tokyo Chemical Industry Co., Ltd., H0839), Exemplary Compound 1-2 ( Tokyo Chemical Industry Co., Ltd., H0935) and Exemplary Compound 1-4 (Tokyo Chemical Industry Co., Ltd., H0797) were used.

(B)一般式(2)で表される有機発光材料
・例示化合物2−1の合成
例示化合物1−2(428mg,2.3mmol)と、三フッ化ホウ素ジエチルエーテル錯体(46%,1.0ml,0.37mmol)を15mlのベンゼンに溶かし、1時間還流した。沈殿を濾過し、トルエンで再結晶して480mgの例示化合物2−1を収率89%で得た。得られた例示化合物2−1のH−NMRスペクトルを、図1に示す。
(B) Synthesis of Organic Light-Emitting Material Represented by General Formula (2) / Exemplary Compound 2-1 Exemplified Compound 1-2 (428 mg, 2.3 mmol) and boron trifluoride diethyl ether complex (46%, 1. 0 ml, 0.37 mmol) was dissolved in 15 ml of benzene and refluxed for 1 hour. The precipitate was filtered and recrystallized from toluene to obtain 480 mg of Exemplified Compound 2-1 in 89% yield. FIG. 1 shows the 1 H-NMR spectrum of the obtained exemplary compound 2-1.

H−NMR(400MHz,CDCl)δ=8.63(d,1H,J=8.3),8.71(ddd,1H,J=8.1,6.7,1.2),7.76(dd,1H,J=7.1,1.2),7.62(ddd,1H,J=8.4,6.7,1.2),7.49(d,J=9.1),7.31(d,1H,J=9.1),2.87(s,3H)。HRMS(FAB−TOF)m/z calcd.forC12BF:234.0664[MH],found:234.0666。 1 H-NMR (400 MHz, CDCl 3 ) δ H = 8.63 (d, 1H, J = 8.3), 8.71 (ddd, 1H, J = 8.1, 6.7, 1.2) 7.76 (dd, 1H, J = 7.1, 1.2), 7.62 (ddd, 1H, J = 8.4, 6.7, 1.2), 7.49 (d, J = 9.1), 7.31 (d, 1H, J = 9.1), 2.87 (s, 3H). HRMS (FAB-TOF) m / z calcd. forC 12 H 9 BF 2 O 2 : 234.0664 [MH +], found: 234.0666.

[実施例1〜実施例4]
上述で準備した各特定有機発光材料について、以下の様に実施例1〜4とした。
実施例1:例示化合物1−1
実施例2:例示化合物1−2
実施例3:例示化合物1−4
実施例4:例示化合物2−1
[Examples 1 to 4]
About each specific organic luminescent material prepared above, it was set as Examples 1-4 as follows.
Example 1: Exemplary compound 1-1
Example 2: Exemplified compound 1-2
Example 3: Exemplified compound 1-4
Example 4: Exemplary compound 2-1

−特定有機発光材料の固体状態における光学特性の評価−
(紫外可視吸収スペクトルの測定)
紫外可視分光光度計(Ubest−50、日本分光(株)JACSO社製)を用いて紫外可視吸収スペクトルを測定した。各実施例における紫外可視吸収スペクトルを、「ABS」と標記して図2に示す。
温度:室温(25℃)
溶媒:クロロホルム
濃度:1.0×10−5 mmol/L
セル:1cm角セル
-Evaluation of optical properties of specific organic light-emitting materials in the solid state-
(Measurement of UV-visible absorption spectrum)
The ultraviolet-visible absorption spectrum was measured using an ultraviolet-visible spectrophotometer (Ubest-50, manufactured by JASCO Corporation). The ultraviolet-visible absorption spectrum in each example is shown as “ABS” in FIG.
Temperature: Room temperature (25 ° C)
Solvent: Chloroform Concentration: 1.0 × 10 −5 mmol / L
Cell: 1cm square cell

(発光スペクトルの測定)
分光蛍光光度計(F−4010、(株)日立ハイテクノロジーズ社製)を用いて、溶液中の発光スペクトルおよび絶対PL光量子収率測定装置(C9920−02、浜松フォトニクス(株)製)を用いて固体状態の発光スペクトルを測定した。測定条件は以下の通りとした。各実施例の溶液状態における最大発光波長をλPLsolution、固体状態における最大発光波長をλPLsolid、と称し表1に示す。また、各実施例の溶液状態における発光スペクトルを「PL」と標記して図2に、固体状態における発光スペクトルを図3に示す。
温度:室温(25℃)
溶媒:クロロホルム
濃度:1.0×10−5 mmol/L
セル:1cm角セル
(Measurement of emission spectrum)
Using a spectrofluorometer (F-4010, manufactured by Hitachi High-Technologies Corporation), using an emission spectrum in solution and an absolute PL photon yield measuring device (C9920-02, manufactured by Hamamatsu Photonics Co., Ltd.) The solid state emission spectrum was measured. The measurement conditions were as follows. Table 1 shows the maximum emission wavelength in the solution state of each Example as λ PLsolution and the maximum emission wavelength in the solid state as λ PLsolid . Further, the emission spectrum in the solution state of each example is indicated as “PL” in FIG. 2, and the emission spectrum in the solid state is shown in FIG.
Temperature: Room temperature (25 ° C)
Solvent: Chloroform Concentration: 1.0 × 10 −5 mmol / L
Cell: 1cm square cell

(発光量子収率)
絶対PL光量子収率測定装置(C9920−02、浜松フォトニクス(株)製)を用いて、溶液状態及び固体状態における各化合物の発光量子収率を測定した。各実施例の溶液状態における発光量子収率をΦsolution、固体状態における発光量子収率をΦsolid、と称し表1に示す。
なお、発光量子収率とは、物質が吸収した光子のうち、発光として放出される光子の割合を表す。発光量子収率の値が高いほど、発光の効率がよく、かつ、発光の強度が強いことを表す。
温度:室温(25℃)
溶媒:クロロホルム
濃度:1.0×10−5 mmol/L
セル:1cm角セル
(Luminescence quantum yield)
Using an absolute PL photon yield measuring apparatus (C9920-02, manufactured by Hamamatsu Photonics Co., Ltd.), the luminescence quantum yield of each compound in a solution state and a solid state was measured. Table 1 shows the emission quantum yield in the solution state of each example as Φ solution and the emission quantum yield in the solid state as Φ solid .
Note that the luminescence quantum yield represents the proportion of photons emitted as luminescence among the photons absorbed by the substance. The higher the value of the emission quantum yield, the better the emission efficiency and the stronger the emission intensity.
Temperature: Room temperature (25 ° C)
Solvent: Chloroform Concentration: 1.0 × 10 −5 mmol / L
Cell: 1cm square cell

(発光寿命)
小型発光寿命測定装置(C11367−01、浜松フォトニクス(株)製)を用いて、各実施例の特定有機発光材料について、単一光子計測法により、各実施例の溶液状態における発光寿命(τ)を測定した。その結果を表1に示す。
温度:室温(25℃)
溶媒:クロロホルム
濃度:1.0×10−5 mmol/L
セル:1cm角セル
(Luminescent life)
Using a small luminescence lifetime measuring device (C11367-01, manufactured by Hamamatsu Photonics Co., Ltd.), the luminescence lifetime (τ) in the solution state of each example by the single photon measurement method for the specific organic luminescent material of each example. Was measured. The results are shown in Table 1.
Temperature: Room temperature (25 ° C)
Solvent: Chloroform Concentration: 1.0 × 10 −5 mmol / L
Cell: 1cm square cell

表1及び図2〜3に示す結果から、実施例1〜4の特定有機発光材料は、溶液状態及び固体状態の両方において発光を示すことがわかった。   From the results shown in Table 1 and FIGS. 2 to 3, it was found that the specific organic light emitting materials of Examples 1 to 4 emitted light in both the solution state and the solid state.

Claims (4)

一般式(1)又は一般式(2)で表される有機発光材料。

(一般式(1)中、R10は水素原子、アルキル基又はアルコキシ基を表す。X10、X11、X12、X13、X14及びX15は、各々独立に、水素原子又はアルキル基を表す。X10及びX11、X12及びX13、X13及びX14、並びにX14及びX15は、各々独立に、互いに連結して環を形成してもよい。
一般式(2)中、R20はアルキル基を表す。X20、X21、X22、X23、X24及びX25は、各々独立に、水素原子又はアルキル基を表す。X20及びX21、X22及びX23、X23及びX24、並びにX24及びX25は、各々独立に、互いに連結して環を形成してもよい。)
The organic luminescent material represented by General formula (1) or General formula (2).

(In the general formula (1), R 10 represents a hydrogen atom, an alkyl group or an alkoxy group. X 10 , X 11 , X 12 , X 13 , X 14 and X 15 are each independently a hydrogen atom or an alkyl group. X 10 and X 11 , X 12 and X 13 , X 13 and X 14 , and X 14 and X 15 may be independently connected to each other to form a ring.
In General Formula (2), R 20 represents an alkyl group. X 20 , X 21 , X 22 , X 23 , X 24 and X 25 each independently represent a hydrogen atom or an alkyl group. X 20 and X 21 , X 22 and X 23 , X 23 and X 24 , and X 24 and X 25 may be independently connected to each other to form a ring. )
前記一般式(2)において、R20が炭素数1以上5以下の低級アルキル基を表し、
20、X21、X22、X23、X24及びX25は水素原子を表す有機発光材料である請求項1に記載の有機発光材料。
In the general formula (2), R 20 represents a lower alkyl group having 1 to 5 carbon atoms,
The organic light-emitting material according to claim 1, wherein X 20 , X 21 , X 22 , X 23 , X 24 and X 25 are organic light-emitting materials representing hydrogen atoms.
前記一般式(1)において、R10が水素原子、炭素数1以上5以下の低級アルキル基、又は炭素数1以上6以下の低級アルコキシ基を表し、
10、X11、X12、X13、X14及びX15は水素原子を表す有機発光材料である請求項1又は請求項2に記載の有機発光材料。
In the general formula (1), R 10 represents a hydrogen atom, a lower alkyl group having 1 to 5 carbon atoms, or a lower alkoxy group having 1 to 6 carbon atoms,
The organic light-emitting material according to claim 1, wherein X 10 , X 11 , X 12 , X 13 , X 14 and X 15 are organic light-emitting materials representing hydrogen atoms.
請求項1〜請求項3に記載の有機発光材料を含む有機発光素子。   An organic light emitting device comprising the organic light emitting material according to claim 1.
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JP2004526707A (en) * 2001-02-09 2004-09-02 シーメンス アクチエンゲゼルシヤフト Amorphous organic 1,3,2-dioxaborin phosphor, process for its production and use thereof

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JP2004526707A (en) * 2001-02-09 2004-09-02 シーメンス アクチエンゲゼルシヤフト Amorphous organic 1,3,2-dioxaborin phosphor, process for its production and use thereof

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J. A. ORGANERO, ET AL., J. PHYS. CHEM. A, vol. 105, JPN6021042827, 2001, pages 7317 - 7320, ISSN: 0004629685 *

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