US20140326979A1 - Spirobifluorene compounds for light emitting devices - Google Patents

Spirobifluorene compounds for light emitting devices Download PDF

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US20140326979A1
US20140326979A1 US14/347,665 US201214347665A US2014326979A1 US 20140326979 A1 US20140326979 A1 US 20140326979A1 US 201214347665 A US201214347665 A US 201214347665A US 2014326979 A1 US2014326979 A1 US 2014326979A1
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compound according
light emitting
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sbf
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Dominique Bascour
Jonathan Maunoury
Enrico Orselli
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Sumitomo Chemical Co Ltd
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Solvay SA
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D265/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms
    • C07D265/28—1,4-Oxazines; Hydrogenated 1,4-oxazines
    • C07D265/34—1,4-Oxazines; Hydrogenated 1,4-oxazines condensed with carbocyclic rings
    • C07D265/38—[b, e]-condensed with two six-membered rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D219/00—Heterocyclic compounds containing acridine or hydrogenated acridine ring systems
    • C07D219/02—Heterocyclic compounds containing acridine or hydrogenated acridine ring systems with only hydrogen, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
    • H01L51/0067—
    • H01L51/0071—
    • 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
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/624—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene containing six or more rings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/649—Aromatic compounds comprising a hetero atom
    • H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1018—Heterocyclic compounds
    • C09K2211/1025—Heterocyclic compounds characterised by ligands
    • C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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    • C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
    • C09K2211/10—Non-macromolecular compounds
    • C09K2211/1018—Heterocyclic compounds
    • C09K2211/1025—Heterocyclic compounds characterised by ligands
    • C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
    • C09K2211/1033—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom with oxygen

Definitions

  • the present invention relates to compounds based on spirobifluorene and light emitting devices comprising said compounds.
  • OLEDs organic light emitting diodes
  • Thermal stress during device operation can lead to such phase transitions from the amorphous state to the thermodynamically stable polycrystalline state leading to dramatic degradation of the device.
  • Tg>150° C. high glass transition temperature
  • several host materials have been reported.
  • designing materials having a spiro linkage has been a very successful strategy to obtain OLEDs materials with enhanced morphological stability while keeping their electro-optical functionality.
  • US2006/0141287 discloses light-emitting layers which include a solid organic material containing a mixture of at least two components.
  • the first host component is an organic compound capable of transporting electrical charges and also forms an aggregate.
  • the second component of the mixture is an organic compound capable of transporting electrical charges and, upon mixing with the first host component, is capable of forming a continuous and substantially pin-hole-free layer.
  • various compounds such as substituted fluorene derivatives, and spirobifluorene derivatives, etc. are used as the second component.
  • Spirobifluorene denotes a structural element of formula (S1) and is referred to as SBF hereinafter, whereas Open SBF denotes a system of formula (S2) below.
  • Substituted spirobifluorene compounds have been extensively described in the prior art, in particular with a substitution of the SBF ring system in “para-position (i.e. the 2, 7, 2′ or 7′ position of the SBF) by a heteroatom.
  • Spirobifluorene compounds with diphenylamino substituents in para-position of the SBF unit are again disclosed in Salbeck et al., see e.g. compounds 42 to 48 thereof.
  • WO 2011/06574 discloses 4 and 4,4′diphenylamino-substituted SBF compounds (which may be referred to as ortho-substituted compounds relative to the direct bond linking the phenyl rings of the SBF unit).
  • European Patent Application 2 312 667 discloses compositions for organic electroluminescence elements comprising at least two different materials fulfilling a certain mathematical equation related to the solubility of the materials.
  • suitable materials having as a common structural feature substituted diphenylamino groups, 3,6-Bis-N,N′-di(4-tert.butylphenyl)amino-spirobifluorene as well as the respective Open SBF derivative are mentioned.
  • U.S. Pat. No. 6,893,743 discloses in table 1 compounds compounds H-151 and H-152 in which a central SBF unit carries two substituents in 2 and 7 position, wherein the substituent is bound to the SBF through a nitrogen atom not forming part of an aromatic ring.
  • n, m and o may be the same or different and represent an integer of from 0 to 3,
  • each of the phenyl rings may carry no ligands other than L 1 or may be substituted by ligands other than L 1 ,
  • L 1 which may be the same or different in each position, has the formula A
  • Y is selected from the group consisting of O, S, C ⁇ O, —CR 1 R 2 , N—R 3 , S ⁇ O, S( ⁇ O) 2 , PR 4 and P( ⁇ O)R 5
  • R 1 to R 5 may be the same or different in each position and represent hydrogen or an aliphatic, carbocyclic, aromatic or heterocyclic group with 1 to 20 carbon atoms
  • Ar 1 and Ar 2 represent optionally substituted aromatic or heteroaromatic ring systems comprising 4 to 20 ring atoms (the two ring atoms of the heterocyclic ring shown in formula I being part of the aromatic or heteroaromatic ring system for the purpose of counting ring atoms).
  • aliphatic is intended to denote any group which is attached via a carbon atom or a heteroatom which carbon atom or heteroatom is not part of a ring whereas the term aromatic is intended to denote aryl groups as well as heteroaryl groups attached through a carbon atom or a heteroatom forming part of an aryl or heteroaryl ring.
  • R 1 and R 2 which may be the same or different, represent hydrogen, an alkyl group, a carbocyclic group, an aryl group or a heteroaryl group, which groups are substituted or unsubstituted.
  • the compounds in accordance with the present invention share the common feature that the SBF or Open SBF unit is substituted by a nitrogen atom, which is part of a ring system comprising two aromatic or heteroaromatic rings.
  • substitution in the SBF system may be para, meta or ortho to the bond linking the phenyl rings in the SBF unit or in the analogous positions of the Open SBF unit.
  • a first preferred group of compounds are those where L 1 has the formula A1
  • Y is preferably selected from the group consisting of O, S, C ⁇ O, CR 1 R 2 , N—R 3 and S ⁇ O, particularly preferred from O, S and N—R 3 , even more preferably from O or S, most preferably Y is O, wherein R1 to R 3 have the meaning as defined above.
  • R 1 to R 5 represents an alkyl group, same has preferably 1 to 20, especially 1 to 8 carbon atoms and may be straight chain or branched.
  • Particularly preferred alkyl groups are C 1 to C 4 alkyl like methyl, ethyl, i- or n-propyl and i-, n- and t-butyl.
  • the alkyl groups may themselves be substituted or unsubstituted.
  • Preferred carbocyclic groups for R 1 to R 5 are 5 to 7 membered carbocyclic ring systems, which may be saturated or unsaturated like e.g. cyclopentane, cyclohexane or cyclohexene, to give only three examples.
  • the carbocyclic groups may be substituted or unsubstituted.
  • Preferred aryl groups for R 1 to R 5 are are phenyl, naphthyl, anthracenyl, biphenyl or terphenyl, which may be unsubstituted or substituted by substituents selected from the group consisting of halogen, alkyl, alkoxy, amino, cyano, alkenyl, alkynyl, arylalkyl, aryl and heteroaryl groups or the aryl group may be part of an annealed ring system.
  • aryl substituents are derived from the following substituted or unsubstituted aryl systems
  • a particularly preferred group of heteroaryl groups for R 1 to R 5 are the following:
  • nitrogen atoms may be replaced by another heteroatom like O or S, to name only two examples as shown below:
  • Still another preferred group of heteroaryl substituents comprises the 6-membered ring systems shown below:
  • heteroaryl groups may be substituted, preferably by substituents selected from the group consisting of halogen, alkyl, alkoxy, amino, cyano, alkenyl, alkynyl, arylalkyl, aryl and heteroaryl groups or the heteroaryl group may be part of an annealed ring system.
  • Ar 1 and Ar 2 which may be the same or different can be selected from the aromatic or heteroaromatic ring systems described above for substituents R 1 to R 5 and thus reference thereto is made at this point.
  • Ar 1 and or Ar 2 which may be the same or different, are aryl ring systems as defined above, preferably phenyl or naphthyl, which may be substituted or unsubstituted.
  • a further group of preferred compounds in accordance with the present invention are those wherein at least one of n, m or o represents an integer of from 1 to 3.
  • n, m and o are all zero.
  • L 1 can have any of the meanings defined above.
  • the SBF or open SBF ring system may or may not comprise further substituents in addition to substituents L 1 . If present, such additional substituents, which may be the same or different in each position they occur, are generally selected from of halogen, alkyl, alkoxy, amino, cyano, alkenyl, alkynyl, arylalkyl, aryl and heteroaryl groups.
  • the compounds in accordance with the present invention may be synthesized by any known and suitable method.
  • the skilled person is aware of suitable manufacturing processes.
  • the compounds of the present invention with meta-substituents may be prepared by the following general reaction schemes, which show an exemplary way for compounds carrying one or two ligands L 1
  • X is a leaving group selected from known leaving groups for such reactions such as halogen, OH, OR, SR, OCN, SCN or CN, especially preferably halogen, in particular chlorine or bromine.
  • the starting materials for such synthesis with at least one leaving group in a meta-position of the SBF or Open SBF ring system may be synthesized in accordance with various process routes which the skilled person will select in accordance with the specific needs.
  • such compounds are not easily accessible through introduction of the substituents directly into a SBF or Open SBF core as these routes generally yield the para-substituted products preferably due to their higher reactivity.
  • the substituents X have to be introduced through suitable precursor substances e.g. fluorene derivatives, benzophenone derivatives or biphenyl derivatives, to mention only three examples, which are thereafter reacted to yield the SBF or Open SBF structure.
  • Another embodiment of the present invention is directed to the use of the compounds of the present invention in an organic light emitting device, especially an organic light emitting diode (OLED).
  • OLED organic light emitting diode
  • the compounds in accordance with the present invention may advantageously be used, together with an emitting material, in the emissive layer of an organic light emitting device.
  • the compounds are also suitable for other layers of organic electronic devices, in particular for other layers of organic electronic diodes.
  • the present invention is also directed to an organic light emitting device (OLED) comprising an emissive layer (EML), said emissive layer comprising the compounds of the present invention as host material, said host material being notably suitable in an emissive layer (EML) in an OLED.
  • OLED organic light emitting device
  • EML emissive layer
  • EML emissive layer
  • An OLED generally comprises:
  • a substrate for example (but not limited to) glass, plastic, metal;
  • an anode generally transparent anode, such as an indium-tin oxide (ITO) anode;
  • ITO indium-tin oxide
  • HIL hole injection layer
  • PEDOT/PSS PEDOT/PSS
  • HTL hole transporting layer
  • EML emissive layer
  • ETL electron transporting layer
  • EIL electron injection layer
  • a cathode generally a metallic cathode, such as an Al layer.
  • HBL hole blocking layer
  • EBL electron blocking layer
  • the emissive layer may be equal to the hole transporting layer (in which case the exciton blocking layer is near or at the anode) or to the electron transporting layer (in which case the exciton blocking layer is near or at the cathode).
  • the compounds of the present invention may be used preferably used as hosts in an emissive layer.
  • the emissive layer may also contain a polarization molecule, present as a dopant in said host material and having a dipole moment that generally affects the wavelength of light emitted.
  • a polarization molecule present as a dopant in said host material and having a dipole moment that generally affects the wavelength of light emitted.
  • a layer formed of an electron transporting material is advantageously used to transport electrons into the emissive layer comprising the light emitting material and the (optional) host material.
  • the electron transporting material may be an electron-transporting matrix selected from the group of metal quinoxolates (e.g. Alq3, Liq), oxadiazoles, triazoles and ketones (e.g. Spirobifluorene ketones SBFK).
  • metal quinoxolates e.g. Alq3, Liq
  • oxadiazoles oxadiazoles
  • ketones e.g. Spirobifluorene ketones SBFK
  • Examples of electron transporting materials are tris-(8-hydroxyquinoline)aluminum of formula [“Alq3”] and spirobifluoreneketone SBFK:
  • a layer formed of a hole transporting material is advantageously used to transport holes into the emissive layer comprising the light emitting material as above described and the (optional) host material.
  • a hole transporting material is 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl [“ ⁇ -NPD”].
  • an exciton blocking layer (“barrier layer”) to confine excitons within the luminescent layer (“luminescent zone”) is greatly preferred.
  • the blocking layer may be placed between the emissive layer and the electron transport layer.
  • An example of a material for such a barrier layer is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (also called bathocuproine or “BCP”), which has the formula
  • the OLED has preferably a multilayer structure, as depicted in FIG. 1 , wherein 1 is a glass substrate, 2 is an ITO layer, 3 is a HIL layer comprising PEDOT/PSS, 4 is a HTL layer comprising ⁇ -NPD, 5 is an EML comprising mCBP as host material and the light emitting material or mixture of these materials as above defined as dopant in an amount of about 15% wt with respect to the total weight of host plus dopant; 6 is a HBL comprising BCP; 7 is an ETL comprising Alq 3 ; 8 is an EIL comprising LiF and 9 is an Al layer cathode.
  • 1 is a glass substrate
  • 2 is an ITO layer
  • 3 is a HIL layer comprising PEDOT/PSS
  • 4 is a HTL layer comprising ⁇ -NPD
  • 5 is an EML comprising mCBP as host material and the light emitting material or mixture of these materials as above defined as dopant in an amount of about 15%
  • This compound was made in two steps from 3-bromofluorenone obtained in step 1.
  • 2-bromobiphenyl (1.05 equivalents, 4.0 g, 16.5 mmol) is solubilised in 102 ml of anhydrous diethyl ether.
  • This solution is cooled to ⁇ 60° C. and n-BuLi (1.16 eq.) is added dropwise. After 10 min at this temperature, a white precipitate appeared which was redissolved while the medium was warmed to room temperature.
  • 3-Bromofluorenone was then added and the reaction mixture was kept at 45° C. for one night.
  • reaction medium was partitioned between water and ethyl acetate. The combined organic layers were washed with brine, dried over MgS04, and concentrated. The residue was purified by column chromatography (CH 2 Cl 2 /hexane) to afford the desired product with 76.6% yield.
  • 2-(phenylamino)benzoic acid 50 g, 0.23 mol was dissolved in methanol (1 L), put in an ice bath and stirred for ten minutes. After slowly adding SOCl 2 (60 mL, 0.58 mol) thereto at 0° C., the mixture was stirred under reflux for 12 hours at 90° C. Upon completion of the reaction, the reaction mixture was washed with distilled water and extracted with ethyl acetate. After drying the organic layer with magnesium sulfate and removing the solvent by a rotary type evaporator, 2-(phenylamino)methyl benzoate (47 g, 92%) was obtained through purification by column chromatography using ethyl acetate as developing solvent.
  • Catalyst Pd(dba) 2 (5% mol, 490 mg) and the phosphine P(tBu) 3 (4% mol, 0.675 mL of 1M P(tBu) 3 in toluene) were introduced at room temperature in toluene (10 mL, anhydrous and well degassed) in a two way flask.
  • the HOMO level was determined to ⁇ 5.29 eV, the LUMO level to ⁇ 1.49 eV and the triplet energy to 2.88 eV.
  • the E LUMO (CV) have been calculated from the 1st reduction potential.
  • the triplet energy has been calculated from the highest energy phosphorescence peak in 2-MetTHF at 77 K.
  • All device examples were fabricated by high vacuum thermal evaporation, except for the hole injecting layer which was deposited by spin-coating technique.
  • the anode electrode is 120 nm of indium tin oxide (ITO).
  • ITO indium tin oxide
  • All devices were encapsulated with a glass lid sealed with an epoxy resin in a nitrogen glovebox ( ⁇ 1 ppm of H 2 O and O 2 ) immediately after fabrication, and a moisture getter was incorporated inside the package.
  • the devices were characterized optically and electrically with a C9920-12 External Quantum Efficiency Measurement System from HAMAMATSU.
  • EQE refers to external quantum efficiency expressed in %, while operational stability tests were done by driving the devices at continuous current at room temperature.
  • LT 50 is a measure of lifetime and corresponds to the time for light output to decrease by 50% of the initial value, when the device is driven at a constant current.
  • the OLED stack consisted of sequentially, from the ITO surface, 30 nm of Plexcore OC (a self-doping polymer poly(thiophene-3-[2[(2-methoxyethoxy)ethoxy]-2,5-diyl), supplied from Plextronics Inc.) deposited by spin-coating and dried on a hot plate at 200° C. for 20 min. On top of the HIL, 15 nm of NPB were deposited by by vacuum-thermal evaporation as hole transporting layer (HTL).
  • Plexcore OC a self-doping polymer poly(thiophene-3-[2[(2-methoxyethoxy)ethoxy]-2,5-diyl)
  • ⁇ -NPD As used herein, ⁇ -NPD, Compound A, Compound B, Compound C and Alq3 have the following structures
  • the device structure is summarized in FIG. 2 while Table 1 shows the results measured for the fabricated devices.
  • Compound B was used as host and compound C was used as dopant.

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  • Chemical & Material Sciences (AREA)
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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Other In-Based Heterocyclic Compounds (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US14/347,665 2011-09-28 2012-09-24 Spirobifluorene compounds for light emitting devices Abandoned US20140326979A1 (en)

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EP11007868A EP2574608A1 (en) 2011-09-28 2011-09-28 Spirobifluorene compounds for light emitting devices
EP11007868.0 2011-09-28
EP12005988.6 2012-08-22
EP12005988 2012-08-22
PCT/EP2012/068807 WO2013045410A1 (en) 2011-09-28 2012-09-24 Spirobifluorene compounds for light emitting devices

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US20140231716A1 (en) * 2011-09-28 2014-08-21 Solvay Sa Spirobifluorene compounds for light emitting devices
US11407718B2 (en) 2017-06-21 2022-08-09 Lg Chem, Ltd. Heterocyclic compound and organic light emitting device comprising the same

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