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  • C08G2261/50—Physical properties
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  • C09K2211/1433—Carbocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/917—Electroluminescent

Definitions

• This invention relates to semiconductive polymers, their synthesis and use in optical devices.
• Electroactive polymers are now frequently used in a number of optical devices such as in polymeric light emitting diodes (“PLEDs”) as disclosed in WO 90/13148, photovoltaic devices as disclosed in WO 96/16449 and photodetectors as disclosed in US 5523555.
• PLEDs polymeric light emitting diodes
• photovoltaic devices as disclosed in WO 96/16449
• photodetectors as disclosed in US 5523555.
• a typical PLED comprises an organic electroluminescent layer located between an anode and a cathode.
• holes are injected into the device through the anode and electrons are injected into the device through the cathode.
• Holes enter the highest occupied molecular orbital ("HOMO") of the electroluminescent polymer and electrons enter the lowest unoccupied molecular orbital (“LUMO”) and then combine to form an exciton which undergoes radiative decay to give light.
• HOMO highest occupied molecular orbital
• LUMO lowest unoccupied molecular orbital
• the colour of light emitted from the electroluminescent polymer depends on its HOMO-LUMO bandgap.
• An electron transport material is commonly used to assist in transport of electrons from the cathode to the LUMO of the electroluminescent polymer and thus increase device efficiency.
• Suitable electron transport materials are those having a LUMO level falling between the LUMO level of the electroluminescent polymer and the workfunction of the cathode.
• a hole transporting material having a HOMO level falling between the workfunction of the anode and the HOMO level of the emissive material is commonly used.
• WO 99/48160 discloses a blend of a hole transporting polymer, an electron transporting polymer and an electroluminescent polymer.
• the electron transporting functionality and the emissive functionality may be provided by different blocks of a block copolymer as disclosed in WO 00/55927.
• a difficulty encountered with blue electroluminescent polymers is that their lifetime (i.e. the time taken for brightness to halve from a given starting brightness at fixed current) tends to be shorter than that of corresponding red or green materials.
• One of the factors that has been proposed as contributing to the more rapid degradation of blue materials is that their LUMO levels, and consequently the energy level of the charged state following injection of an electron into the LUMO, tends to be less deep than those of corresponding red or green materials. It is therefore possible that materials comprising these lower electron affinities are less electrochemically stable and therefore more prone to degradation.
• a full colour display will preferably have the same cathode material for all three electroluminescent materials. This results in the further problem that the energy gap between the LUMO and the workfunction of the cathode for a typical blue electroluminescent polymer is greater than that for a typical red or green electroluminescent polymer. This may contribute to lower efficiency.
• Chains of fluorene repeat units may be used as electron transporting materials.
• polyfluorenes have the advantages of being soluble in conventional organic solvents and have good film forming properties.
• fluorene monomers are amenable to Yamamoto polymerisation or Suzuki polymerisation which enables a high degree of control over the regioregularity of the resultant polymer.
• polyfluorene based polymer is a blue electroluminescent polymer of formula (a) disclosed in WO 00/55927:
• chains of dioctylfluorene function as the electron transport material; the triphenylamine denoted as TFB functions as the hole transport material and the bis(diphenylamino)benzene derivative denoted as PFB functions as the emissive material.
• WO 94/29883 discloses use of electron withdrawing groups, particularly nitrile groups, as substituents on electroluminescent polymers for the purpose of reducing the barrier to electron injection between a high workfunction electrode and the electroluminescent polymer. This document only teaches use of such substituents on poly(arylene vinylenes).
• This disclosure describes use of fluorinated sidechains as a means of decreasing interchain interactions that have been reported to cause aggregation of polyfluorenes and contains no discussion of using such electron deficient substituents as a means to increase electron affinity.
• This polymer is disclosed as showing no photoluminescence.
• WO 00/22026 discloses a homopolymer having a repeat unit of formula (c):
• copolymers of (c) with dialkylfluorene repeat units and with triarylamine repeat units are also disclosed in this document.
• Asymmetric substitution of the 9-position of fluorene is described for the purpose of avoiding polymer aggregation; this document contains no teaching of 9-substituents used for the purpose of enhanced electron injection of the fluorene backbone.
• WO 99/20675 discloses a 1:1 copolymer of 9,9-di-n- octylfluorene and 9,9-di(4-methoxyphenyl)fluorene
• WO 01/62822 discloses a polyfluorene with triarylamine 9-substituents.
• JP 10095972 discloses a molecule of formula (e):
• a high electron affinity material that is capable of functioning as an electron transport material for a blue electroluminescent material.
• such a material would also be capable of functioning as an electron transport material for a red or green material.
• such material may, as a result of its large HOMO-LUMO bandgap, be used as a blue electroluminescent material.
• the present inventors have determined that improved electron injection, and therefore improved PLED performance, may be accomplished by increasing the electron affinity of known polyfluorenes.
• the invention provides a polymer comprising optionally substituted first repeat units of formula (I):
• Ar is selected from:
• the polymer comprises repeat units of formula (II):
• each Ar is independently selected from:
• Preferred Ar groups according to (a) are independently selected from units of formula (III):
• n is from 1-3 and R 1 -R5 are independently selected from:
• R R 5 is an electron withdrawing group.
• n 1 , i.e. Ar is phenyl.
• Ar groups according to (a) are fused aromatic hydrocarbons such as naphthalene and anthracene.
• the electron withdrawing group is selected from: groups comprising fluorine, cyano, nitro, carboxyl, amides, ketones, phosphinoyl, phosphonates, sulfones and esters. More preferably, the at least one electron withdrawing group is selected from fluorine atoms, fluoroalkyl, fluoroaryl and fluoroheteroaryl.
• Preferred electron withdrawing heteroaryls according to (b) are optionally substituted N- containing heteroaryls, in particular optionally substituted pyridines, most particularly pyridine-4-yl; pyrazines; pyrimidines; pyridazines; triazines, most particularly 1,3,5- triazine-2-yl and oxadiazoles.
• the electron withdrawing heteroaryl may be substituted with electron withdrawing groups as outlined above to further increase its electron withdrawing effect.
• the polymer according to the invention comprises a second repeat unit. More preferably the second repeat unit is selected from triarylamines and heteroaromatics.
• the polymer according to the invention is capable of transporting electrons.
• the polymer preferably has at least one segment capable of hole transport and / or emission. Two or more functions of hole transport, electron transport and emission may be provided by the same segment. In particular, a single segment may function as both an electron transporter and an emitter.
• the invention provides an optical device, preferably an electroluminescent device, comprising a polymer as described above.
• an emissive layer comprising a polymer according to the first aspect of the invention between the first and second electrodes.
• the emissive material within the emissive layer may be the polymer according to the first aspect of the invention or another material, preferably another polymer, blended with the polymer according to the first aspect of the invention.
• the polymer according to the first aspect of the invention is capable of transporting electrons in this device.
• the invention provides a monomer comprising an optionally substituted compound of formula (IV):
• the monomer comprises an optionally substituted compound of formula (V):
• each P is independently selected from a reactive boron derivative group selected from a boronic acid group, a boronic ester group and a borane group and a reactive halide group.
• the invention provides a process for preparing a polymer comprising a step of reacting a first monomer as described above with a second monomer that may be the same or different from the first monomer under conditions so as to polymerise the monomers.
• the process comprises polymerising in a reaction mixture:
• each P is a boron derivative functional group selected from a boronic acid group, a boronic ester group and a borane group, and an aromatic monomer having at least two reactive halide functional groups;
• each P is a reactive halide functional group, and an aromatic monomer having at least two boron derivative functional groups selected from boronic acid groups, boronic ester groups and borane groups; or
• polymers according to the invention function effectively as electron transporting materials for red, green or blue electroluminescent polymers without adversely affecting device properties as has been found for systems having aliphatic electron withdrawing 9-substituents such as perfluoroalkyl.
• the polymers prepared using monomers according to the invention may be homopolymers or copolymers.
• a wide range of co-monomers for polymerisation with the monomers of the invention will be apparent to the skilled person.
• Examples of comonomers include triarylamines as disclosed in, for example, WO 99/54385 and heteroaryl units as disclosed in, for example, WO 00/46321 and WO 00/55927.
• triarylamine repeat units for such copolymers include units of formulae 1-6:
• X and Y may be the same or different and are substituent groups.
• A, B, C and D may be the same or different and are substituent groups. It is preferred that one or more of X, Y, A, B, C and D is independently selected from the group consisting of alkyl, aryl, perfluoroalkyl, thioalkyl, cyano, alkoxy, heteroaryl, alkylaryl and arylalkyl groups.
• One or more of X, Y, A, B, C and D also may be hydrogen.
• one or more of X, Y, A, B, C and D is independently an unsubstituted, isobutyl group, an n-alkyl, an n- alkoxy or a trifluoromethyl group because they are suitable for helping to select the HOMO level and/or for improving solubility of the polymer.
• heteroaryl repeat units for such copolymers include units of formulae 7-21 :
• R 6 and R 7 are the same or different and are each independently a substituent group.
• one or both of R 6 and R 7 may be selected from hydrogen, alkyl, aryl, perfluoroalkyl, thioalkyl, cyano, alkoxy, heteroaryl, alkylaryl, or arylalkyl. These groups are preferred for the same reasons as discussed in relation to X, Y, A, B, C and D above.
• R 6 and R 7 are the same. More preferably, they are the same and are each a phenyl group.
• Electron withdrawing groups / heteroaryls suitable for monomers and repeat units of formula (I) according to the invention will be apparent to the skilled person.
• those substituents / heteroaryls having a positive Hammett sigma constant may be suitable.
• the electron withdrawing groups / heteroaryls should preferably be selected to avoid interference with the polymerization of the monomer, e.g. by steric hindrance.
• Electron withdrawing groups Ar according to (a) or (b) may be provided with solubilising groups.
• Particularly preferred as solubilising groups are optionally substituted, branched or linear C ⁇ o alkyl or alkoxy, more preferably C 4 . 10 alkyl.
• the polymer according to the invention may be a homopolymer or a copolymer. Where it is a copolymer, it may be a 1 :1 copolymer, random or block copolymer.
• a block copolymer according to the invention may comprise at least two regions selected from:
• charge transport and emission may be provided by a range of moieties which will be apparent to the skilled person, as described in, for example, WO 00/55927 or US 6353083.
• Preferred methods for polymerisation of the monomers according to the invention are Suzuki polymerisation as described in, for example, WO 00/53656 and Yamamoto polymerisation as described in, for example, T. Yamamoto, “Electrically Conducting And Thermally Stable ⁇ -Conjugated PoIy(arylene)s Prepared by Organometallic Processes", Progress in Polymer Science 1993, 1 7, 1153-1205.
• Monomers according to the invention may be prepared in accordance with the following scheme:
• the polymer may function as a blue electroluminescent polymer as described in WO 00/55927.
• the polymer may be a block copolymer with hole and electron transporting segments (example 2) or a 1:1 regioregular hole transporting copolymer (example 3). It may also show blue electroluminescence.
• the polymer may be used as an electron transporting polymer for a red, green or blue electroluminescent material (examples 4 and 5).
• Device Example 4 the polymer may be used as an electron transporting polymer for a red, green or blue electroluminescent material (examples 4 and 5).
• a device according to the invention was prepared as follows:

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