CN103450460A - Benzodifuran unit-containing polymer and preparation method thereof, and organic electroluminescent device - Google Patents
Benzodifuran unit-containing polymer and preparation method thereof, and organic electroluminescent device Download PDFInfo
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Abstract
A benzodifuran unit-containing polymer has the following structural formula as shown in the specification, wherein R1 is C1-C20 alkyl, R2 is C1-C20 alkyl, and n is an integer of 10-50. Benzodifuran in the benzodifuran unit-containing polymer has a large-plane and conjugation structure, is in favor of charge transport, and is an excellent electron transport unit; nitrogen atoms are modified by alkyls, so as to improve the solubility property and the film-forming property of the polymer, an energy level of the polymer can be adjusted through introduction of cyanogroups, and triphenylamine is a hole transport unit; a triphenylamine group is introduced into a backbone of the benzodifuran-based polymer, and thus balance of current carriers of an electroluminescent device is achieved, so as to solve the problem of low efficiency of the organic electroluminescent device. The invention also provides a preparation method of the benzodifuran unit-containing polymer and the organic electroluminescent device employing the benzodifuran unit-containing polymer.
Description
[technical field]
The present invention relates to photoelectric field, relate in particular to a kind of polymkeric substance containing benzo two furan units and preparation method thereof and the organic electroluminescence device that uses this containing the polymkeric substance of benzo two furan units.
[background technology]
Since Burroughes and Friend reported first polymer LED (PLEDs), in recent two decades in the past, PLED, aspect ultra-thin, the full-color and large-area flat-plate demonstration of preparation, having caused the research and development interest that people are strong, has obtained huge progress simultaneously.The solubility processibility of PLEDs, make people to carry out fabricate devices by reducing costs printing technology, and such as spray ink Printing and silk screen printing, than the small molecules Organic Light Emitting Diode of vacuum evaporation, it becomes original lower, commercially also more feasible.
In order to realize flat pannel display and the solid-state illumination based on PLEDs, just need high performance red, green, blue luminescence polymer.Wherein the blue light polymkeric substance both can be used as luminescent layer, also can be used as the material of main part of luminous object, by energy, shifted or the mode of carrier capture obtains long wavelength's light.Most representative in existing polymkeric substance blue emitting material is poly-fluorenes, but because 9 easy oxidations of fluorenes form Fluorenone, make material easily form exciplex and the long wave emission when luminous, had a strong impact on the stability of the radiative saturated colour purity of device and glow color.Simultaneously, poly-fluorenes is because lower minimumly occupy molecular orbital(MO) (HOMO) energy level, and causes higher hole to inject obstacle.
[summary of the invention]
Based on this, be necessary the polymkeric substance containing benzo two furan units that provides a kind of energy conversion efficiency higher.
In addition, also be necessary to provide a kind of preparation method of the polymkeric substance containing benzo two furan units.
In addition, also be necessary to provide the organic electroluminescence device used containing the polymkeric substance of benzo two furan units.
A kind of polymkeric substance containing benzo two furan units has following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
A kind of preparation method of the polymkeric substance containing benzo two furan units, comprise the steps:
The compd A and the compd B that provide following structural formula to mean,
Compd A is:
compd B is:
wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl;
In oxygen-free environment, the compd A that is 1: 1～1: 1.2 by mol ratio and compd B are added in the organic solvent that contains catalyzer and carry out the Heck coupling reaction, described catalyzer is organic palladium or is the mixture of organic palladium and organophosphor ligand, obtains the polymer P containing benzo two furan units that following structural formula means:
Wherein, the integer that n is 10～50.
In a preferred embodiment, described organic solvent is selected from least one in toluene, DMF and tetrahydrofuran (THF).
In a preferred embodiment, described organic palladium is bi triphenyl phosphine dichloride palladium, tetra-triphenylphosphine palladium or three dibenzalacetone two palladiums, described organophosphorus ligand is tri-o-tolyl phosphine, tri-butyl phosphine or 2-dicyclohexyl phosphorus-2 ', 6 '-dimethoxy-biphenyl, the mol ratio of described organic palladium and described organophosphorus ligand is 1: 4～1: 8.
In a preferred embodiment, the mol ratio of the organic palladium in described catalyzer and described compd A is 1: 20～1: 100.
In a preferred embodiment, the temperature of reaction of described Heck coupling reaction is 70 ℃～130 ℃, and the reaction times is 24 hours～96 hours.
In a preferred embodiment, the temperature of reaction of described Heck coupling reaction is 90 ℃～120 ℃.
In a preferred embodiment, also comprise the step that the polymer P containing benzo two furan units is carried out to separation and purification, described purification procedures is as follows: to described compd A and compd B, carry out adding the methyl alcohol precipitating and filtering in the solution after the Heck coupling reaction, the solid that filtration is obtained carries out extracting with methyl alcohol and normal hexane successively, by the chloroform extracting of the solid after extracting, collect the polymer P containing benzo two furan units after evaporating solvent after chloroformic solution obtains purifying.
In a preferred embodiment, described extracting adopts apparatus,Soxhlet's to carry out.
A kind of organic electroluminescence device, comprise luminescent layer, and the material of described luminescent layer is the polymer P containing benzo two furan units with following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
In a preferred embodiment, the thickness of described luminescent layer is 20nm～60nm.
Above-mentioned containing in the polymer electroluminescent device of benzo two furan units, benzo two furans have large plane and conjugated structure, are conducive to the electric charge transmission, are good electric transmission unit; Pass through alkyl modified on N, thereby improve solubility property and the film forming properties of multipolymer, can regulate the energy level of multipolymer by introducing cyano group, triphenylamine is the hole transport unit, introduce triphenylamine base on benzo difuryl main polymer chain, realize the carrier balance of electroluminescent device, thereby solve the organic electroluminescence device low efficiency problem.
The preparation method of the above-mentioned polymkeric substance containing benzo two furan units, adopted better simply synthetic route, thereby reduce technical process, and starting material are cheap and easy to get, makes manufacturing cost reduce; And worth polymeric material novel structure, solubility property is good, and film forming properties is good, applicable to organic electroluminescence device.
[accompanying drawing explanation]
The preparation method's of the polymkeric substance containing benzo two furan units that Fig. 1 is an embodiment schema;
The structural representation of the organic electroluminescence device that Fig. 2 is an embodiment;
The fluorescence spectrum figure of the polymkeric substance containing benzo two furan units that Fig. 3 is embodiment 1 preparation;
The thermogravimetic analysis (TGA) figure of the polymkeric substance containing benzo two furan units that Fig. 4 is embodiment 1 preparation.
[embodiment]
Polymkeric substance that contains benzo two furan units below in conjunction with the drawings and specific embodiments and its preparation method and application is further illustrated.
The polymkeric substance containing benzo two furan units of one embodiment has following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
Above-mentioned have large plane and conjugated structure containing benzo two furans in the polymkeric substance of benzo two furan units, is conducive to the electric charge transmission, is good electric transmission unit; On nitrogen-atoms by alkyl modified, thereby improve solubility property and the film forming properties of polymkeric substance, by introducing the energy level that cyano group can telomerized polymer.Triphenylamine is the hole transport unit.Introduce triphenylamine base on benzo difuryl main polymer chain, realize the carrier balance of electroluminescent device, thereby solve the organic electroluminescence device low efficiency problem.
The preparation method of the polymkeric substance containing benzo two furan units of one embodiment as shown in Figure 1, comprises the following steps:
Step S1, provide compd A and compd B.
The structural formula of compd A is:
wherein, R
1for C
1～C
20alkyl.
The structural formula of compd B is:
wherein, R
2for C
1～C
20alkyl.
In present embodiment, compd A can be bought and obtain from the market, but the disclosed method of compd B reference literature (J.Org.Chem.2010.75.3351) is synthesized or bought and obtain from the market.
Step S2, preparation contain the polymer P of benzo two furan units.
In oxygen-free environment, the compd A that is 1: 1～1: 1.2 by mol ratio and compd B are added in the organic solvent that contains catalyzer and carry out the Heck coupling reaction, the mixture that described catalyzer is organic palladium or organic palladium and organophosphor ligand obtains the polymer P containing benzo two furan units that following structural formula means:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
In present embodiment, the Heck coupling reaction carries out under nitrogen atmosphere.
In present embodiment, organic solvent is selected from least one in toluene, DMF and tetrahydrofuran (THF).Be appreciated that organic solution also can be used other solvents, as long as can dissolved compound A and compd B.
In present embodiment, organic palladium is bi triphenyl phosphine dichloride palladium, tetra-triphenylphosphine palladium or three dibenzalacetone two palladiums, and organophosphorus ligand is tri-o-tolyl phosphine, tri-butyl phosphine or 2-dicyclohexyl phosphorus-2 ', 6 '-dimethoxy-biphenyl.In the mixture of organic palladium and organophosphor ligand, the mol ratio of organic palladium and organophosphor ligand is 1: 4～1: 8.Preferably, adopt the mixture of three dibenzalacetone two palladiums and tri-butyl phosphine as catalyzer.Be appreciated that organic palladium, organophosphor ligand all are not limited to cited kind, as long as energy catalytic cpd A and compd B carry out the Heck coupling reaction
In present embodiment, in catalyzer, the mol ratio of organic palladium and compd A is 1: 20～1: 100.The mol ratio that is appreciated that organic palladium and compd A is not limited to 1: 20～and 1: 100, in the organic solvent that adds compd A and compd B, add the catalyzer of catalytic amount to get final product.
In present embodiment, the temperature of reaction of Heck coupling reaction is 70 ℃～130 ℃, and the reaction times is 24 hours～96 hours.Preferably, the temperature of reaction of Heck coupling reaction is 90 ℃～120 ℃, and the reaction times is 24 hours～72 hours.The temperature of reaction that is appreciated that the Heck coupling reaction is not limited to 70 ℃～130 ℃, as long as can make compd A and compd B react; Reaction times also is not limited to 24 hours～and 96 hours, as long as can make compd A and compd B react completely as far as possible.
Step S3, separation and purification contain the polymer P of benzo two furan units.
To described compd A and compd B, carry out adding the methyl alcohol precipitating and filtering in the solution after the Heck coupling reaction, the solid that filtration is obtained carries out extracting with methyl alcohol and normal hexane successively, by the chloroform extracting of the solid after extracting, collect the polymer P containing benzo two furan units after evaporating solvent after chloroformic solution obtains purifying.
In present embodiment, extracting is used apparatus,Soxhlet's to carry out.
In present embodiment, by collecting evaporating solvent after chloroformic solution, obtain the polymer P containing benzo two furan units after purifying 50 ℃ of dryings 24 hours under vacuum.
The preparation method of the above-mentioned polymkeric substance containing benzo two furan units, synthetic route is comparatively simple, has reduced manufacturing cost; The polymkeric substance containing benzo two furan units of preparation is introduced triphenylamine base on benzo difuryl main polymer chain, realizes the carrier balance of electroluminescent device, thereby solves the organic electroluminescence device low efficiency problem.
The organic electroluminescence device containing benzo two furan units of one embodiment, comprise luminescent layer, and the material of described luminescent layer is the polymer P containing benzo two furan units with following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
In present embodiment, the thickness of described luminescent layer is 20nm～60nm.
It is below specific embodiment.
Embodiment 1
The present embodiment disclose structural formula following poly-{ 4,4 '-divinyl-N-(4-octane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-di-n-octyl amino)-3,7-dicyano benzo [1,2-b: 4,5-b '] two furans } (containing the polymer P 1 of benzo two furan units):
The preparation process of the above-mentioned polymer P 1 containing benzo two furan units is as follows:
Under argon shield, by compd A: 4,4 '-divinyl-N-(4-octane oxygen base phenyl) pentanoic (85mg, 0.2mmol), compd B: 2,6-bis-(N, N-di-n-octyl amino)-3,7-dicyano-4,8-diiodo-benzo [1,2-b:4,5-b '] two furans (188mg, 0.2mmol) add in the flask that fills the 10ml toluene solvant and fully dissolve, vacuumize deoxygenation and be filled with argon gas, then add bi triphenyl phosphine dichloride palladium (5.6mg, 0.008mmol); Flask is heated to 100 ℃ and carries out Heck coupling reaction 60h.Subsequently, stop polyreaction after cooling, to dripping in 50ml methyl alcohol and carry out sedimentation in flask; Use successively methyl alcohol and normal hexane extracting 24h after filtering by apparatus,Soxhlet's.Then take chloroform as solvent extraction to colourless, collect chloroformic solution and be spin-dried for and obtain red powder, under vacuum pump, taking out spends the night obtains product poly-{ 4,4 '-divinyl-N-(4-octane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-di-n-octyl amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans }, productive rate 67%.
Above-mentioned preparation is as follows containing the reaction formula of the polymer P 1 of benzo two furan units:
The molecule measuring test result is: Molecular weight (GPC, THF, R.I): Mn=34.1kDa, Mw/Mn=2.3.
Referring to accompanying drawing 3, be the fluorescence spectrum figure of the organic semiconductor material P1 of preparation in embodiment 1, fluorescence spectrum is measured on Jasco FP-6600 type fluorescence spectrophotometer.As seen from the figure: the maximum emission peak of polymkeric substance of the present invention is positioned at the 421nm left and right, shows this polymkeric substance emission blue light.Fluorescence quantum yield Φ
fbe 0.88.
Referring to accompanying drawing 4, be the thermogravimetic analysis (TGA) figure of the organic semiconductor material P1 of the present embodiment 1 preparation, thermogravimetric curve (TGA) test is carried out on TA SDT 2960 instruments, and under the nitrogen gas stream protection, heat-up rate is 10K/min.5% thermal weight loss temperature (T as seen from the figure
d) be 454 ℃.
Embodiment 2
The present embodiment disclose structural formula following poly-{ 4,4 '-divinyl-N-(4-p-methoxy-phenyl) pentanoic-co-2,6-bis-(N, N-bis-NSC 62789 base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans } (containing the polymer P 2 of benzo two furan units):
The preparation process of the above-mentioned polymer P 2 containing benzo two furan units is as follows:
Under nitrogen and the protection of argon gas gas mixture, compd A just: 4, 4 '-divinyl-N-(4-p-methoxy-phenyl) pentanoic (98mg, 0.3mmol), by compd B: 2, 6-bis-(N, N-bis-NSC 62789 base amino)-3, 7-dicyano-4, 8-diiodo-benzo [1, 2-b:4, 5-b '] two furans (484mg, 0.3mmol) and the 15mL tetrahydrofuran (THF) add in the two-mouth bottle of 50mL specification, after passing into the about 20min of gas mixture air-discharging of nitrogen and argon gas after fully dissolving, then by tetra-triphenylphosphine palladium (4mg, 0.003mmol) add wherein, again after the about 10min of gas mixture air-discharging of fully logical nitrogen and argon gas, two-mouth bottle is joined to 70 ℃ and carry out Heck coupling reaction 96h.Subsequently, stop polyreaction after cooling, in two-mouth bottle, add 40mL methyl alcohol precipitating, after filtering by apparatus,Soxhlet's, use successively methyl alcohol and normal hexane extracting 24h.Then take chloroform as solvent extraction to colourless, collect chloroformic solution and be spin-dried for and obtain red solid, obtain product poly-{ 4 after 50 ℃ of dry 24h after collection under vacuum, 4 '-divinyl-N-(4-p-methoxy-phenyl) pentanoic-co-2,6-bis-(N, N-bis-NSC 62789 base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans }.Productive rate is 53%.
Above-mentioned preparation is as follows containing the reaction formula of the polymer P 2 of benzo two furan units:
The molecule measuring test result is: Molecular weight (GPC, THF, R.I): Mn=16.4kDa, Mw/Mn=2.4.
The fluorescence spectrum of the organic semiconductor material P2 of preparation test in the present embodiment 2, fluorescence spectrum is measured on Jasco FP-6600 type fluorescence spectrophotometer.Result shows: the maximum emission peak of polymkeric substance of the present invention is positioned at the 425nm left and right.
The thermogravimetic analysis (TGA) of the organic semiconductor material P2 of the present embodiment 2 preparations, thermogravimetric curve (TGA) test is carried out on TA SDT 2960 instruments, and under the nitrogen gas stream protection, heat-up rate is 10K/min.5% thermal weight loss temperature (Td) is 446 ℃.
Embodiment 3
The present embodiment disclose structural formula following poly-{ 4,4 '-divinyl-N-(4-NSC 62789 oxygen base phenyl) pentanoic-co-2,6-bis-(N, the N-dimethylamino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans } (containing the polymer P 3 of benzo two furan units):
The preparation process of the above-mentioned polymer P 3 containing benzo two furan units is as follows:
Under nitrogen protection, compd A just: 4,4 '-divinyl-N-(4-NSC 62789 oxygen base phenyl) pentanoic (178mg, 0.3mmol), by compd B: 2,6-bis-(N, the positive methylamino of N-bis-)-3,7-dicyano-4,8-diiodo-benzo [1,2-b:4,5-b '] two furans (180mg, 0.33mmol), palladium (3.5mg, 0.015mmol) and three (o-methoxyphenyl) phosphine (21mg, 0.06mmol) joins the N that fills 12mL, in the flask of dinethylformamide, fully dissolve, subsequently toward after leading to the about 30min of nitrogen purge gas in flask; Flask is heated to 130 ℃ and carries out Heck coupling reaction 24h.Subsequently, stop polyreaction after cooling, in flask, add 40mL methyl alcohol precipitating, after filtering by apparatus,Soxhlet's, use successively methyl alcohol and normal hexane extracting 24h; Then take chloroform as solvent extraction to colourless, collect chloroformic solution and be spin-dried for and obtain red powder, after collection under vacuum after 50 ℃ of dry 24h, obtain product poly-4,4 '-divinyl-N-(4-NSC 62789 oxygen base phenyl) pentanoic-co-2,6-bis-(N, the N-dimethylamino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans }, productive rate is 84%.
Above-mentioned preparation is as follows containing the reaction formula of the polymer P 3 of benzo two furan units:
The molecule measuring test result is: Molecular weight (GPC, THF, R.I): M
n=44.7kDa, M
w/ M
n=2.0.
The fluorescence spectrum of the organic semiconductor material P3 of preparation test in the present embodiment 3, fluorescence spectrum is measured on Jasco FP-6600 type fluorescence spectrophotometer.Result shows: the maximum emission peak of polymkeric substance of the present invention is positioned at the 420nm left and right.
The thermogravimetic analysis (TGA) of the organic semiconductor material P3 of the present embodiment 3 preparations, thermogravimetric curve (TGA) test is carried out on TA SDT 2960instruments, and under the nitrogen gas stream protection, heat-up rate is 10K/min.5% thermal weight loss temperature (T
d) be 445 ℃.
Embodiment 4
The present embodiment disclose structural formula following poly-{ 4,4 '-divinyl-N-(2-bis-normal butane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-bis-n-decane base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans } (containing the polymer P 4 of benzo two furan units):
The preparation process of the above-mentioned polymer P 4 containing benzo two furan units is as follows:
Under nitrogen protection, by compd A: 4, 4 '-divinyl-N-(2-bis-normal butane oxygen base phenyl) pentanoic (111mg, 0.3mmol), compd B: 2, 6-bis-(N, N-bis-n-decane base amino)-3, 7-dicyano-4, 8-diiodo-benzo [1, 2-b:4, 5-b '] two furans (378mg, 0.36mmol), three or two argon benzyl acetone two palladium (9mg, 0.009mmol) and 2-dicyclohexyl phosphine-2 ', 6 '-dimethoxy-biphenyl (29mg, 0.072mmol) join the N that fills 12mL, in the flask of dinethylformamide, fully dissolve, subsequently after the logical about 30min of nitrogen purge gas in flask, flask is heated to 120 ℃ and carries out Heck coupling reaction 36h.Subsequently, stop polyreaction after cooling, in flask, add 40mL methyl alcohol precipitating, after filtering by apparatus,Soxhlet's, use successively methyl alcohol and normal hexane extracting 24h; Then take chloroform as solvent extraction to colourless, collect chloroformic solution and be spin-dried for and obtain red powder, after collection under vacuum after 50 ℃ of dry 24h, obtain product poly-4,4 '-divinyl-N-(2-bis-normal butane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-bis-n-decane base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans }, productive rate is 63%.
Above-mentioned preparation is as follows containing the reaction formula of the polymer P 4 of benzo two furan units:
The molecule measuring test result is: Molecular weight (GPC, THF, R.I): M
n=23.3kDa, M
w/ M
n=2.3.
The fluorescence spectrum of the organic semiconductor material P4 of preparation test in the present embodiment 4, fluorescence spectrum is measured on Jasco FP-6600 type fluorescence spectrophotometer.Result shows: the maximum emission peak of polymkeric substance of the present invention is positioned at the 428nm left and right.
The thermogravimetic analysis (TGA) of the organic semiconductor material P4 of the present embodiment 4 preparations, thermogravimetric curve (TGA) test is carried out on TA SDT 2960instruments, and under the nitrogen gas stream protection, heat-up rate is 10K/min.5% thermal weight loss temperature (T
d) be 456 ℃.
Embodiment 5
The present embodiment disclose structural formula following poly-{ 4,4 '-divinyl-N-(2-bis-n-dodecane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-bis-normal hexane base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans } (containing the polymer P 5 of benzo two furan units):
The preparation process of the above-mentioned polymer P 5 containing benzo two furan units is as follows:
Under nitrogen and the protection of argon gas gas mixture, by compd A: 4, 4 '-divinyl-N-(2-bis-n-dodecane oxygen base phenyl) pentanoic (145mg, 0.3mmol), compd B: 2, 6-bis-(N, N-bis-normal hexane base amino)-3, 7-dicyano-4, 8-diiodo-benzo [1, 2-b:4, 5-b '] two furans (248mg, 0.3mmol) and 15mL toluene add in the two-mouth bottle of 50mL specification, after passing into the about 20min of gas mixture air-discharging of nitrogen and argon gas after fully dissolving, then by tetra-triphenylphosphine palladium (8mg, 0.006mmol) add wherein, again after the about 10min of gas mixture air-discharging of fully logical nitrogen and argon gas, two-mouth bottle is joined to 90 ℃ and carry out Heck coupling reaction 48h.Subsequently, stop polyreaction after cooling, in two-mouth bottle, add 40mL methyl alcohol precipitating, after filtering by apparatus,Soxhlet's, use successively methyl alcohol and normal hexane extracting 24h.Then take chloroform as solvent extraction to colourless, collect chloroformic solution and be spin-dried for and obtain red solid, obtain product poly-{ 4 after 50 ℃ of dry 24h after collection under vacuum, 4 '-divinyl-N-(2-bis-n-dodecane oxygen base phenyl) pentanoic-co-2,6-bis-(N, N-bis-normal hexane base amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans }.Productive rate is 72%.
Above-mentioned preparation is as follows containing the reaction formula of the polymer P 5 of benzo two furan units:
The molecule measuring test result is Molecular weight (GPC, THF, R.I): M
n=41.6kDa, M
w/ M
n=2.1.
The fluorescence spectrum of the organic semiconductor material P5 of preparation test in the present embodiment 5, fluorescence spectrum is measured on Jasco FP-6600 type fluorescence spectrophotometer.Result shows: the maximum emission peak of polymkeric substance of the present invention is positioned at the 422nm left and right.
The thermogravimetic analysis (TGA) of the organic semiconductor material P5 of the present embodiment 5 preparations, thermogravimetric curve (TGA) test is carried out on TA SDT 2960 instruments, and under the nitrogen gas stream protection, heat-up rate is 10K/min.5% thermal weight loss temperature (T
d) be 459 ℃.
Embodiment 6
Refer to Fig. 2, a kind of organic electroluminescence device 50 comprises substrate 51, anode 52, luminescent layer 53, buffer layer 54 and negative electrode 55.Anode 52, luminescent layer 53, buffer layer 54 and negative electrode 55 are formed on substrate 51 successively, and the structure of device is: glass/ITO (150nm)/luminescent layer (30nm)/LiF (1.5nm)/Al (150nm).
In the present embodiment, substrate 51 is glass.
Be appreciated that buffer layer 54 can omit, now luminescent layer 53 directly is formed at negative electrode 55 surfaces.
The manufacturing processed of this organic electroluminescence device 50 is as follows:
The tin indium oxide (ITO) that is 10-20 Ω/mouth at surface sputtering one deck square resistance of glass substrate 51, form the conductive layer as anode 52, base vacuum degree 2 * 10
-5pa, thickness 100～150nm.
Prepare one deck on anode 52 surfaces by spin coating technique with of the present invention poly-{ 4,4 '-divinyl-N-(2-bis-n-octyloxy phenyl) pentanoic-co-2,6-bis-(N, N-di-n-octyl amino)-3,7-dicyano benzo [1,2-b:4,5-b '] two furans } luminescent layer 53, heat 15-60min under 100-200 ℃, rotating speed is 2000～6000rpm, and gauge control is at 20～80nm.
Vacuum evaporation LiF on luminescent layer 53, as buffer layer 54, vacuum tightness is 3 * 10
-5pa, evaporation speed is
thickness 1～2nm;
Vacuum evaporation metallic aluminium on buffer layer 54, thickness 100～200nm, form the metal aluminium lamination as negative electrode 55, obtains described organic electroluminescence device.
In the present embodiment, the electric current-brightness-voltage characteristic of device is that all measurements that completed by the Keithley source measuring system with the correction silicon photoelectric diode (Keithley 2400 Sourcemeter, Keithley 2000 Cuirrentmeter) all complete in atmosphere at room temperature.The maximum luminous efficiency of device is 12.4cd/A, and high-high brightness is 17798cd/m
2.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the polymkeric substance containing benzo two furan units is characterized in that having following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
2. the preparation method containing the polymkeric substance of benzo two furan units, is characterized in that, comprises the steps:
The compd A and the compd B that provide following structural formula to mean,
Compd A is:
compd B is:
wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl;
In oxygen-free environment, the compd A that is 1: 1～1: 1.2 by mol ratio and compd B are added in the organic solvent that contains catalyzer and carry out the Heck coupling reaction, described catalyzer is organic palladium or is the mixture of organic palladium and organophosphor ligand, obtains the polymer P containing benzo two furan units that following structural formula means:
Wherein, the integer that n is 10～50.
3. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, is characterized in that, described organic solvent is selected from least one in toluene, DMF and tetrahydrofuran (THF).
4. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, it is characterized in that, described organic palladium is bi triphenyl phosphine dichloride palladium, tetra-triphenylphosphine palladium or three dibenzalacetone two palladiums, described organophosphorus ligand is tri-o-tolyl phosphine, tri-butyl phosphine or 2-dicyclohexyl phosphorus-2 ', 6 '-dimethoxy-biphenyl, the mol ratio of described organic palladium and described organophosphorus ligand is 1: 4～1: 8.
5. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, is characterized in that, the organic palladium in described catalyzer and the mol ratio of described compd A are 1: 20～1: 100.
6. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, is characterized in that, the temperature of reaction of described Heck coupling reaction is 70 ℃～130 ℃, and the reaction times is 24 hours～96 hours.
7. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, is characterized in that, the temperature of reaction of described Heck coupling reaction is 90 ℃～120 ℃.
8. the preparation method of the polymkeric substance containing benzo two furan units according to claim 2, it is characterized in that, also comprise the step that the polymer P containing benzo two furan units is carried out to separation and purification, described purification procedures is as follows: to described compd A and compd B, carry out adding the methyl alcohol precipitating and filtering in the solution after the Heck coupling reaction, the solid that filtration is obtained carries out extracting with methyl alcohol and normal hexane successively, by the chloroform extracting of the solid after extracting, collect the polymer P containing benzo two furan units after evaporating solvent after chloroformic solution obtains purifying.
9. an organic electroluminescence device, comprise luminescent layer, it is characterized in that, the material of described luminescent layer is the polymer P containing benzo two furan units with following structural formula:
Wherein, R
1for C
1～C
20alkyl, R
2for C
1～C
20alkyl, the integer that n is 10～50.
10. organic electroluminescence device according to claim 9, is characterized in that, the thickness of described luminescent layer is 20nm～60nm.
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