Synthesis and characterization of highly stable blue‐light‐emitting hyperbranched conjugated polymers

Wang, Rui; Wang, Weizhi; Yang, Gui-Zhong; Liu, Tianxi; Yu, Junsheng; Jiang, Yadong

doi:10.1002/pola.22424

Cited by 51 publications

(31 citation statements)

References 30 publications

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“…[1][2][3][4][5] Firstly, they are easy to be synthesized by one-pot polymerization with comparable properties to dendritic polymers or other well dened polymers. 4,8,9 Recently, a number of hyperbranched electroluminescent polymers with the three principle colors (red, 10 green 11,12 and blue 13 ) have been synthesized, and both emission efficiency and thermal stability were effectively improved with respect to their linear analogies. 4,8,9 Recently, a number of hyperbranched electroluminescent polymers with the three principle colors (red, 10 green 11,12 and blue 13 ) have been synthesized, and both emission efficiency and thermal stability were effectively improved with respect to their linear analogies.…”

Section: Introductionmentioning

confidence: 99%

“…23 Polyuorenes (PFs) are shown to be the most promising blue light-emitting materials because of high photoluminescence quantum efficiency, and relatively good chemical and thermal stabilities. 13,28 For this reason, to reduce the band gap between the work function of PEDOT:PSS and the HOMO energy levels of the copolymers, and further improve the electroluminescent (EL) performance of the copolymers, carbazole incorporated into the copolymer backbone is a promising strategy. 27 Carbazole is a well-known hole-transporting unit as a result of the electron-donating capabilities associated with its nitrogen atom.…”

Section: Introductionmentioning

confidence: 99%

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Hyperbranched fluorene-alt-carbazole copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the core and their application in white polymer light-emitting devices

Liang

et al. 2015

RSC Adv.

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A series of hyperbranched copolymers with fluorene-alt-carbazole as the branches and three-dimensionalstructured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core were synthesized by one-pot Suzuki polycondensation. 4,7-Dithienyl-2,1,3-benzothiadiazole (DBT) as the orange-light emitting unit was introduced into the backbones to obtain white-light emission. The thermal, photoluminescent (PL), electrochemical and electroluminescent (EL) properties of the copolymers were investigated. The copolymers show great thermal stabilities by the introduction of a carbazole moiety. Besides, the HOMO energy levels of the copolymers were enhanced and the hole injection was improved because of the hole-transporting ability of the carbazole unit. The hyperbranched structures suppress the interchain interactions efficiently, and help to form amorphous films. The copolymers exhibit efficient EL performance as a result of the hyperbranched structure with the incorporation of the carbazole moiety.A quite low turn-on voltage of 5.3 V, a maximal luminance of 7409.5 cd m À2 and a luminous efficiency of 4.27 cd A À1 were achieved with a CIE coordinate of (0.32, 0.26) for the PFCzSDF10DBT10 (10 mol% of SDF and 0.1 mol% of DBT) device. The hyperbranched framework based on fluorene-alt-carbazole branches and SDF core are attractive candidates for solution-processable white polymer light-emitting device (WPLED) applications. † Electronic supplementary information (ESI) available: 1 H NMR and 13 C NMR characterization of DBrCz and 1 H NMR characterization of the copolymers and PFCzSDF10DBT7. UV-vis absorption of DBT and PL spectra of PFCz in CHCl 3 solution (10 À5 mol L À1 ), and PL spectra of DBT in CHCl 3 solution (10 À5 mol L À1 ). See

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hyperbranched fluorene-alt-carbazole copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the core and their application in white polymer light-emitting devices

Liang

et al. 2015

RSC Adv.

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“…Polyurethanes are industrially important polymers with various structures and wide applications [1][2][3][4] . Changes in the field of the polymers are frequently desirable as per need of the application requirements.…”

Section: Introductionmentioning

confidence: 99%

New T-Shape Polyurethanes: Synthesis, Thermal and Mechanical Properties

Issam

Hena

2012

Polymer-Plastics Technology and Engineering

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A series of new T-shaped polyurethanes were prepared from various diisocyanates and 2,5-dihydroxybenzelidene aniline (azomethine bisphenol). The latter compound was synthesized by the reaction of 2,5-dihydroxy-benzaldehyde with aniline. The structures of azomethine bisphenol and T-shaped polyurethane were confirmed by FT-IR, 1 H-NMR, 13 C-NMR Spectroscopy and elemental analysis (CHN). The mechanical properties were characterized by tensile strength, tear strength and shore hardness. Thermal properties were also studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Mechanical and thermal studies showed that the synthesized polyurethanes possess good mechanical and thermal properties. INTRODUCTIONPolyurethanes are industrially important polymers with various structures and wide applications [1][2][3][4] . Changes in the field of the polymers are frequently desirable as per need of the application requirements. Fully aromatic polymers exhibit good mechanical properties, but are limited by their low thermo-oxidative stability. A typical example was found in polyurethanes [5] . However, few researchers have paid attention to high thermal stability with good mechanical properties. The attempts either by synthesized fully aromatic polyurethanes containing phosphorus group [6][7][8][9] , substituted the aromatic by halogens [10] or inserting azomethine group in the main chain of the polyurethanes [11][12][13][14][15][16] to enhance their thermal properties.However, fully aromatic rings in the polymers backbone exhibit difficulties in the processing as well as in solubility. Therefore, the design and synthesis of polymers with better processability and high thermal stability become the key point to addressing these problems. To overcome these problems, several methods achieved such as incorporation of flexible spacers [17][18][19] , bulky alkyl substituents [20][21][22][23] and nonlinear links into the main chain of the polymers [20] .

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“…The rigid three-dimensional structures show superiority to the corresponding linear structures as light-emitting materials, because they can effectively suppress the aggregation of conjugated polymer chains and reduce the self-quenching of their luminescence [11,12] . However, for practical application, hyperbranched and star polymers showed much more potential over the structurally perfect dendrimers, since the preparation of hyperbranched or star polymers is much easier than that of dendrimers.…”

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confidence: 99%