Novel green-emitting polymer containing fluorene and 1-(2-benzothiazolyl)-3,5-diphenylpyrazoline

Zhang, Huaxi; Liu, Ying; Jiang, Qing; Xie, Minggui; Peng, Junbiao; Cao, Yong

doi:10.1007/s10853-006-0234-1

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…These emission spectra have a vibronic structure partially resolved as usually observed for fluorene-based polymers. [2][3][4][5][6][7][8][10][11][12][13][14][15][16][17] Furthermore, the emission profile is similar for all solvents with small spectral shifts (λ max = 415 nm for chloroform, λ max = 412 nm for toluene, λ max = 414 nm for THF and λ max = 416 nm for ethyl acetate). Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] Several of them are also electroluminescent materials. 1,[4][5][6][7][8][9] The backbone of fluorene-based polymers contains a rigidly planar biphenyl structure which can be functionalized in the C-9 position to enhance the polymer solubility. Nevertheless, this substitution at C-9 induces minor steric effects in the adjacent aromatic rings, 10 leading, in general, to small geometrical disturbance.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4]22,23 The reason for such differences is the occurrence of aggregation process that influences not only the spectral profile but also the emission intensity. In particular for conjugated polymers which undergo photo and electroluminescence, [1][2][3][4][5][6][7][8][9] it has been observed in several cases that both emissions are very similar, and thus the knowledge of the solid state emission is important. Here we compare the spectral profile of PHF in solid state and in dilute solutions in an attempt to identify the lumophores responsible by the emission.…”

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confidence: 99%

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Photophysical properties and quantum chemical studies of poly(2,7-9,9'-dihexylfluorene-dyil)

Oliveira¹,

Martins²,

Honório³

et al. 2009

J. Braz. Chem. Soc.

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Este trabalho descreve as propriedades fotofísicas (espectros de excitação e de fluorescência, rendimento quântico e tempo de meia-vida de fluorescência) do poli(2,7-9,9'diexil-fluoreno-diil) em soluções diluídas, de quatro solventes (tolueno, tetraidrofurano, clorofórmio e acetato de etila) e no estado sólido. Os espectros de fotoluminescência são característicos da conformação desordenada da cadeia principal, denominada forma α. Espectros eletrônicos de absorção foram simulados para oligômeros de 1 a 11 meros, indicando que o comprimento crítico de conjugação está entre 6 e 7 meros. Os valores teóricos do momento de dipolo mostraram que a conformação helicoidal formada se repete a cada 8 unidades por volta. Mostra-se ainda que no estado sólido ocorrem processos de transferência de energia que levam a uma diminuição do tempo de meia-vida de fluorescência. Com base nos espectros obtidos, pode-se concluir que a fotoluminescência e a eletroluminescência descrita na literatura são provenientes das mesmas unidades emissoras.This work reports the photophysical properties (excitation and fluorescence spectra, fluorescence quantum yield, fluorescence lifetimes) of the poly(2,7-9,9'-dihexylfluorene-dyil) in dilute solutions of four solvents (toluene, tetrahydrofuran, chloroform and ethyl acetate) as well as the properties in solid state. Photoluminescence showed spectra characteristic of disordered α-backbone chain conformation. Simulation of the electronic absorption spectra of oligomers containing 1 to 11 mers showed that the critical conjugation length is between 6 and 7 mers. We also estimated the theoretical dipole moments which indicated that a coil conformation is formed with 8 repeating units per turn. We also showed that some energy transfer process appears in solid state which decreases the emission lifetime. Furthermore, based on luminescent response of the systems herein studied and electroluminescent behavior reported on literature, both photo and electroluminescence emissions arise from the same emissive units.Keywords: polyfluorene, photophysical properties, quantum mechanical calculation, photoluminescence IntroductionPolyfluorene and derivates form a class of conjugated polymers whose photoluminescence emission is strongly dependent on their chemical structure ranging from the violet to red.1-8 Several of them are also electroluminescent materials.1,4-9 The backbone of fluorene-based polymers contains a rigidly planar biphenyl structure which can be functionalized in the C-9 position to enhance the polymer solubility. Nevertheless, this substitution at C-9 induces minor steric effects in the adjacent aromatic rings, 10 leading, in general, to small geometrical disturbance. It is also well known that some polyfluorenes in solid state may form liquid-crystalline phases, with high ordered crystalline phases with thermotropic phase transition from 100 to 170 °C.11 Moreover, the polymer chain may be organized in the solid state undergoing phase structure with different spectral properties: more ordered α-pha...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Photophysical properties and quantum chemical studies of poly(2,7-9,9'-dihexylfluorene-dyil)

Oliveira¹,

Martins²,

Honório³

et al. 2009

J. Braz. Chem. Soc.

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“…These conjugated polymers are materials with a great variety of chemical structures, synthesized by distinct procedures, with multiple functionalities conferring different colors to operating devices, from violet to red [3][4][5][6][7][8][9][10][11][12][13][14]. Each one of these particular chemical structures may have distinct physical, chemical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH–PPV and Poly(9,9′-dioctylfluorene-2,7-diyl)

Cossiello

Susman

Aramendı́a

et al. 2010

Journal of Luminescence

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“…On the other hand, PLEDs can be prepared using the spin coating and inkjet printing methods, which means that they can be manufactured at low cost. [4][5][6][7] In addition, PLEDs can be applied to flexible displays using large and rollable plastic substrates. The PLED is current operational device which emit the light through the recombination of excitons injected from anode and cathode electrodes.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Annealing Effect of PFO-Poss Emission Layer on the Properties of Polymer Light Emitting Diodes

Gong¹,

Chang²

2009

Korean. J. Mater. Res.

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Polymer Light Emitting Diodes (PLEDs) with an ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al structure were prepared on plasma-treated ITO/glass substrates using spin-coating and thermal evaporation methods. The annealing effects of the PFO-poss film when it acts as the emission layer were investigated by using electrical and optical property measurements. The annealing conditions of the PFO-poss emission film were 100 and 200 o C for 1, 2 and 3 hours, respectively. The luminance increased and the turn-on voltage decreased when the annealing temperature and treatment time increased. After examining the Luminance-Voltage (L-V) properties of the PLED, the maximum luminance was found to be 1497 cd/m 2 at 11 V for the device when it was annealed at 200 o C for 3 hours. The peak intensity of the PLED emission spectra at approximately 525 nm in wavelength increased when the annealing temperature and time of the PFO-poss film increased. These results suggest that the light emission color shifted from blue to green.

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Novel green-emitting polymer containing fluorene and 1-(2-benzothiazolyl)-3,5-diphenylpyrazoline

Cited by 8 publications

References 14 publications

Photophysical properties and quantum chemical studies of poly(2,7-9,9'-dihexylfluorene-dyil)

Photophysical properties and quantum chemical studies of poly(2,7-9,9'-dihexylfluorene-dyil)

Study of solvent-conjugated polymer interactions by polarized spectroscopy: MEH–PPV and Poly(9,9′-dioctylfluorene-2,7-diyl)

Low Temperature Annealing Effect of PFO-Poss Emission Layer on the Properties of Polymer Light Emitting Diodes

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