Optoelectronic properties of poly(fluorene) co‐polymer light‐emitting devices on a plastic substrate*

Kanicki, Jerzy; Lee, Shu Jen; Hong, Yongtaek; Su, Chia Chen

doi:10.1889/1.2150379

Cited by 8 publications

(6 citation statements)

References 37 publications

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“…Fig. 5 shows the light transmittance spectra of LCD color filter [10] and light emission spectra of the AM-PLED [11]. Their maximum blue, green and red responses are about 450, 550 and 650nm, respectively.…”

Section: Under Illuminationmentioning

confidence: 99%

P‐13: Photosensitivity of Amorphous IGZO TFTs for Active‐Matrix Flat‐Panel Displays

Chuang

Fung

Mullins

et al. 2008

Symp Digest of Tech Papers

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We studied the optical and electrical properties of the amorphous indium gallium zinc oxide thin‐film transistors (a‐IGZO TFTs). To develop a‐IGZO density‐of‐states model, intrinsic a‐IGZO optical properties such as optical band gap and Urbach energy, and TFT characteristics under illumination are investigated. During the a‐IGZO TFTs illumination with the wavelengths ranging from 460 to 660 nm, the off‐state drain current only slightly increases while a large increase was observed for the wavelength below 400 nm. Threshold voltage and subthreshold swing are also only slightly modified between 460 to 660 nm, while field‐effect mobility is almost unchanged in the investigated photon energy range. The observed results are consistent with the a‐IGZO optical energy band gap of about 3.05 eV. This study suggest that the a‐IGZO TFTs are light sensitive above 3.0 eV and photogenerated electrons are more mobile than holes within device channel region.

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Section: Under Illuminationmentioning

confidence: 99%

P‐13: Photosensitivity of Amorphous IGZO TFTs for Active‐Matrix Flat‐Panel Displays

Chuang

Fung

Mullins

et al. 2008

Symp Digest of Tech Papers

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“…However, PF‐PFCB film shows a dielectric constant of about 2.43 with low dissipation factor. These results indicate that PFO exhibits semiconductive behavior, whereas PF‐PFCB could be considered as an insulator at high frequencies. Moreover, we can predict that if PFO and PF‐TFVE were mixed with different ratios, or 9,9‐dioctylfluorene and monomer 2 were copolymerized via different ratios, the new polymers we got after postpolymerizations would show variable dielectric properties.…”

Section: Resultsmentioning

confidence: 85%

Variable Polymer Properties Driven by Substituent Groups: Investigation on a Trifluorovinylether‐Functionalized Polyfluorene at the C‐9 Position

Wang

Yuan

et al. 2015

Macro Chemistry & Physics

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A new polyfluorene PF‐TFVE with functional trifluorovinylether (–OCF=CF2) groups at the C‐9 position is reported. When heated to high temperatures, the polymer converts to a cross‐linked network (PF‐PFCB), which exhibits much lower dielectric constant and dissipation factor at high frequency than a traditional octyl substituted polyfluorene (PFO) (cf., PF‐PFCB: 2.42 and 0.048; PFO: 3.80 and 0.22 @ 30 MHz). The electronic spectra of PF‐PFCB indicate that it exhibits weaker UV–vis absorption and photoluminescent emission than PFO in the solid state, suggesting that the big substituent groups and the cross‐linked networks in PF‐PFCB hinder the conjugation between two fluorene units. This is the first example revealing that dielectric properties of polyfluorenes can be varied by different substituent groups at the C‐9 position. These results indicate that polyfluorenes can not only be considered as semiconductors, but also as insulators.

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“…These values are comparable to those reported in the literature for fluorene copolymers. 36,37 The ionization potential is smaller than in the polyfluorene (5.8 eV).…”

Section: Electrochemical Characterizationmentioning

confidence: 96%

Synthesis and electrochemical characterization of new linear conjugated arylamine copolymers

Vacareanu¹,

Grigoraş²

2011

High Performance Polymers

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New conjugated copolymers having linear structures were synthesized by palladium catalyzed cross-coupling reactions of bis(4-bromophenyl)phenylamine or 4-hydroxymethyl-N,N’-bis(4-bromophenyl)aniline and two bisboronic acids of fluorene or thiophene. The copolymers were obtained as fully or partially soluble materials, in chlorinated and aprotic polar solvents. Having a hydroxymethyl group attached to the para position of the triphenylamine units, the synthesized copolymers can be viewed as functional polymers which were transformed into new ones by employing suitable chemical reactions. A new copolymer was obtained by coupling the hydroxymethyl group of triphenylamine of P35 copolymer, with phenyl isocyanate. The chemical structures and the properties of copolymers were investigated by spectroscopic methods such as 1H nuclear magnetic resonance, Fourier transform infrared, ultraviolet-Vis and photoluminescence spectroscopy. Cyclic voltammetry was performed in order to obtain information about the electrochemical stability and reversibility of the redox processes of copolymers. Electrochemical studies were carried out on films cast on glassy carbon electrode (GCE) or In-Tin oxide (ITO) glass-coated electrode.

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Optoelectronic properties of poly(fluorene) co‐polymer light‐emitting devices on a plastic substrate*

Cited by 8 publications

References 37 publications

P‐13: Photosensitivity of Amorphous IGZO TFTs for Active‐Matrix Flat‐Panel Displays

P‐13: Photosensitivity of Amorphous IGZO TFTs for Active‐Matrix Flat‐Panel Displays

Variable Polymer Properties Driven by Substituent Groups: Investigation on a Trifluorovinylether‐Functionalized Polyfluorene at the C‐9 Position

Synthesis and electrochemical characterization of new linear conjugated arylamine copolymers

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