Recent development of crown-substituted polyfluorenes for blue light-emitting devices in organic electronics

Rananaware, Meenakshi M.; Ghase, Vaijayanti D.; Patil, Vishwanath R.

doi:10.1007/s00289-018-2412-0

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…It was also noted that wide emission spectrum was exhibited for the group of synthesized polymers dibenzofluorene which enhances the displacement of the geometry of equilibrium from its ground state at the excited states [37,38]. Thin films for all polymers were prepared at room temperature by spin-casting (1500 rpm) on quartz plates in THF solutions (10 ppm).…”

Section: Optical Propertiesmentioning

confidence: 99%

Alkyl and allyl substituted polydibenzofluorene: blue emitters for future display applications

et al. 2020

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5,8-Dibromo-13,13-bis(alkyl)dibenzofluorene derivatives functionalized with different alkyl molecules [M2a-M2f ] and 2-tert butyl-9,10-di (p-hydroxyphenyl) anthracene [M1b], were designed to research the impact of molecular structure on the optical properties of polymer. Polymers were synthesized by aromatic nucleophilic substitution in moderate to strong yields (60-65%). After structural characterization through several techniques (e.g. FTIR, 1 H, and 13 C-NMR), special emphasis was put on the study of their optical properties through UV-Vis and photoluminescence spectroscopy. The polymers demonstrated strong thermal stability up to 350 °C and high glass transition temperature (108-133 °C). All of the polymers showed blue emission within a range of 416-433 nm and had a band gap of 2.87-2.99 eV. The electrochemical study reveals that, HOMO levels for polymers were estimated in the range of − 5.22 to − 5.26 eV and LUMO of − 2.23 to − 2.38 eV. The polymers demonstrated strong thermal stability and blue emission within a range of 416-433 nm. These polymeric materials have demonstrated high photoluminescence which may be useful for future display applications as a good source.

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Section: Optical Propertiesmentioning

confidence: 99%

Alkyl and allyl substituted polydibenzofluorene: blue emitters for future display applications

et al. 2020

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“…Polymer light‐emitting diodes (PLEDs) have attracted increasing attention in recent decades, due to their utility in flexible displays and solid‐state lighting, low energy consumption, and low driving voltage 1–7 . Full‐color displays require three primary color emitters (red, green, blue) with excellent stability, high electroluminescence efficiency, and saturated color purity 8 . However, only red and green light‐emitting polymers have been developed to this standard, 9,10 while high‐efficiency blue‐emitting polymers continue to pose substantial developmental challenges, especially deep‐blue emitters with a Commission International de L'Eclairage “y” coordinate (CIE y ) < 0.1 11 .…”

Section: Introductionmentioning

confidence: 99%

Efficient deep‐blue light‐emitting polyfluorenes based on 9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide isomers

Huang

et al. 2020

Journal of Polymer Science

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We have designed and synthesized a series of deep-blue light-emitting polyfluorenes, PF-27SOs and PF-36SOs, by introducing electron-deficient 9,9-dimethyl-9H-thioxanthene 10,10-dioxide isomers (27SO and 36SO) into the poly(9,9-dioctylfluorene) (PFO) backbone. Compared with PFO, the resulting polymers exhibit an equivalent thermal decomposition temperature (>415 C), an enhanced glass transition temperature (>99 C), a decreased lowest unoccupied molecular orbital energy level (E LUMO ) below −2.32 eV, a blue-shifted photoluminescence spectra in solid film with a maximum emission at 422 nm, and a shoulder peak at~445 nm. The resulting polymers also show blue-shifted and narrowed electroluminescence spectra with deep-blue Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.07) for PF-27SO20 and (0.16, 0.06) for PF-36SO30, compared with (0.17, 0.13) for PFO.Moreover, simple device based on PF-36SO30 achieves a superior device performance with a maximum external quantum efficiency (EQE max = 3.62%) compared with PFO (EQE max = 0.47%). The results show that nonconjugated 9,9-dimethyl-9H-thioxanthene 10,10-dioxide isomers can effectively perturb the conjugation length of polymers, significantly weaken the charge-transfer effect in donor-acceptor systems, substantially improve electroluminescence device efficiency, and achieve deep-blue light emission.

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Benzo crown ether functionalized conjugated polyfluorenes with anthracene fragment for sustainable light-emitting device technology

et al. 2021

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Recent development of crown-substituted polyfluorenes for blue light-emitting devices in organic electronics

Cited by 7 publications

References 47 publications

Alkyl and allyl substituted polydibenzofluorene: blue emitters for future display applications

Alkyl and allyl substituted polydibenzofluorene: blue emitters for future display applications

Efficient deep‐blue light‐emitting polyfluorenes based on 9,9‐dimethyl‐9H‐thioxanthene 10,10‐dioxide isomers

Benzo crown ether functionalized conjugated polyfluorenes with anthracene fragment for sustainable light-emitting device technology

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