Improving the electroluminescence performance of blue light-emitting poly(fluorene-co-dibenzothiophene-S,S-dioxide) by tuning the intra-molecular charge transfer effects and temperature-induced orientation of the emissive layer structure

Hu, Liwen; Liang, Junfei; Zhong, Wenkai; Guo, Tao; Zhong, Zhou; Peng, Feng; Fan, Baobing; Ying, Lei; Cao, Yong

doi:10.1039/c9tc00842j

Cited by 11 publications

(7 citation statements)

References 39 publications

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“…And the corresponding highest luminance is calculated about 939 cd/m 2 at 296 mA/cm 2 , and 1877 cd/m 2 at 232 mA/cm 2 , respectively. In this regard, the PLED based on the POEYDPF cross-linked film presents comparable performance to the many previous deep-blue PLEDs. ,,− But this is not the optimal device efficiency, compared to the ultrahigh performance deep-blue PLEDs reported in previous works (∼7.3 cd/A). ,− Device performance of deep-blue LCPs via cross-linked strategy can be further enhanced by introducing the functional units, such as phosphine oxide, triphenylamine (TPA), carbazole (Cz), triazole (TAZ), and dibenzothiophene- S , S dioxide (SO) units, which can obviously improve their electron/hole injection/transportation ability. ,− Compared to the freely liner conjugated chain, the cross-linked network of LCPs will effectively suppress chain segmental motion, chain recrystallization and molecular aggregation under Joule self- heating in long-time device operation (Current density >100 mA/cm 2 ). ,, The PLED based on cross-linked film has stable deep-blue emission and high device performance at high current density than those based on pristine ones.…”

Section: Resultsmentioning

confidence: 92%

Enhancing the Deep-Blue Emission Property of Wide Bandgap Conjugated Polymers through a Self-Cross-Linking Strategy

Sun

et al. 2022

ACS Appl. Polym. Mater.

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Interchain aggregation is adverse to the stability and performance of wide bandgap light-emitting conjugated polymers (LCPs) and their optoelectronic devices, associated with the electron coupling of the backbone chain. Chain-segmental motion is a fundamental factor to cause interchain aggregation under film post-treatment, device fabrication, and Joule self-heating in device operation. Herein, the suppression of the chain motion through the cross-linking chemical successfully avoided the aggregationinduced residual physical defect emission in wide band gap polyfluorene (POEYDPF). Compared to pristine ones, high Young's modulus (E r ) and hardness (H) of cross-linked film effectively confirmed the rigid physical molecular landscape of the POEYDPF chain with low chain segmental motion and dense random interchain packing. According to the ultrafast spectroscopic spectral analysis, this residual defect emission at long wavelength can be suppressed in this rigid cross-linked network. As a result, the crosslinked film presents a deep-blue lasing behavior with an extremely low threshold of 0.70 μJ/cm 2 , attributed to the low optical loss in the cross-linked topological network. Finally, efficient and stable deep-blue PLEDs with three well-resolved emission peaks of single-chain are also fabricated with a high current efficiency (C.E.) of 1.57 cd/A (twice that of the pristine ones).

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Section: Resultsmentioning

confidence: 92%

Enhancing the Deep-Blue Emission Property of Wide Bandgap Conjugated Polymers through a Self-Cross-Linking Strategy

Sun

et al. 2022

ACS Appl. Polym. Mater.

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“…2,7‐Bis(4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolan‐2‐yl)‐9,9‐dioctylfluorene ( M4 ), 2,7‐dibromo‐9,9‐dioctylfluorene ( M3 ) were synthesized according to previous literatures 25,27 …”

Section: Methodsmentioning

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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“…For instance, after the planar polymer devices are prepared, various annealing treatments are usually carried out to stabilize and enhance the photoelectric properties of polymer devices. [40][41][42][43] Inspired by this, it is valuable to carry out optimization, a treatment similar to thermal annealing after the precipitation synthesis of Pdots.…”

Section: Introductionmentioning

confidence: 99%

Luminescence-enhanced conjugated polymer dots through thermal treatment for cell imaging

Yang

Shi

et al. 2022

Biomater. Sci.

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Improving the electroluminescence performance of blue light-emitting poly(fluorene-co-dibenzothiophene-S,S-dioxide) by tuning the intra-molecular charge transfer effects and temperature-induced orientation of the emissive layer structure

Abstract: A luminous efficiency of 7.30 cd A−1 was achieved in PFSO10TA2 as a result of temperature-induced orientation.

Cited by 11 publications

References 39 publications

Enhancing the Deep-Blue Emission Property of Wide Bandgap Conjugated Polymers through a Self-Cross-Linking Strategy

Enhancing the Deep-Blue Emission Property of Wide Bandgap Conjugated Polymers through a Self-Cross-Linking Strategy

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

Luminescence-enhanced conjugated polymer dots through thermal treatment for cell imaging

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