Fluorescence quenching by charge carriers in indolo[3,2-b]carbazole-based polymer

Karpicz, Renata; Kirkus, Mindaugas; Gražulevičius, Juozas V.; Gulbinas, Vidmantas

doi:10.1016/j.jlumin.2009.11.029

Cited by 9 publications

(11 citation statements)

References 34 publications

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“…Figure 1͑b͒ shows the spectral dependence of the fluorescence quenching efficiency Q = ͑F 0 − F V ͒ / F 0 at an applied voltage of 13 V. Here, F 0 and F V are fluorescence intensities without and with an applied voltage, respectively. 31 The current in our samples under an applied 13 V reverse voltage was ϳ100 nA/ cm 2 only, and no signatures of the carrier accumulation were observed. At 80 K, the quenching efficiency is close to 40% in the short wavelength range, but only about 25% in the long wavelength range.…”

Section: A Electric Field-induced Fluorescence Quenchingmentioning

confidence: 62%

Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole)

Devižis

Serbenta

Peckus

et al. 2010

The Journal of Chemical Physics

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The dynamics of charge carrier generation in poly(spirobifluorene-co-benzothiadiazole) was investigated by electric field-induced fluorescence quenching and differential absorption measurements. Three different time domains of carrier generation have been identified: an ultrafast phase, a subnanosecond phase, and an entire lifetime phase. The charge generation efficiencies during the first and second phases were found to be almost independent of temperature, being about 25% and 10%, respectively, at an applied electric field of 1.3×10(6) V/cm, while the generation efficiency during the third phase increases from 2% at 80 K to 10% at room temperature. The results of transient spectroscopy measurements and quantum chemical calculations suggest an intramolecular charge transfer for about 1 ps from the alkoxy-substituted fluorene side group to the benzothiadiazole subunit of the main chain. The formation and evolution of the resulting charge transfer states determine the way of charge carrier generation.

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Section: A Electric Field-induced Fluorescence Quenchingmentioning

confidence: 62%

Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole)

Devižis

Serbenta

Peckus

et al. 2010

The Journal of Chemical Physics

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“…As the high interfacial charge density is a distinguishing feature of organic field-effect devices, this behavior could not be observed in diode-like structures with much lower charge density. 8,9,19,48 ■ DISCUSSION On the basis of the interpretation of the PLEM data discussed in the last section, we now develop a kinetic description of the charge−exciton interaction process. In order to introduce a reliable and effective model, three issues must be considered with attention.…”

Section: ■ Resultsmentioning

confidence: 99%

Charge–Exciton Interaction Rate in Organic Field-Effect Transistors by Means of Transient Photoluminescence Electromodulated Spectroscopy

et al. 2017

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Organic light-emitting transistors (OLETs) offer a huge potential for the design of highly integrated multifunctional optoelectronic systems and of intense nanoscale light sources, such as the long-searched-for electrically pumped organic laser. In order to fulfill these promises, the efficiency and brightness of the current state-of-the-art devices have to be increased significantly. The dominating quenching process limiting the external quantum efficiency in OLETs is charge−exciton interaction. A comprehensive understanding of this quenching process is therefore of paramount importance. The present article reports a systematic investigation of charge−exciton interaction in organic transistors employing timeresolved photoluminescence electro-modulation (PLEM) spectroscopy on the picosecond time scale. The results show that the injected charges reduce the exciton radiative recombination in two ways: (i) charges may prevent the generation of excitons and (ii) charges activate a further nonradiative channel for the exciton decay. Moreover, the transient PLEM measurements clearly reveal that not only trapped charges, as already reported in literature, but rather the entire injected charge density contributes to the quenching of the exciton population.

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“…Meanwhile, carbazole building block is easy to be functionalized at either nitrogen or aromatic backbones. With all these advantages, carbazole has been widely used and studied in photoluminescent and electronic materials (Grazulevicius et al, 2003; Kundu et al, 2003; Grigalevicius, 2006; Blouin and Leclerc, 2008; Karpicz et al, 2010; Chen et al, 2011; Li et al, 2012; Ooyama et al, 2012; Uoyama et al, 2012; Nishimoto et al, 2014; Yang et al, 2016; Wex and Kaafarani, 2017; Meier et al, 2019). o -Carborane (1,2-dicarba- closo -dodecaborane) hosts electronic deficient property due to the uniquely delocalized 3-center-2-electron bond on its electron withdrawing icosahedron boron cluster skeleton, and possesses highly polarized σ-aromatic character (Naito et al, 2015; Cho et al, 2016; Wu X. Y. et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Aggregation-Induced Fluorescence of Carbazole and o-Carborane Based Organic Fluorophore

Jiao

Kang

et al. 2019

Front. Chem.

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Carbazole based fluorophores 9-butyl-3,6-bis-(phenylethynyl)-9H-carbazole (1) and 9-butyl-3,6-bis-(2-phenyl-o-carborane)-9H-carbazole (2) were synthesized via Sonogashira type cross-coupling reaction and followed by insertion with decaborane. Compound 1 exhibited far more intense fluorescence than 2 in THF solution, while in solid state 2 exerted stronger fluorescence than 1. The fluorescence quenching behavior of 2 in THF solution could be attributed to the intramolecular charge transfer of donor-acceptor system in 2, which was confirmed by electrochemical experiments and DFT calculations. The fluorescence enhancement of 2 in solid state can be ascribed to aggregational induced packing which was evidenced by crystallographic study. In addition, compound 2 showed typical aggregation induced emission (AIE) behavior.

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Fluorescence quenching by charge carriers in indolo[3,2-b]carbazole-based polymer

Cited by 9 publications

References 34 publications

Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole)

Electric field assisted charge carrier photogeneration in poly(spirobifluorene-co-benzothiadiazole)

Charge–Exciton Interaction Rate in Organic Field-Effect Transistors by Means of Transient Photoluminescence Electromodulated Spectroscopy

Aggregation-Induced Fluorescence of Carbazole and o-Carborane Based Organic Fluorophore

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