Viscosity-induced dual-emission of europium ions containing metallopolymer

Campos, Emerson C.G.; Turchetti, Denis A.; Santana, Alisson J.; Domingues, Raquel Aparecida; Duarte, Luís Gustavo Teixeira Alves; Atvars, Teresa Dib Zambon; Akcelrud, Leni

doi:10.1016/j.synthmet.2020.116686

Cited by 3 publications

(3 citation statements)

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“…The benzothiadiazole present in L54 and in the FB chromophores is an excellent electron acceptor. 15,25 For L76-1, which contains 70% FB, most of the excitation of FT will be transferred to the acceptor. However, in L76-2, which contains 30% of FB, there are fewer available states for ET and the decay time of FB is approximately 2.5 times longer than that of FT, thus, the emission of the acceptor saturates, leading to a decrease in ETE.…”

Section: Calculation Of Energy Transfer Efficiency 331 By Lifetimementioning

confidence: 99%

“…23,24 Based on this, the material studied in this work was a new terpolymer LaPPS76 (L76), synthesized at the Paulo Scarpa Polymers Laboratory at the Federal University of Parana( UFPR), composed of the copolymers fluorene-benzothiadiazole (L54) and fluorene-terpyridine (L75). Benzothiadiazole is an excellent electron acceptor, 15,25 and there is an overlap between the emission spectrum of L75 and the absorption spectrum of L54, suggesting a high possibility of internal energy transfer within L76.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the low-cost production of semiconductor polymers and the ease of manipulating their physical and chemical properties through small changes in their molecular chain have arisen significant scientific and industrial interest . Researchers have dedicated great effort to synthesizing new polymers with enhanced properties, such as higher energy conversion efficiency, improved thermal stability, and high light emission. ,− …”

Section: Introductionmentioning

confidence: 99%

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Intramolecular Energy Transfer in the Terpolymer LaPPS76

dos S. Moraes,

Uhdre,

de J. Santana

et al. 2024

J. Phys. Chem. C

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Due to the advancements in the OLED technology, research on new materials as active layers for the production of OLED devices has grown steadily. The synthesis of new polymers has been investigated to obtain characteristics that optimize the intensity, durability, and emission of the spectra of the OLEDs in specific spectral regions. The terpolymer LaPPS76 (L76) has a structure that combines segments of copolymers fluorenebenzothiadiazole (L54) and fluorene-terpyridine (L75). This study characterized the emission of terpolymer L76 and quantified the energy transfer (ET) processes between these chromophores. Solutions of L76 diluted in tetrahydrofuran (THF) were prepared with two relative percentages of chromophores. Additionally, mixtures of copolymers L75 and L54 were prepared, in the same proportions as they appear in the terpolymer, to compare the emission properties of the blends with those of the terpolymers. The optical characterization of L76 revealed that internal ET occurs within the molecule, from fluorene-terpyridine (FT) to fluorene-benzothiadiazole (FB), and ET saturation is observed for higher percentages of FT. The comparison between the emission from the blend and the one from the terpolymer, as a function of the solution concentration, highlights the difference in transfer processes. The efficiency of ET was quantified through calculations based on the lifetime and Forster radius, both showing higher ET efficiency in the terpolymers. The material with the highest donor concentration achieved an ET efficiency of nearly 100%, as calculated using the Forster radius.

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Section: Calculation Of Energy Transfer Efficiency 331 By Lifetimementioning

confidence: 99%