Theoretical and experimental study of PTDPV optical and vibrational properties and its application in white electroluminescent blends

Renzi, Wesley; Moraes, T. dos S.; Cordeiro, Neusmar J. A.; Santana, Henrique de; Costa, Marcello F.; Silva, M.A.T. da; Laureto, Édson; Duarte, José Leonil

doi:10.1016/j.synthmet.2019.03.017

Cited by 1 publication

(1 citation statement)

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“…One of the main advantages of polymers is their flexibility and mechanical malleability, which has been widely explored to manufacture flexible electronic devices, displays, sensors, and even ambient lighting. − These unique properties enable the development of lightweight, thin, and even transparent devices, paving the way for a variety of innovative applications in organic electronics. − …”

Section: Introductionmentioning

confidence: 99%

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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