Modification of Thermally Activated Delayed Fluorescence Emitters Comprising Acridan–Pyrimidine and Spiro-Acridan–Pyrimidine Moieties for Efficient Triplet Harvesting DOI Creative Commons
Rita Butkutė, Steponas Raišys, Tomas Serevičius

и другие.

ACS Applied Electronic Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

In this study, we investigate the effect of substitution and conformational impact on photophysical properties novel 5-methylpyrimidine derivatives containing electron-donating groups with distinct rigidity. Research has revealed that all compounds showed pronounced thermally activated delayed fluorescence (TADF) features. The addition spiro-acridan moiety eliminated dual emission, simplifying behavior compounds. Compounds units exhibited a larger singlet–triplet energy gap, resulting in reduced reverse intersystem crossing rate an extended TADF lifetime both toluene solutions PMMA films. Additionally, intensity was higher these compounds, which attributed to slower nonradiative triplet quenching rate. Embedding into rigid matrix significantly increases quantum yield emission by minimizing deactivation caused intramolecular twisting. considerable disorder polymer-doped films leads multiexponential decay noticeable shifts prompt time-resolved spectra. attachment moieties at fourth position reduces due restriction rotations methyl attachment.

Язык: Английский

Modification of Thermally Activated Delayed Fluorescence Emitters Comprising Acridan–Pyrimidine and Spiro-Acridan–Pyrimidine Moieties for Efficient Triplet Harvesting DOI Creative Commons
Rita Butkutė, Steponas Raišys, Tomas Serevičius

и другие.

ACS Applied Electronic Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

In this study, we investigate the effect of substitution and conformational impact on photophysical properties novel 5-methylpyrimidine derivatives containing electron-donating groups with distinct rigidity. Research has revealed that all compounds showed pronounced thermally activated delayed fluorescence (TADF) features. The addition spiro-acridan moiety eliminated dual emission, simplifying behavior compounds. Compounds units exhibited a larger singlet–triplet energy gap, resulting in reduced reverse intersystem crossing rate an extended TADF lifetime both toluene solutions PMMA films. Additionally, intensity was higher these compounds, which attributed to slower nonradiative triplet quenching rate. Embedding into rigid matrix significantly increases quantum yield emission by minimizing deactivation caused intramolecular twisting. considerable disorder polymer-doped films leads multiexponential decay noticeable shifts prompt time-resolved spectra. attachment moieties at fourth position reduces due restriction rotations methyl attachment.

Язык: Английский

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