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<p>Photophysics of 9,9-dioctylfluorene copolymers has been studied for the first time using quantum-chemical calculations. The study revealed that structural modifications of fluorene copolymers directly influence the excited-state energies and non-radiative rate constants. These tailored copolymers consequently exhibit photoluminescence tunable across the visible spectrum, from the blue-to-red spectral region. Calculations confirmed fluorescence as the dominant decay pathway and identified internal conversion as the primary cause of efficiency loss in red-emitting copolymers. Corresponding OLEDs based on fluorene copolymers have been fabricated, achieving a&#xa0;maximum luminance of 7683 cd/m<sup>2</sup> and a&#xa0;current efficiency of 1.82 cd/A for a&#xa0;green-emitting device.</p>

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Spectrally-tunable fluorene copolymers for organic light-emitting diodes

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • L. I. Valiulina,
  • K. Khoroshkin,
  • A. E. Kurtsevich,
  • E. N. Nikonova,
  • K. M. Degtyarenko,
  • V. P. Tuguldurova,
  • R. Valiyev

摘要

Photophysics of 9,9-dioctylfluorene copolymers has been studied for the first time using quantum-chemical calculations. The study revealed that structural modifications of fluorene copolymers directly influence the excited-state energies and non-radiative rate constants. These tailored copolymers consequently exhibit photoluminescence tunable across the visible spectrum, from the blue-to-red spectral region. Calculations confirmed fluorescence as the dominant decay pathway and identified internal conversion as the primary cause of efficiency loss in red-emitting copolymers. Corresponding OLEDs based on fluorene copolymers have been fabricated, achieving a maximum luminance of 7683 cd/m2 and a current efficiency of 1.82 cd/A for a green-emitting device.