In this article, a series of fluorene/2,5‐dithenyl‐1H‐pyrrole‐based electroactive polymers (HS‐X) with different feed ratio of SC12F/OF were synthesized via Suzuki coupling reactions. Chemical characterization of polymers was elucidated by ¹H NMR and Fourier‐transform infrared spectroscopy. Electrochemical and electrophysical characterization of the synthesized polymers were investigated by cyclic voltammetry, UV‐vis spectroscopy, and fluorescence spectroscopy. Thermal stability of polymers were studied with differential scanning calorimetry and manipulation of the Tg values of HS‐X polymers was managed by increasing the numbers of the spiroalkylated fluorene (SAF) moieties incorporated into the polymer backbone. Five different conjugated polymers (HS‐1, HS‐2, HS‐3, HS‐4, and HS‐5) were used as hole transport layer material in the fabrication of organic light‐emitting diode (OLED) devices. The energy levels of the highest occupied molecular orbital as well as the lowest unoccupied molecular orbital and photoluminescence intensities were independent of the number of SAF units. OLED devices based on HS‐X polymers were fabricated according to ITO/PEDOT:PSS/HS‐X/Alq3/LiF:Al device configuration. Their electroluminescence performances were investigated and the best performance were obtained with the polymer containing 20% SC12F (HS‐4) in an OLED device with a turn on voltage of 11.8 V, a maximum luminance of 1202 cd/m² and a maximum luminous efficiency of 0.30 cd/A compared to other polymers with different feed ratio.

中文翻译：

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一系列芴/ 2,5-二（2-噻吩基）-1H-吡咯聚合物的电致发光性能

在本文中，通过Suzuki偶联反应合成了具有不同进料比SC12F / OF的一系列芴/ 2,5-二噻吩基-1 H-吡咯基电活性聚合物（HS-X）。聚合物的化学表征用¹阐明1 H NMR和傅立叶变换红外光谱。通过循环伏安法，紫外可见光谱和荧光光谱研究了合成聚合物的电化学和电物理特性。用差示扫描量热法研究了聚合物的热稳定性，并通过增加掺入聚合物主链的螺烷基化芴（SAF）部分的数量来控制HS-X聚合物的Tg值。五个不同的共轭聚合物（HS-1，HS-2，HS-3，HS-4和HS-5）被用作制造有机发光二极管（OLED）器件的空穴传输层材料。最高占据分子轨道的能级以及最低未占据分子轨道的能级和光致发光强度与SAF单位数无关。根据ITO / PEDOT：PSS / HS-X / Alq3 / LiF：Al器件配置制造基于HS-X聚合物的OLED器件。研究了它们的电致发光性能，并在OLED器件中使用含20％SC12F（HS-4）的聚合物，并在11.8 V的开启电压，1202 cd / m的最大亮度下获得了最佳性能。^{如图2所示}，与具有不同进料比的其他聚合物相比，最大发光效率为0.30cd / A。