Synthesis and electroluminescent properties of a phenothiazine‐based polymer for nondoped polymer light‐emitting diodes with a stable orange‐red emission
Synthesis and electroluminescent properties of a phenothiazine‐based polymer for nondoped polymer light‐emitting diodes with a stable orange‐red emission
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DOI：
10.1002/pola.22237
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
Yingliang Liu;Huayu Cao;Jianghui Li;Zhijian Chen;S. Cao;Lixin Xiao;Shengang Xu;Q. Gong
中科院分区：
文献类型：
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作者：
Yingliang Liu;Huayu Cao;Jianghui Li;Zhijian Chen;S. Cao;Lixin Xiao;Shengang Xu;Q. Gong
通过3，7-二乙烯基-N-辛基吩噻嗪与4，7-二溴-2-辛基苯并三氮唑的Heck反应，采用交替给体-受体策略合成了一种新型吩噻嗪基聚合物。用1H NMR、红外光谱、凝胶渗透色谱、循环伏安、紫外-可见光谱和荧光光谱对聚合物进行了表征。以该聚合物为有源层，采用旋涂法制备了三种具有双层结构的非掺杂聚合物发光二极管（PLED），并对其进行了不同的热退火处理。电致发光光谱的最大发射波长稳定在616 nm。最大亮度达到2432 cd/m 2。热处理后的双层PLED的Commission International de l 'Eclairage 1931坐标值几乎稳定在（x，y）=（0.62，0.38）。此外，器件II的发光效率随着电流的增加而达到平衡状态。因此，该聚合物在不同的驱动电压下具有稳定的色坐标的橙红色发射。最后，得到了具有稳定的发光效率和色度的非掺杂器件。
A novel phenothiazine-based polymer was synthesized through the Heck reaction of 3,7-divinyl-N-octyl-phenothiazine with 4,7-dibromo-2-octylbenzotriazole according to the alternating donor-acceptor strategy. The polymer was characterized with 1 H NMR, infrared spectroscopy, gel permeation chromatography, cyclic voltammetry, ultraviolet-visible spectroscopy, and fluorescence spectroscopy. With the polymer used as an active layer, three nondoped polymer light-emitting diodes (PLEDs) with a double-layer configuration were fabricated by the spin-coating approach with different thermal annealing processes. The emission maximum in electroluminescent spectra was stabilized at 616 nm. The maximum luminance reached 2432 cd/m 2 . The coordinate value of Commission International de l'Eclairage 1931 in the double-layer PLEDs after the thermal treatment was nearly stabilized at (x, y) = (0.62, 0.38). Additionally, the luminous efficiency of device II reached a balanceable state with an increase in the current. Therefore, the polymer had an orange-red emission with stable chromaticity coordinates under different driving voltages. Finally, a nondoped device with a stable luminous efficiency and chromaticity was obtained.