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Blue-Light-Emitting Oligoquinolines: Synthesis, Properties, and High-Efficiency Blue-Light-Emitting Diodes

机译:发射蓝光的寡喹啉:合成,性质和高效发光二极管。

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The synthesis, photophysics, cyclic voltammetry, and highly efficient blue electroluminescence of a series of four new n-type conjugated oligomers, 6,6′-bis(2,4-diphenylquinoline) (B1PPQ), 6,6′-bis(2-(4-ferf-butylphenyl)-4-phenylquinoline) (BtBPQ), 6,6′-bis(2-p-biphenyl)-4-phenylquinoline) (B2PPQ), and 6,6′-bis((3,5-diphenylbenzene)-4-phenylquinoline) (BDBPQ) is reported. The oligoquinolines have high glass-transition temperatures (T_g ≥133℃), reversible electrochemical reduction, and high electron affinities (2.68-2.81 eV). They emit blue photoluminescence with 0.73-0.94 quantum yields and 1.06-1.42 ns lifetimes in chloroform solutions. High-performance organic light-emitting diodes (OLEDs) with excellent blue chromaticity coordinates are achieved from all the oligoquinolines. OLEDs based on B2PPQ as the blue emitter give the best performance with a high brightness (19 740 cdm~(-2) at 8.0 V), high efficiency (7.12 cdA~(-1) and 6.56% external quantum efficiency at 1175 cd m~(-2)), and excellent blue color purity as judged by the Commission Internationale de L'Eclairage (CIE) coordinates (x = 0.15, y = 0.16). These results represent the best efficiency of blue OLEDs from neat fluorescent organic emitters reported to date. These results demonstrate the potential of oligoquinolines as emitters and electron-transport materials for developing high-performance blue OLEDs.
机译:一系列四个新的n型共轭低聚物6,6'-双(2,4-二苯基喹啉)(B1PPQ),6,6'-bis(2)的合成,光物理,循环伏安法和高效的蓝色电致发光-(4-叔丁基苯基)-4-苯基喹啉)(BtBPQ),6,6'-双(2-对联苯基)-4-苯基喹啉)(B2PPQ)和6,6'-bis((3,据报道有5-二苯基苯)-4-苯基喹啉(BDBPQ)。寡喹啉具有较高的玻璃化转变温度(T_g≥133℃),可逆的电化学还原和较高的电子亲合力(2.68-2.81 eV)。它们在氯仿溶液中发出蓝色光致发光,量子产率为0.73-0.94,寿命为1.06-1.42 ns。从所有的寡喹啉中获得了具有出色的蓝色色度坐标的高性能有机发光二极管(OLED)。基于B2PPQ作为蓝色发射器的OLED具有高亮度(8.0V时为19740 cdm〜(-2)),高效率(7.12 cdA〜(-1)和6.56%的外部量子效率(1175 cd m)时表现最佳〜(-2)),并由国际照明委员会(CIE)坐标(x = 0.15,y = 0.16)判断为具有出色的蓝色纯度。这些结果代表了迄今为止报道的来自纯荧光有机发射器的蓝色OLED的最佳效率。这些结果证明了寡喹啉作为开发高性能蓝色OLED的发射极和电子传输材料的潜力。

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