Solution-processable iridium complexes for efficient orange-red and white organic light-emitting diodes†
Solution-processable iridium complexes for efficient orange-red and white organic light-emitting diodes†
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DOI：
10.1039/c1jm13846d
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发表时间：
2012
影响因子：
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通讯作者：
Renjie Wang;Di Liu;Run Zhang;Lijun Deng;Jiuyan Li
中科院分区：
文献类型：
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作者：
Renjie Wang;Di Liu;Run Zhang;Lijun Deng;Jiuyan Li
以2-苯基苯并噻唑衍生物为主要配体合成了两种均配型和杂配型的环化铱配合物1和2，并表征为高效的橙红色荧光体。在苯并噻唑环的6-位引入三芳胺作为重要的取代基来调节这些配合物的光电性质。与大多数小分子铱配合物不同，1和2是溶液可加工的，并且它们的纯净膜可以通过旋涂方法获得。此外，在低掺杂水平下，通过溶液法成功地制备了它们在小分子基质4，4 ′-N，N′-二咔唑联苯（CBP）中的均匀分散膜。通过溶液处理含有1和2作为CBP基质中的掺杂发射极的发光层来制备有机发光二极管（OLED）。通过使用5wt%2作为掺杂剂实现了有效的橙红色电致发光，最大效率为14.49 cd A-1（7.38 lm W-1和8.73%），国际照明委员会（CIE）坐标为（0.60，0.40），这是迄今为止部分溶液处理的红色和橙红色OLED的最高发光效率。此外，通过旋涂发光层，用这些橙红色磷光体和传统的蓝色发光体实现了双元素白色OLED。实现了8.97 cd A-1的最大亮度效率和（0.33，0.35）的CIE。
Two homoleptic and heteroleptic cyclometalated iridium complexes containing the 2-phenylbenzothiozole derivative as the main ligand, 1 and 2, have been synthesized and characterized as efficient orange-red phosphors. Triarylamine was introduced as an important substituent into the 6-position of the benzothiazole ring to tune the photonic and electronic properties of these complexes. Different from most of small molecular iridium complexes, 1 and 2 are solution-processable and their neat films can be obtained by a spin-coating method. Furthermore, their homogeneously dispersed films in a small molecular matrix, 4,4′-N,N′-dicarbazolebiphenyl (CBP), were successfully prepared by solution method even with low doping levels. Organic light-emitting diodes (OLEDs) were fabricated by solution processing the emitting layer containing 1 and 2 as doped emitters in the CBP host. Efficient orange-red electroluminescence by using 5 wt% 2 as the dopant was realized with a maximum efficiency of 14.49 cd A−1 (7.38 lm W−1 and 8.73%) and Commission Internationale de l'Eclairage (CIE) coordinates of (0.60, 0.40), which are among the highest luminance efficiency ever reported for partially solution-processed red and orange-red OLEDs so far. In addition, two-element white OLEDs were achieved with these orange-red phosphors and the traditional blue emitter by spin coating the emission layer. A maximum luminance efficiency of 8.97 cd A−1 and CIE of (0.33, 0.35) were realized.