Solution processable red iridium dendrimers containing oligocarbazole dendrons for efficient nondoped and doped phosphorescent OLEDs
Solution processable red iridium dendrimers containing oligocarbazole dendrons for efficient nondoped and doped phosphorescent OLEDs
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含有低聚咔唑树枝的可溶液加工的红色铱树枝状聚合物，用于高效的非掺杂和掺杂磷光 OLED
DOI：
10.1039/c7tc03374e
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发表时间：
2017
影响因子：
6.4
通讯作者：
Wang Lixiang
中科院分区：
文献类型：
--
作者：
Zhao Lei;Wang Shumeng;Lv Jianhong;Ding Junqiao;Wang Lixiang
溶液可加工的红外线树枝状大分子R-D_1、R-D_2和R-D_3是以喹啉类均聚物为核心，以低聚咔唑为树枝状分子，通过后树枝化过程设计并成功合成的。从R-D_1到R-D_3，随着树枝生成的增加，由于外部树枝的包裹，分子间相互作用和固态发光猝灭被有效地阻止。结果表明，第三代树枝状大分子R-D3获得了最佳的非掺杂器件性能，EQE为10.5%(9.2cd A−1，7.0lm W−1)，CIE坐标为(0.67，0.33)。此外，R-D3掺杂器件在5-30wt%的掺杂浓度范围内表现出较宽的掺杂浓度窗口，当掺杂质量分数为10wt%左右时，器件的EQE最高可达18.3%(25.7cd A−1，33.0lm W−1)。这一结果可以与真空沉积的小分子红色荧光粉竞争，代表着溶液可加工的树枝状红色发光磷光材料的重要进展。
Solution processable red Ir dendrimers named R-D1, R-D2 and R-D3, which contain a quinoline-based homoleptic complex as the core and oligocarbazole as the dendron, have been facilely and successfully designed and synthesized via a post-dendronization procedure. With the increasing dendron generation from R-D1 to R-D3, the intermolecular interactions and luminescence quenching in solid states are found to be effectively prevented because of encapsulation from the outer dendrons. As a result, the third-generation dendrimer R-D3 achieves the best nondoped device performance, revealing a promising EQE of 10.5% (9.2 cd A−1, 7.0 lm W−1) with CIE coordinates of (0.67, 0.33). Furthermore, the doped devices of R-D3 show a wide doping concentration window in the range of 5–30 wt%, and a maximum EQE as high as 18.3% (25.7 cd A−1, 33.0 lm W−1) is realized at about a 10 wt% doping content. The results can compete well with vacuum-deposited small molecular red phosphors, representing important progress on solution processable phosphorescent dendrimers with red emission.