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Highly efficient all solution-processed non-doped deep-blue electroluminescent devices from oligocarbazole-end-capped spirobifluorenes
Materials Chemistry Frontiers ( IF 7 ) Pub Date : 2020-09-01 , DOI: 10.1039/d0qm00531b
Pattarawadee Therdkatanyuphong 1, 2, 3, 4, 5 , Chokchai Kaiyasuan 1, 2, 3, 4, 5 , Pongsakorn Chasing 1, 2, 3, 4, 5 , Terdkait Kaewpuang 3, 4, 5, 6 , Thanyarat Chawanpunyawat 1, 2, 3, 4, 5 , Paweena Wongkaew 1, 2, 3, 4, 5 , Taweesak Sudyoadsuk 1, 2, 3, 4, 5 , Vinich Promarak 1, 2, 3, 4, 5
Affiliation  

A series of non-doped solution-processed deep-blue emitters namely, 2,7-CSBF, 5,9-CSBF, 2,7-CSF, 2,7-CSFX and 3,6-CSFX, were designed and synthesized by attaching the structurally hindered electron-donating oligocarbazole unit to various deep-blue fluorescent spirobifluorenes. 2,7-CSBF, 5,9-CSBF, 2,7-CSF and 2,7-CSFX having the oligocarbazole unit electronically conjugated link with their backbones showed strong deep-blue emission in the film state with good hole-transporting ability, high quality amorphous film forming capability via spin-coating process and thermal and electrochemical stable assets. As non-doped emissive layers, their double-layer all solution-processed OLEDs emitted a deep-blue color. The devices yielded excellent electroluminescence (EL) performance with low turn-on voltages (Von) and high maximum external quantum efficiencies (EQE) in the range of 2.8–3.4 V and 1.71–4.10%, respectively. Notably, 5,9-CSBF, owing solid-state fluorescence quantum yield as high as 85% and hole mobility of 1.30 × 10−7 cm2 V−1 s−1, delivered a brilliant EL performance of all solution-processed non-doped deep-blue OLED with CIE coordinates of (0.150, 0.091), Von of 3.4 V, EQE of 4.10% and luminance efficiency of 4.42 cd A−1, which is one of the best among all-solution-processed deep-blue OLEDs reported to date.

中文翻译:

由低聚咔唑端基螺双芴形成的高效全溶液处理的非掺杂深蓝色电致发光器件

设计并合成了一系列非掺杂溶液处理的深蓝色发射极,分别是2,7-CSBF5,9-CSBF2,7-CSF2,7-CSFX3,6-CSFX。将受阻的给电子低聚咔唑单元连接到各种深蓝色荧光螺二芴上。具有低碳咔唑单元电子共轭连接的2,7-CSBF5,9-CSBF2,7-CSF2,7-CSFX的骨架显示出深蓝色发射,具有良好的空穴传输能力,通过高质量的非晶膜形成能力旋涂工艺以及热和电化学稳定资产。作为非掺杂的发光层,它们的双层所有经过溶液处理的OLED发出深蓝色。该器件具有出色的电致发光(EL)性能,具有低的开启电压(V on)和较高的最大外部量子效率(EQE),分别在2.8–3.4 V和1.71–4.10%的范围内。值得注意的是,5,9-CSBF由于具有高达85%的固态荧光量子产率和1.30×10 -7 cm 2 V -1 s -1的空穴迁移率,在所有溶液处理的非-掺杂的深蓝色OLED,其CIE坐标为(0.150,0.091),V最高为3.4 V,EQE为4.10%,亮度效率为4.42 cd A -1,是迄今为止报道的所有溶液处理的深蓝色OLED中最好的之一。
更新日期:2020-10-02
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