Almost completely dedoped electrochemically deposited luminescent films exhibiting excellent LED performance
Almost completely dedoped electrochemically deposited luminescent films exhibiting excellent LED performance
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几乎完全去掺杂的电化学沉积发光薄膜表现出优异的 LED 性能
DOI：
10.1016/j.electacta.2009.07.023
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发表时间：
2009-11-30
影响因子：
6.6
通讯作者：
Ma, Yuguang
中科院分区：
文献类型：
--
作者：
Gu, Cheng;Tang, Shi;Ma, Yuguang
提出了一种新型前驱体（外周咔唑取代9,9′-螺比芴（TCPC））电化学沉积（ED）制备高效发光薄膜和器件的改进方法。电化学沉积通常会在膜内留下残留的带电离子。这些物质会对OLED应用中的薄膜性能产生负面影响。通过控制氧化电位和还原电位、使用含有不同反阴离子的电解质以及用溶剂洗涤，可以减少薄膜中残余带电物质的数量。优化后的ED工艺显著降低了掺杂水平；在ED薄膜中高达0.07%。在扫描电位0.85 ~ -0.8 V范围内，以TBAAsF(6)为支撑电解质，用乙腈和CH2Cl2 （V/V = 2/3）混合溶剂洗涤制备的薄膜具有优异的器件性能。电化学沉积制备的发光器件在CIE坐标下实现了深蓝色发射(x, y) =(0.16, 0.06)。单层器件的发光效率高达2.3 cdA(-1)；双层器件的发光效率为4.4 cdA（-1）。最后，解决了ED薄膜电致发光效率低的问题。2009爱思唯尔有限公司版权所有。
An improved method for electrochemical deposition (ED) of a novel precursor (peripheral carbazole substituted 9,9'-spirobifluorene (TCPC)) for fabricating highly efficient luminescent films and devices has been developed. Electrochemical deposition often leaves residual charged ion species within the film. These species can negatively impact the performance of these films in OLED applications. The amount of residual charged species in the films can be reduced by controlling the oxidation and reduction potentials, by using electrolytes with different counter anions, and by washing with solvents. An optimized ED process showed a significant decrease in the doping level; up to 0.07% in ED film. The films prepared under a scan potential range from 0.85 to -0.8 V, using TBAAsF(6) as the supporting electrolyte, and washed with solvent mixtures of acetonitrile and CH2Cl2 (V/V = 2/3) demonstrated excellent device performance. Light-emitting devices fabricated by electrochemical deposition achieved deep blue emission (x, y) = (0.16, 0.06) in CIE coordinates. High luminance efficiencies of 2.3 cdA(-1) were achieved for single-layer device; luminescence efficiencies of 4.4 cdA(-1) were achieved for a double-layer device. Finally, the problem that ED films usually exhibit low electroluminescent efficiency is solved. (C) 2009 Elsevier Ltd. All rights reserved.