1. Flexible QLED and OPV based on transparent polyimide substrate with rigid alicyclic asymmetric isomer
- Author
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Junli Li, Jiulin Shen, Guoli Tu, Jikang Liu, Xiangfu Liu, Zhonghuan Cao, Fu Li, Ke Ding, and Xiang Cai
- Subjects
chemistry.chemical_classification ,Electron mobility ,Materials science ,Annealing (metallurgy) ,02 engineering and technology ,General Chemistry ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Alicyclic compound ,Chemical engineering ,chemistry ,Quantum dot ,Electrode ,Polymer chemistry ,Materials Chemistry ,Electrical and Electronic Engineering ,0210 nano-technology ,Glass transition ,Polyimide - Abstract
A series of isomeric alicyclic-functionalized polyimide with chemical imidization and thermal imidization (CPI-x and TPI-x) were prepared from a rigid alicyclic-functionalized isomerism diamine, 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane (DAPI). The influences of incorporation of the isomeric rigid alicyclic structure onto the backbone of the polymers were systematically investigated in terms of optical, thermal, mechanical, dielectric and surface properties, respectively. Due to the moderate chemical imidization condition, CPI-x series retain higher glass transition temperature (Tg) in the range of 329–429 °C than the Tg of TPI-x (from 321.9 °C to 370.7 °C). Therefore, the CPI-1 film based 5-DAPI was chosen as the flexible substrate. MoO3 was chosen as the interface layer to improve the compatibility between PI substrate and the metal electrode. Then a ultra-thin layer of MoO3 (3 nm)/Au(2 nm)/Ag(4 nm) was utilized to be the transparent electrode. After annealing at 220 °C for 0.5 h, zinc oxide (ZnO) was deposited onto the electrode to maintain the superior electron mobility and improve the transparency of the electrode. Consequently, the flexible quantum dots light emitting diode (QLED) obtained a high luminance of 5230 (cd/m2) and EQE of 5.2%, meanwhile, a device performance of 4.36% was achieved in organic photovoltaic (OPV) devices.
- Published
- 2017