期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 19, 页码 16351-16359出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b00615
关键词
quantum dots; cross-linkable; hole transport material; air-stable; inkjet printing
资金
- Science Foundation of Two Sides of Strait [U1605244]
- National Key R&D Program of China [2016YFB0401500, 2016YFB0401600]
- National Natural Science Foundation of China (NSFC) [21372714, 21402233]
- Youth Innovation Promotion Association CAS [2013206]
- Natural Science Foundation of Jiangsu Province [BK20140387]
- Project on the Integration of Industry, Education and Research of Jiangsu Province [BY2014066]
- Ph.D. Programs Foundation of Ministry of Education of China [2013201130004]
- Prospective Application Research Program of Suzhou City [SYG201631]
High-efficiency quantum dot light-emitting diodes (QLEDs) were fabricated using inkjet printing with a novel cross-linkable hole transport material N,N'-(9,9'-spirobi[fluorene]-2,7-diylbis[4,1-phenylene])bis(N-phenyl-4'-vinyl-[1,1' -biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability, and the highest occupied molecular orbital (HOMO) level of -5.54 eV. The inkjet-printed SDTF film is very smooth and uniform, with roughness as low as 0.37 nm, which is comparable with that of the spin-coated film (0.28 nm). The SDTF films stayed stable without any pinhole or grain even after 2 months in air. All-solution-processed QLEDs were fabricated; the maximum external quantum efficiency of 5.54% was achieved with the inkjet-printed SDTF in air, which is comparable to that of the spin-coated SDTF in a glove box (5.33%). Electrical stabilities of both spin-coated and inkjet-printed SDTF at the device level were also investigated and both showed a similar lifetime. The study demonstrated that SDTF is very promising as a printable hole transport material for making QLEDs using inkjet printing.
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