期刊
ADVANCED OPTICAL MATERIALS
卷 10, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200935
关键词
blue quantum dot light-emitting diode; crosslinkable; hole transport layer; inkjet printing; intertwined
资金
- National Key Research and Development Program of China [2018YFE0125500, 2021YFE0105900]
- National Natural Science Foundation Project for Young Researcher [12005038]
- Research Fund for International Young Scientists [62050410350]
- National Natural Science Foundation Project of China [62175028, 51879042, 61674029]
- Program 111_2.0 in China [BP0719013]
- Leading Technology of Jiangsu Basic Research Plan [BK20192003]
- China Postdoctoral Science Foundation [2020M681726]
- Natural Science Foundation of Jiangsu Province [BK20210125]
In this study, a novel crosslinkable polymer FLTA-V was designed and synthesized, and a blended film with TFB was employed as an effective hole transport layer (HTL) for QLED. The crosslinked HTL showed excellent solvent resistance and formed a robust network structure, leading to enhanced charge transportation efficiency. The increased surface energy of the blended HTL also improved the electrical contact and reduced the leakage current of the device. The fabricated blended HTL-based QLED exhibited a remarkable enhancement of external quantum efficiency (EQE).
A novel crosslinkable 4,4 '-(9,9-dimethyl-9H-fluorene-2,7-diyl)bis(N-phenyl-N-(4-vinylphenyl)aniline) (FLTA-V) based on TFB repeat unit is designed and synthesized. A blended film with optimized 2:1 weight ratio of TFB and FLTA-V is employed to act as the effective hole transport layer (HTL) for quantum dot light-emitting diode (QLED). The resulted HTL is crosslinked and exhibits excellent solvent-resistant property without any initiators. It also forms a robust network structure and the TFB molecules are intertwined and imprisoned in the network. The HTL then becomes denser, which enhances both intermolecular interactions and pi-pi stacking to further promote efficient charge transportation. Moreover, the closeness of highest occupied molecular orbital levels between TFB (-5.4 eV) and FLTA-V (-5.6 eV) is beneficial for hole injection from HTL to QD layer. The increased surface energy of blended HTL ensures better electrical contact between HTL and QDs, which reduces the leakage current of the device. The combination of these favorable factors has led to the fabricated blue QLED showing a remarkable enhancement of external quantum efficiency (EQE) from 7.23% for the control TFB-based device to 10.20% for blended HTL-based device. In addition, a maximum of 6.82% of EQE for inkjet-printed blue QLED has been achieved, which is the best-reported high-efficiency inkjet-printed blue QLED to date.
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