期刊
DYES AND PIGMENTS
卷 198, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109967
关键词
TADF; Dendrimer; Cross-linkable; All-solution-processed; OLEDs
资金
- National Natural Science Foundation of China [21801216]
- Postdoctoral Science Foundation of China [1107040209]
- Funding for schoollevel research projects of Yancheng Institute of Technology [xjr2019014]
By designing and synthesizing new cross-linkable thermally activated delayed fluorescence (TADF) dendrimer molecules, a blue all-solution-processed organic light-emitting diode (OLED) was developed. The use of DVCz-3CzCN molecule was found to form stable and uniform thin films, effectively suppressing triplet exciton concentration quenching.
Based on the strategy of constructing a new cross-linkable thermally activated delayed fluorescence TADF dendrimer act as the emitter, the blue all-solution-processed organic light-emitting diodes (OLEDs) was developed. Here, two thermally cross-linkable TADF molecules, namely DV-3CzCN and DVCz-3CzCN, are designed and synthesized. Systematic studies demonstrate that the utilization of DVCz-3CzCN can form a stable and uniform thin film by the solution-process, but also effectively suppress the triplet excitons concentration quenching by the intermolecular interaction. Simultaneously, DVCz-3CzCN possesses the sufficient solvent resistance that can afford the subsequently deposition of electron transporting materials by orthogonal solvent. Consequently, the highly efficient blue all-solution-processed device based on DVCz-3CzCN realized a maximum current efficiency (CE), power efficiency (PE) and external quantum efficiency (EQE) of 7.1 cd A(-1), 4.5 lm W-1 and 6.8%, respectively, which is eight times higher in device efficiency than corresponding device with the unencapsulated DV-3CzCN.
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