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Highly Solvent Resistant Small-Molecule Hole-Transporting Materials for Efficient Perovskite Quantum Dot
Daqing Zhang1, Changting Wei2, Xiansheng Li2
1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Centre, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Novel benzimidazole-based small-molecule hole-transporting materials (HTMs) were synthesized for efficient perovskite quantum dot light-emitting diodes (Pe-QLEDs). HTM-X6 demonstrated superior solvent resistance and achieved a high external quantum efficiency of 14.1% in Pe-QLEDs.
Area of Science:
- Materials Science
- Organic Electronics
- Optoelectronics
Background:
- Perovskite quantum dot light-emitting diodes (Pe-QLEDs) offer wide color gamut and high saturation for displays.
- Hole-transporting materials (HTMs) are critical for Pe-QLED performance and stability.
- Small-molecule HTMs are understudied due to poor solvent resistance and low hole mobility.
Purpose of the Study:
- To design and synthesize novel small-molecule HTMs for improved Pe-QLEDs.
- To investigate the effect of molecular structure on solvent resistance and device performance.
- To develop efficient and stable Pe-QLEDs using benzimidazole-based HTMs.
Main Methods:
- Synthesis of three novel benzimidazole-based small-molecule HTMs (X4, X5, X6).
- Fabrication and characterization of CsPbBr3 Pe-QLEDs using the synthesized HTMs.
- Evaluation of device performance, including external quantum efficiency (EQE) and stability.
Main Results:
- HTM-X6 exhibited excellent solvent resistance due to optimized solubility and low surface energy.
- X6-based Pe-QLEDs achieved a maximum EQE of 14.1%, outperforming X4 (9.16%) and X5 (6.60%).
- Performance of X6-based devices was comparable to the PTAA reference (EQE ~ 15.8%).
Conclusions:
- Benzimidazole-based small-molecule HTMs can be effectively applied in Pe-QLEDs.
- Synergistic effects of low solubility and low surface energy enhance solvent resistance.
- This work provides a design strategy for high-performance, solvent-resistant HTMs for Pe-QLEDs and other optoelectronic devices.
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