Capping Ligand Engineering Enables Stable CsPbBr3 Perovskite Quantum Dots toward White-Light-Emitting Diodes
Xiaolin Zhu1, Zhangcheng Pan1, Tianyue Xu1
1College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, P. R. China.
Inorganic Chemistry
|May 25, 2023
Summary
We developed a simple method to create stable, highly efficient perovskite quantum dots (PeQDs) for white-light-emitting diodes (WLEDs). These PeQDs offer improved performance for displays.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- All-inorganic perovskite quantum dots (PeQDs) are promising for white-light-emitting diodes (WLEDs).
- Practical application of PeQDs is hindered by poor stability and low photoluminescence efficiency.
Purpose of the Study:
- To develop a facile synthesis method for stable, high-efficiency CsPbBr3 PeQDs.
- To investigate the improved stability and photoluminescence properties of these PeQDs.
- To fabricate and evaluate WLEDs utilizing the synthesized PeQDs.
Main Methods:
- Synthesized CsPbBr3 PeQDs at room temperature using a one-step method.
- Employed branched didodecyldimethylammonium fluoride (DDAF) and octanoic acid as capping ligands.
- Fabricated WLEDs using CsPbBr3 PeQDs, CsPbBr1.2I1.8 PeQDs, and blue LEDs.
Main Results:
- Achieved near-unity photoluminescence quantum yield (97%) due to effective DDAF passivation.
- Demonstrated significantly improved stability against air, heat, and polar solvents (>70% PL intensity retention).
- Fabricated WLEDs exhibited a wide color gamut (122.7% NTSC), luminous efficacy of 17.1 lm/W, and a color temperature of 5890 K.
Conclusions:
- The developed CsPbBr3 PeQDs possess excellent optoelectronic properties and enhanced stability.
- These PeQDs show great potential for practical applications in wide-color-gamut displays and WLEDs.
