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Ligand & band gap engineering: tailoring the protocol synthesis for achieving high-quality CsPbI3 quantum dots
Ehsan Hassanabadi1, Masoud Latifi, Andrés F Gualdrón-Reyes
1Institute of Advanced Materials (INAM), University Jaume I, Avenida de Vicent Sos Baynat, s/n, 12071 Castellón de la Plana, Castellón, Spain. sero@uji.es.
Nanoscale
|July 1, 2020
Summary
Ultra-stable cesium lead iodide perovskite quantum dots (QDs) were synthesized for over 15 months. Optimized synthesis conditions yielded high photoluminescence quantum yield (PLQY) for advanced optoelectronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Dot Synthesis
Background:
- Hot-injection is the primary method for synthesizing perovskite quantum dots (QDs).
- The synthesis chemistry of perovskite QDs requires further investigation for improved stability and performance.
- Cesium lead iodide (CsPbI3) QDs are of significant interest for optoelectronic devices.
Purpose of the Study:
- To synthesize ultra-high stable CsPbI3 quantum dots (QDs).
- To investigate the impact of synthesis temperature and capping ligand concentration on QD properties.
- To enhance photophysical properties and device performance of CsPbI3 QDs.
Main Methods:
- Controlled hot-injection synthesis of CsPbI3 QDs.
- Systematic variation of synthesis temperature and capping ligand concentration.
- Characterization of QD stability, photoluminescence quantum yield (PLQY), and device performance.
Main Results:
- Achieved CsPbI3 QD stability exceeding 15 months.
- Maximized PLQY to 93% at 185 °C synthesis temperature.
- Demonstrated deep red LEDs with External Quantum Efficiency (EQE) > 6% using optimized CsPbI3 QDs.
Conclusions:
- Optimized synthesis parameters (temperature, ligand concentration) lead to highly stable CsPbI3 QDs.
- Efficient surface passivation achieved through controlled synthesis enhances photophysical properties.
- Developed CsPbI3 QDs meet and exceed Rec. 2020 standards for red color emission in LEDs.
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