Highly Stable CsPbI3 Perovskite Quantum Dots Enabled by Single SiO2 Coating toward Down-Conversion Light-Emitting Diodes
Source abstract
Abstract
All-inorganic CsPbI3 perovskite quantum dots (PeQDs) have sparked widespread research due to their excellent optoelectronic properties and facile synthesis. However, attaining highly stable CsPbI3 perovskite quantum dots (PeQDs) against heat and polar solvents still remains a challenge and hinders any further practical application. Here, by exploiting (3-aminopropyl) triethoxysilane (APTES) as the sole silica (SiO2) precursor, we report a one-step in situ synthesis of single SiO2-coated CsPbI3 (SiO2-CsPbI3) PeQDs, namely that one SiO2 particle only contains one CsPbI3 PeQD particle. The obtained SiO2-CsPbI3 PeQDs are cubic in shape, have a more uniform size distribution, and possess narrow emission, with near unit photoluminescence quantum yields of up to 97.5%. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirm the formation of SiO2 through the hydrolysis of APTES on the CsPbI3 PeQDs surface. Furthermore, they have a significantly improved stability against storage, heat, and ethanol. By combining purple-emission GaN light-emitting diodes, the SiO2-CsPbI3 PeQDs were successfully employed as down-conversion emitters and exhibited considerable enhanced luminous performance and excellent stability, demonstrating their promising future in the practical application of solid-state lighting fields.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · Quantum Dots Synthesis And Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Microelectronics Industry Research Institute, College of Physical Science and Technology, Yangzhou University, Yangzhou 225002, China
Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR, China
Department of Physics, Umea University, 90187 Umea, Sweden
Funding
Outstanding Doctor Program of Yangzhou City ‘Lv Yang Jin Feng’ · Innovation Technology Platform Project Jointly Built by Yangzhou City and Yangzhou University, China · Jiangsu Students’ Innovation and Entrepreneurship Training Program · J. C. Kempes Minnes Stipendiefond · Bertil & Britt Svenssons stiftelse för belysningsteknik, the Swedish Foundation for International Cooperation in Research, Higher Education via an Initiation Grant for Internationalization
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