Perovskite Quantum Dots with Ultrahigh Solid-State Photoluminescence Quantum Efficiency, Superior Stability, and Uncompromised Electrical Conductivity
- 16 September 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 12 (37), 9115-9123
- https://doi.org/10.1021/acs.jpclett.1c02472
Abstract
All-inorganic perovskite quantum dots (PQDs), potentially applicable to high-performance display technologies, are facing challenges when the superior luminescence properties with high stability and uncompromised electrical conductivity are combined. Here, by introducing hexylamine sulfate and reducing the reaction rate, we managed to optimize the surface sacrificial coating of CsPbBr3 QDs. As a result, the colloidal PQDs show a photoluminescence quantum efficiency (PLQE) of 95.8% in solution, and an internal PLQE as high as 97.8% in solid-state films. As far as stability is concerned, the PQDs not only show excellent resistance to polar solvent but also can retain over 84% of the initial PL intensity after continuous heating at 100 °C for 60 min. More importantly, the superior stability is achieved without compromising electrical conductivity. The light-emitting diodes made from these PQDs show a current efficiency of 8.9 cd A–1 with excellent thermal stability.Funding Information
- Natural Science Foundation of Jiangsu Province (BK20190098)
- Major Basic Research Project of the Natural Science Foundation of the Jiangsu Higher Education Institutions (19KJA550001)
- Shuangchuang Program of Jiangsu Province
- National Natural Science Foundation of China (61804102)
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province
- Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University
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