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Perovskite Quantum Dots with Ultrahigh Solid-State Photoluminescence Quantum Efficiency, Superior Stability, and Uncompromised Electrical Conductivity
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-09-16 , DOI: 10.1021/acs.jpclett.1c02472
Jun Bo 1 , Xiaojuan Sun 1 , Peng Wan 1 , Dong Huang 2 , Xingtong Chen 1 , Mengyu Chen 1 , Rui Li 1 , Dongyang Shen 2 , Qinyi Li 2 , Wenlin Xia 2 , Zi Ye 1 , Yu Chen 2 , Song Chen 1
Affiliation  

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.

中文翻译:

钙钛矿量子点具有超高固态光致发光量子效率、卓越的稳定性和不折不扣的导电性

全无机钙钛矿量子点 (PQD) 可能适用于高性能显示技术,当兼具优异的发光性能、高稳定性和不折不扣的导电性时,正面临挑战。在这里,通过引入硫酸己胺并降低反应速率,我们设法优化了 CsPbBr 3的表面牺牲涂层量子点。结果,胶体 PQD 在溶液中显示出 95.8% 的光致发光量子效率 (PLQE),在固态薄膜中显示出高达 97.8% 的内部 PLQE。就稳定性而言,PQDs 不仅对极性溶剂表现出优异的耐受性,而且在 100°C 下连续加热 60 分钟后仍能保持 84% 以上的初始 PL 强度。更重要的是,在不影响导电性的情况下实现了卓越的稳定性。由这些 PQD 制成的发光二极管显示出 8.9 cd A –1的电流效率和出色的热稳定性。
更新日期:2021-09-23
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