Synthesis-on-substrate of quantum dot solids

Yuanzhi Jiang, Changjiu Sun, Jian Xu, Saisai Li, Minghuan Cui, Xinliang Fu, Yuan Liu, Yaqi Liu, Haoyue Wan, Keyu Wei, Tong Zhou, Wei Zhang, Yingguo Yang, Jien Yang, Chaochao Qin, Shuyan Gao, Jun Pan, Yufang Liu, Sjoerd Hoogland, Edward H. Sargent (), Jun Chen () and Mingjian Yuan ()
Additional contact information
Yuanzhi Jiang: Nankai University
Changjiu Sun: Nankai University
Jian Xu: University of Toronto
Saisai Li: Nankai University
Minghuan Cui: Henan Normal University
Xinliang Fu: Nankai University
Yuan Liu: University of Toronto
Yaqi Liu: Nankai University
Haoyue Wan: University of Toronto
Keyu Wei: Nankai University
Tong Zhou: Nankai University
Wei Zhang: Nankai University
Yingguo Yang: Chinese Academy of Sciences
Jien Yang: Henan Normal University
Chaochao Qin: Henan Normal University
Shuyan Gao: Henan Normal University
Jun Pan: Zhejiang University of Technology
Yufang Liu: Henan Normal University
Sjoerd Hoogland: University of Toronto
Edward H. Sargent: University of Toronto
Jun Chen: Nankai University
Mingjian Yuan: Nankai University

Nature, 2022, vol. 612, issue 7941, 679-684

Abstract: Abstract Perovskite light-emitting diodes (PeLEDs) with an external quantum efficiency exceeding 20% have been achieved in both green and red wavelengths1–5; however, the performance of blue-emitting PeLEDs lags behind6,7. Ultrasmall CsPbBr3 quantum dots are promising candidates with which to realize efficient and stable blue PeLEDs, although it has proven challenging to synthesize a monodispersed population of ultrasmall CsPbBr3 quantum dots, and difficult to retain their solution-phase properties when casting into solid films8. Here we report the direct synthesis-on-substrate of films of suitably coupled, monodispersed, ultrasmall perovskite QDs. We develop ligand structures that enable control over the quantum dots’ size, monodispersity and coupling during film-based synthesis. A head group (the side with higher electrostatic potential) on the ligand provides steric hindrance that suppresses the formation of layered perovskites. The tail (the side with lower electrostatic potential) is modified using halide substitution to increase the surface binding affinity, constraining resulting grains to sizes within the quantum confinement regime. The approach achieves high monodispersity (full-width at half-maximum = 23 nm with emission centred at 478 nm) united with strong coupling. We report as a result blue PeLEDs with an external quantum efficiency of 18% at 480 nm and 10% at 465 nm, to our knowledge the highest reported among perovskite blue LEDs by a factor of 1.5 and 2, respectively6,7.

Date: 2022
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DOI: 10.1038/s41586-022-05486-3

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