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*, Mingjian Yuan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)679-684
Number of pages6
Issue number7941
StatePublished - Dec 22 2022

ASJC Scopus subject areas

  • General


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