Capping Ligand Engineering Enables Stable CsPbBr3 Perovskite Quantum Dots toward White-Light-Emitting Diodes

Xiaolin Zhu; Zhangcheng Pan; Tianyue Xu; Xiuwen Shao; Zhaoju Gao; Qingyu Xie; Yupeng Ying; Wei Pei; Hao Lin; Jia Wang; Xiaosheng Tang; Weiwei Chen; Yongfeng Liu

doi:10.1021/acs.inorgchem.3c01092

Capping Ligand Engineering Enables Stable CsPbBr₃ Perovskite Quantum Dots toward White-Light-Emitting Diodes

Inorg Chem. 2023 Jun 12;62(23):9190-9198. doi: 10.1021/acs.inorgchem.3c01092. Epub 2023 May 25.

Authors

Xiaolin Zhu¹, Zhangcheng Pan¹, Tianyue Xu¹, Xiuwen Shao¹, Zhaoju Gao¹, Qingyu Xie¹, Yupeng Ying¹, Wei Pei¹, Hao Lin², Jia Wang³, Xiaosheng Tang⁴, Weiwei Chen⁴, Yongfeng Liu¹

Affiliations

¹ College of Physical Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, P. R. China.
² Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macao SAR 999078, P. R. China.
³ Department of Physics, Umeå University, Umeå SE-90187, Sweden.
⁴ College of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chongqing 400065, People's Republic of China.

PMID: 37229601
DOI: 10.1021/acs.inorgchem.3c01092

Abstract

All-inorganic perovskite quantum dots (PeQDs) have sparked extensive research focus on white-light-emitting diodes (WLEDs), but stability and photoluminescence efficiency issues are still remain obstacles impeding their practical application. Here, we reported a facile one-step method to synthesize CsPbBr₃ PeQDs at room temperature using branched didodecyldimethylammonium fluoride (DDAF) and short-chain-length octanoic acid as capping ligands. The obtained CsPbBr₃ PeQDs have a near-unity photoluminescence quantum yield of 97% due to the effective passivation of DDAF. More importantly, they exhibit much improved stability against air, heat, and polar solvents, maintaining >70% of initial PL intensity. Making use of these excellent optoelectronic properties, WLEDs based on CsPbBr₃ PeQDs, CsPbBr_1.2I_1.8 PeQDs, and blue LEDs were fabricated, which show a color gamut of 122.7% of the National Television System Committee standard, a luminous efficacy of 17.1 lm/W, with a color temperature of 5890 K, and CIE coordinates of (0.32, 0.35). These results indicate that the CsPbBr₃ PeQDs have great practical potential in wide-color-gamut displays.