TY - JOUR
T1 - Synergistic Ligand Pair Exchange Strategy in Perovskite Quantum Dots to Enhance Photoelectric Properties and Stability
AU - Li, Xuyang
AU - Lv, Qihang
AU - Xu, Zitong
AU - Wang, Weijun
AU - Tang, Zhixin
AU - Shen, Xia
AU - Shan, Zhaohui
AU - Miao, Yanqin
AU - Ho, Johnny C.
AU - Guo, Pengfei
N1 - Publisher Copyright:
© 2025 Wiley-VCH GmbH.
PY - 2025/12/12
Y1 - 2025/12/12
N2 - Perovskite quantum dots (PeQDs) have attracted significant attention as research materials due to their adjustable bandgaps, high photoluminescence quantum yield, and excellent color purity. However, conventional surface ligands often suffer from weak coordination capacity and low conductivity, adversely affecting the stability and photoelectric properties of PeQDs. In this study, a synergistic ligand pair exchange strategy is introduced to enhance the properties of pristine CsPbBr3 PeQDs. By sequentially incorporating α-methyl-4-fluoro-benzylamine and p-toluenesulfonic acid, the original OA/OAm ligand pair is successfully replaced, efficiently passivating the A- and X-site vacancies. The modified CsPbBr3 PeQDs demonstrate notable improvements in photoluminescence intensity and stability when exposed to UV light, high temperatures, and water immersion. Furthermore, this treatment approach is applicable to CsPbI3 and mixed-halogen PeQDs. A high-performance photodetector fabricated from these treated CsPbBr3 QDs showcases a responsivity of 3.9 mA W−1 and a detectivity of 2.0 × 1010 Jones, representing a 6-fold enhancement over untreated counterparts. Also, devices based on treated CsPbBr3 QDs show potential in optical communications, effectively illustrating encryption and decryption processes. This synergetic ligand pair exchange strategy offers a promising avenue for the broader application of PeQDs in optoelectronics devices and circuits.
AB - Perovskite quantum dots (PeQDs) have attracted significant attention as research materials due to their adjustable bandgaps, high photoluminescence quantum yield, and excellent color purity. However, conventional surface ligands often suffer from weak coordination capacity and low conductivity, adversely affecting the stability and photoelectric properties of PeQDs. In this study, a synergistic ligand pair exchange strategy is introduced to enhance the properties of pristine CsPbBr3 PeQDs. By sequentially incorporating α-methyl-4-fluoro-benzylamine and p-toluenesulfonic acid, the original OA/OAm ligand pair is successfully replaced, efficiently passivating the A- and X-site vacancies. The modified CsPbBr3 PeQDs demonstrate notable improvements in photoluminescence intensity and stability when exposed to UV light, high temperatures, and water immersion. Furthermore, this treatment approach is applicable to CsPbI3 and mixed-halogen PeQDs. A high-performance photodetector fabricated from these treated CsPbBr3 QDs showcases a responsivity of 3.9 mA W−1 and a detectivity of 2.0 × 1010 Jones, representing a 6-fold enhancement over untreated counterparts. Also, devices based on treated CsPbBr3 QDs show potential in optical communications, effectively illustrating encryption and decryption processes. This synergetic ligand pair exchange strategy offers a promising avenue for the broader application of PeQDs in optoelectronics devices and circuits.
KW - encrypted communication
KW - ligand exchange
KW - perovskite quantum dots
KW - stability
UR - https://www.scopus.com/pages/publications/105019229159
U2 - 10.1002/adom.202502489
DO - 10.1002/adom.202502489
M3 - 文章
AN - SCOPUS:105019229159
SN - 2195-1071
VL - 13
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 35
M1 - e02489
ER -