Authors
Chen Li, Haoyang Li, Chao Yue Zhang, Boxuan Zhou, Xingxu Yan, Ranning Tang, Lezhi Yi, Yuxiao He, Ting-Jung Hsiao, Haiyan Wang, Yucheng Zhang, Yang Liu, Xiaoqing Pan, Yu Huang, Xiangfeng Duan
Published in
Journal of the American Chemical Society. Jul 12, 2026. Epub Jul 12, 2026.
Abstract
Colloidal two-dimensional semiconductors are promising for scalable optoelectronics, but their development has been fundamentally limited by defect-induced nonradiative recombination that suppresses exciton emission. In particular, sulfur vacancies in solution-processed MoS2 introduce charge doping and trap states that favor trion formation, preventing bright neutral exciton photoluminescence. Here we show that simple oxidative chemistry activates bright neutral exciton emission in colloidal MoS2 monolayers. Ultraviolet (UV) irradiation under ambient conditions enhances photoluminescence by over 2 orders of magnitude, accompanied by a pronounced blueshift and a ∼100-fold increase in exciton lifetime (0.07 to 6.14 ns), indicating a transition from trion-dominated to neutral exciton recombination. We identify UV-driven oxygen reduction as the key process that passivates sulfur vacancies and induces electron dedoping effect, thereby suppressing nonradiative decay pathways. This mechanism is general: a range of oxidants, including H2O2, (NH4)2S2O8, (NH4)2Ce(NO3)6, and NaIO4, rapidly activate emission, in some cases without UV irradiation. These findings establish a chemically tunable strategy for controlling excitonic emission in solution-dispersed MoS2, enabling scalable optoelectronic and photonic applications.
PMID:
42437532
Bibliographic data and abstract were imported from PubMed on 13 Jul 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 5
- Comments 0