[Tu-A2-B] Optical properties in 2D materials

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[Tu-A2-B-02] Light upconversion via resonant exciton-exciton annihilation in few-layer transition metal dichalcogenides

〇Shao-Yu Chen^1,2,3, Yi-Hsun Chen³, Ping-Yuan Lo², Shun-Jen Cheng² (1. National Taiwan University (Taiwan), 2. National Yang Ming Chiao Tung University (Taiwan), 3. Monash University (Australia))

We discover efficient light upconversion in few-layer 2D semiconductors where pairs of hidden dark excitons combine to emit higher-energy light. This tunable process spanning green to ultraviolet could boost future optoelectronic energy technologies and photocatalysis through novel exciton interactions.