Fluorescence Concentric Triangles: A Case of Chemical Heterogeneity in WS2 Atomic Monolayer

• DOI: 10.1021/acs.nanolett.6b02111
• Publication Date: 2016-08-01T16:21:32Z
• Authors: Hongwei Liu; Junpeng Lu; Kenneth Ho; Zhenliang Hu; Zhiya Dang; Alexandra Carvalho; Hui Ru Tan; Eng Soon Tok; Chorng Haur Sow
• Keywords: Trion

We report a novel optical property in WS2 monolayer. The monolayer naturally exhibits beautiful in-plane periodical and lateral homojunctions by way of alternate dark bright band the fluorescence images these monolayers. interface between different species within sample is distinct sharp. This gives rise to intriguing concentric triangular patterns this special facilitated chemical heterogeneity. photoluminescence dominated emissions from trion biexciton while emission defect-bound exciton dominates at band. discovery such represents potentially new form optoelectronic or photonic functionality.