Ultrasmall black phosphorus quantum dots (BPQDs) with an average size of 2.1 ± 0.9 nm are synthesized by using a solvothermal method in a N ‐methyl‐2‐pyrrolidone solution. Verified by femto‐second laser Z‐scan measurement, BPQDs exhibit excellent nonlinear optical response with a modulation depth of...
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