Scientists in Taiwan discovered that placing gold nanoparticles in plants made them glow, which could turn them into an effective form of nighttime illumination:
By implanting the gold nanoparticles into the leaves of the Bacopa caroliniana plants, the scientists were able to induce the chlorophyll in the leaves to produce a red emission. Under a high wavelength of ultraviolet light, the gold nanoparticles were able to produce a blue-violet fluorescence to trigger a red emission in the surrounding chlorophyll.[...]
‘In the future, bio-LED could be used to make roadside trees luminescent at night. This will save energy and absorb CO2 as the bio-LED luminescence will cause the chloroplast to conduct photosynthesis,’ Dr. Yen-Hsun Su said in an interview with Chemistry World.