We have provided a comment to a very interesting paper on multicolour PA emission in sensitized YbPr-YbTm/Ho. This studies show
- A. Bednarkiewicz, M. Szalkowski, Photon avalanche in nanoparticles goes multicolour, News&Views, Nature Nanotechnology, (2022) .
- Liang, Y., Zhu, Z., Qiao, S. et al. Migrating photon avalanche in different emitters at the nanoscale enables 46th-order optical nonlinearity. Nat. Nanotechnol. (2022).