# photon upconversion

> process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than the excitation wavelength

**Wikidata**: [Q7187864](https://www.wikidata.org/wiki/Q7187864)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Photon_upconversion)  
**Source**: https://4ort.xyz/entity/photon-upconversion


## References

1. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)