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This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (November 2012) (Learn how and when to remove this message) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Cooperative luminescence and cooperative absorption" – news · newspapers · books · scholar · JSTOR (August 2018) (Learn how and when to remove this message) (Learn how and when to remove this message)

Cooperative luminescence is the radiative process in which two excited ions simultaneously make downward transition to emit one photon with the sum of their excitation energies. The inverse process is cooperative absorption, in which a photon can be absorbed by a coupled pair of two ions, making them excited simultaneously.

References

• Nakazawa, Eiichiro; Shionoya, Shigeo (1970-12-21). "Cooperative Luminescence in YbPO4". Physical Review Letters. 25 (25). American Physical Society (APS): 1710–1712. Bibcode:1970PhRvL..25.1710N. doi:10.1103/physrevlett.25.1710. ISSN 0031-9007.
• Dexter, D. L. (1962-06-15). "Cooperative Optical Absorption in Solids". Physical Review. 126 (6). American Physical Society (APS): 1962–1967. Bibcode:1962PhRv..126.1962D. doi:10.1103/physrev.126.1962. ISSN 0031-899X.

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