Cooperative Luminescence in YbP<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>

Eiichiro Nakazawa; Shigeo Shionoya

doi:10.1103/PhysRevLett.25.1710

Cooperative Luminescence in YbP $O_{4}$

Eiichiro Nakazawa and Shigeo Shionoya

Phys. Rev. Lett. 25, 1710 – Published 21 December 1970

Abstract

YbP $O_{4}$ was found to show weak green (497 nm) luminescence when excited by infrared (1 μm) light. It is concluded, on the basis of measurements of excitation intensity dependence and decay time, that this luminescence is due to the emission of a photon by a pair of excited ${Yb}^{3 +}$ ions in cooperation.