We report on the optical properties of Nd<sup>3+</sup>- and Tb<sup>3+</sup>-doped low-phonon-energy moisture-resistant host crystals, potassium lead bromide (KPb<sub>2</sub>Br<sub>5</sub>), and rubidium lead bromide (RbPb<sub>2</sub>Br<sub>5</sub>), including absorption, emission, and emission lifetime measurements as well as calculations of the multiphonon decay rate, Judd–Ofelt parameters, and radiative transition probabilities for relevant (laser) transitions in these crystals. The RE<sup>3+</sup>:MPb<sub>2</sub>Br<sub>5</sub> (M=Rb, K) crystal is a promising candidate for long-wavelength infrared applications because of the low phonon frequencies and other favorable features.
© 2004 Optical Society of America
Katja Rademaker, William F. Krupke, Ralph H. Page, Stephen A. Payne, Klaus Petermann, Guenter Huber, Alexander P. Yelisseyev, Ludmila I. Isaenko, Utpal N. Roy, Arnold Burger, Krishna C. Mandal, and Karel Nitsch, "Optical properties of Nd3+- and Tb3+-doped KPb2Br5 and RbPb2Br5 with low nonradiative decay," J. Opt. Soc. Am. B 21, 2117-2129 (2004)