Rare-Earth Borate Polymorphs

Rare-Earth Borate Polymorphs

Author: Andrei Dragan

Meta-stable rare-earth or bismuth borates, key components of solid-state laser sources, were originally obtained under high-temperature and high-pressure conditions. Progress toward their synthesis has been made in 2012 [1],  when δ-Bi1-xREB3O6 (RE = La, Ce, Pr, Nd) was formed at ambient pressure. These borates showed a strong second harmonic generation, which means that they could effectively expand the laser frequency range.

Rihong Cong, Chongqing University, China, and colleagues have shown that β-Gd1-xBixB3O6 also easily forms at ambient pressure. The thermal stability of these borates could be manipulated by mutual doping between rare earth and bismuth ions, which the team found via a systematic photoluminescence study on the high-pressure phase.

This study leads to better understanding of the synthetic chemistry of borates. In addtion, it helps to explore the optical performance of high-pressure polymorphs of borates. The rational co-doping of β-Gd1-xBixB3O6 with Tb3+ and Eu3+ creates color-tunable and bright emissions.


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