Wydział Chemii

Weiwei Li

Jimeng Cheng

Guoying Zhao

Wei Chen

Hu Lili

Małgorzata Guzik

Georges Boulon

2014

Optics Express

22

8831-8842

10.1364/OE.22.008831

Naukowa

Angielski

Artykuł

60Bi₂O₃-20B₂O₃-10SiO₂-10Ga₂O₃ glasses doped with 1-9 mol% Yb₂O₃ were prepared and investigated mainly on their violet-green excitation for the typical NIR emission of Yb³⁺, generally excited in the NIR. Two violet excitation bands at 365 nm and 405 nm are related to Yb²⁺ and Bi³⁺. 465 nm excitation band and 480 nm absorption band in the blue-green are assigned to Bi⁰ metal nanoparticles/grains. Yb-content-dependence of the excitation and absorption means that Bi⁰ is the reduced product of Bi³⁺, but greatly competed by the redox reaction of Yb²⁺↔Yb³⁺. It is proved that the violet-green excitations result in the NIR emission of Yb³⁺. On the energy transfer, the virtual level of Yb³⁺-Yb³⁺ as well as Bi⁰ dimers probably plays an important role. An effective and controllable way is suggested to achieve nano-optical applications by Bi⁰ metal nanoparticles/grains and Yb³⁺.

CC-BY

http://dx.doi.org/10.1364/OE.22.008831