New strategy to enhance the broadband near‐infrared emission of bismuth‐doped laser glasses

Abstract

Bismuth‐doped glasses and fibers with broadband near‐infrared (NIR) emission have garnered much attention on account of their potential applications in new fiber lasers and broadband amplifiers. Yet the realization of high gain from Bi‐doped fibers and highly efficient NIR emission from Bi‐doped glasses are still a stubborn puzzle. The enhancement of Bi NIR emission is normally based on modifying the glass composition and topology, which will change the structure of the glass over a wide range and alter the thermal or mechanical properties of the glass simultaneously, making it more complicated for the designing and fabricating of Bi fibers with good performance. Here, we find that a trace addition of Si3N4 can efficiently enhance the Bi NIR emission without changing the glass structure significantly, right followed by spectral and structural analysis. 27Al NMR measurement reveals that the short‐ to medium‐range order of this glass is unchanged. The EPMA measurement confirms the homogeneity of fabricated glass. The great enhancement and red‐shift under blue light excitation may originate from the conversion of Bi active centers to low valence. Our results indicate that the trace addition of nitride could be a facile and maneuverable way to control the valence of active ions in glasses, which may contribute to improving the performance of photonic glasses.

Enhanced NIR photoemission from Bi‐doped aluminoborate glasses via topological tailoring of glass structure

“…As revealed in Figure B, the excitation spectra obtained by monitoring the emission wavelength at 1135 nm of glass samples present three typical excitation bands centered at 300, 470, and 700 nm . The excitation bands show a clear red‐shift as increasing GeO 2 concentration, which is consistent with the variation in absorption and emission spectra under the excitation of 466 nm.…”

“…While the emission spectra present minimal widening upon the excitation of 326 and 712 nm, which can be more clearly observed in the corresponding normalized emission spectra (Figure B,D). This can be explained that the 326 and 712 nm light are corresponding to the excitation of Bi + , while 466 nm can be the excitation light of both Bi + and Bi 0 …”

Luminescence and electrical properties of Eu‐modified Bi0.5Na0.5TiO3 multifunctional ceramics

“…In addition, bismuth‐doped or ‐based materials present unique photoluminescence features, because Bi 3+ can function as both an activator and a sensitizer. Typically, Bi‐doped materials can be developed as phosphors to radiate from UV to IR region . Therefore, in this paper, we have studied Eu 3+ ‐doped BNT ceramic in order to improve its electrical properties and achieve excellent luminescence properties …”

“…Typically, Bi-doped materials can be developed as phosphors to radiate from UV to IR region. [22][23][24][25] Therefore, in this paper, we have studied Eu 3+ -doped BNT ceramic in order to improve its electrical properties and achieve excellent luminescence properties. 17,[26][27][28][29][30][31] In this paper, ceramics containing different amounts of Eu 3+ ions were developed by the solid-state reaction method.…”

Ultrabroad Photoemission from an Amorphous Solid by Topochemical Reduction

“…This motivates us to construct a local reducing atmosphere around Bi . Meanwhile, glass melt with large viscosity, acting as shield from air, could prevent the oxidation of Bi active centers and preserves the chemical reactions inside glasses in air atmosphere . More importantly, the physical and thermal properties of glasses could remain unchanged, favoring the fabrication of Bi fibers in the future.…”