Multifunctional Bismuth‐Doped Nanoporous Silica Glass: From Blue‐Green, Orange, Red, and White Light Sources to Ultra‐Broadband Infrared Amplifiers

TLDR

Ultra‑broadband luminescent sources spanning a wide wavelength range are sought after for photonics, medical treatment, and precision measurement, yet existing rare‑earth and transition‑metal doped materials have not achieved this goal. The study proposes a facile method to create an ultra‑broadband light source by stabilizing bismuth centers in nanoporous silica glass. The method stabilizes multiple bismuth oxidation states (Bi⁺, Bi²⁺, Bi³⁺) within the porous silica matrix, enabling broadband emission. The resulting transparent materials emit across blue‑green, orange, red, white, and near‑infrared wavelengths, covering the RGB primary colors and telecommunications windows.

Abstract

Abstract Ultra‐broadband luminescent sources that emit light over an extremely wide wavelength range are of great interest in the fields of photonics, medical treatment, and precision measurement. Extensive research has been conducted on materials doped with rare‐earth and transition‐metal ions, but the goal of fabricating an ultra‐broadband emitter has not been attained. We present a facile method to realize this kind of novel light source by stabilizing “active” centers (bismuth) in a “tolerant” host (nanoporous silica glass). The obtained highly transparent materials, in which, unusually, multiple bismuth centers (Bi + , Bi 2+ , and Bi 3+ ) can be stabilized, emit in an ultra‐broadband wavelength range from blue‐green, orange, red, and white to the near‐infrared region. This tunable luminescence covers the spectral range of the traditional three primary colors (RGB) and also the telecommunications windows.