Highly Stable Lead-Free Cs₃Bi_2–yEr_yBr₉ Fluorozirconate Perovskite Glasses with MIR Luminescence

Abstract

All-inorganic cesium lead halide perovskite quantum dots (QDs) have attracted much attention due to their outstanding photoelectric properties. However, the toxicity of Pb and the instability of perovskites are the key problems limiting the large-scale development of perovskites. Therefore, it is of great practical significance to replace lead with other nontoxic metal elements to achieve environmental sustainability, improved stability, and excellent photoelectric performance. At the same time, the research of perovskite mainly focuses on the visible region, but the mid-infrared region is rarely studied. Herein, mid-infrared (MIR) luminescent lead-free Cs3Bi2–y Er y Br9 perovskite fluoride glasses are obtained. The use of the relatively low-toxicity Bi element can solve the problem of toxicity. The optical and thermal stabilities of the Cs3Bi2–y Er y Br9 perovskite are greatly improved when Cs3Bi2–y Er y Br9 is implanted into a glass matrix. The upconversion and the mid-infrared luminescence increase with the local crystal field symmetry of Er3+ increasing. The vibrator intensity parameter Ω2 of the glass samples has an increasing trend with increasing Cs3Bi2–y Er y Br9 concentration. The maximum absorption and emission cross-sectional areas of 2.7 μm mid-infrared luminescence are 3.42 × 10–20 and 3.76 × 10–20 cm2, respectively. A large emission cross section means better laser gain. Therefore, the Cs3Bi2–y Er y Br9 perovskite glass is a potential mid-infrared laser gain material.

Broadband 3μm MIR emission from Lead-free perovskite fluorine composite glass and CO2 monitoring in H2 applications

“…The emission wavelength of CsPbX3(X=Br, I) phosphosilicate glass could be shifted from 500 nm to 700 nm by modifying the molar ratio of halide sources by Chen et al Due to the superior protective function of the glass matrix, the CsPbX3(X=Br, I) phosphosilicate glass also demonstrates outstanding increases in thermal stability, photostability, and water resistance [14]. Zhang et al used the conventional melt quenching method to introduce the rare earth cation Er 3+ into Cs3Bi2Br9 perovskite glass to obtain mid-infrared luminescence [15].…”

High‐Energy Ball Milling Synthesize All‐Inorganic Lead‐Free Green Emitting Cs3MnBr5 Crystals

“…In addition, there are many researches focus on lead-free metal halide perovskite nanocrystals such as CsGeBr 3 , Cs 2 AgBiX 6 , and Cs 2 SnI 6 , but those perovskite NCs are far inferior in luminescence efficiency, stability and monochromaticity comparing with all-inorganic lead halide perovskite QDs, which seriously affects the color purity and performance of LED. [4,[28][29][30][31] Thereby, we urgently need to find new lead-free phosphors with high quantum yield and narrow FWMH as an electron-hole recombination layer for high-performance LED devices.…”

Exploring CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals in Amorphous Oxide Glasses: Innovations in Fabrication and Applications

“…While in this review we have summarized the recent progress in fabrication and properties of CsPbX 3 PeNC@glass composites, it should be noted that glass matrices can also embrace other fully inorganic compositions of PeNCs, such as Pb‐free perovskite structures. [ 25,58–62 ] One of those is related to the manganese halide PeNCs embedded inside borate glasses, [ 61 ] which provided red‐emissive composites with PLQE of 41.8% and negligible reabsorption for stable X‐ray scintillation performance and high‐resolution X‐ray imaging. In another study, Zhang's group fabricated lead‐free double perovskites of Cs 2 AgIn 1‐x Er x Cl 6 in amorphous fluoride glass, which showed strong and stable mid‐infrared luminescent located ≈2750 nm, suitable for monitoring of carbon dioxide in hydrogen gas.…”