Semiconductor Quantum Dots‐Embedded Inorganic Glasses: Fabrication, Luminescent Properties, and Potential Applications

Abstract

of the glass, which can provide a stable environment for QDs. Besides, some new glasses, such as phosphate, germanate, and gallate glasses, are made by replacing Si by P, Ge, and Ga at a slight expense of stability for better transmittance at specific wavelength. Embedding QDs into inorganic glass can secure chemical stability, thermal stability, and mechanical stability, thus providing access to device manufacturing and endurable operation. [15][16][17][18] So far, IIB-VIA, IVB-VIA, and halide perovskite QDs have been successfully incorporated into glass by conventional melt-quenching and subsequent heat-treatment method and their optical properties have been extensively investigated. [18][19][20] Taking advantage of the stability, the applications of QDs-embedded glasses on nonlinear optical devices, [21,22] emitting devices, [15,23,24] and signal amplification in the fiber-optic communication system [3,25] have been explored. Recently, with the outstanding performance of halide perovskite materials in optoelectronic field, the perovskite NCs-doped glasses become a new research hotspot, especially for the applied research on white LED (wLED). For instance, wLED with a luminous efficiency of 50-60 lm W −1 and external efficiency of 20-25% was obtained with perovskite NCs-embedded glass slices as light converters. [24] Particularly, green light-emitting device made by CsPbBr 3 nano crystals (NCs)-embedded glass can realize a luminous efficiency of 118 lm W −1 and an external quantum efficiency of 28.14%. [24] Meanwhile, the luminescence intensity of CsPbBr 3 NCsembedded glass can be maintained above 90% when stored in water for a week or experienced a heating/cooling cycle at 100 °C. [17] QDs-embedded glasses have been studied for several decades. Although there are several review papers for a specific topic such as PbS QDs-doped glasses [26] and QDs-doped glasses for fibers, [27] to our best knowledge, no systematic overview has been made in QDs-embedded inorganic glasses until now. Here, we review the fabrication, luminescent properties, and potential application of QDs-embedded inorganic glasses. We first summarize the preparation methods and growth kinetics of QDs in glasses; we then review the optical properties and application explorations of IIB-VIA, IVB-VIA, and halide perovskite QDs-embedded glasses. Last we propose research directions to overcome the major challenges associated with these glasses for ultimate applications. Quantum dots (QDs)-embedded inorganic glasses combine the outstanding luminescent properties of QDs with the chemical, mechanical, and thermal stability of glasses, overcoming the instability bottleneck of QDs and facilitating their wide and endurable applications such as nonlinear optical devices, light emission, and signal amplification in the fiber-optic communication system. Typical QDs incorporated into glasses include IIB-VIA (e.g., ZnO, CdSe), IVB-VIA (e.g., PbS), and halide perovskite (CsPbBr 3 , et al.) QDs. Here, the preparation methods and growth kinetics of QDs in glasses ...

Two‐Step Anti‐Stokes Photoluminescence of CsPbX3 Nanocrystals

“…Tunable and highly efficient PL has been achieved in CsPbX 3 NCs doped glasses. [ 38–41 ] Cationic doping (Mn 2+ , Eu 3+ , etc.) into CsPbX 3 NCs in glasses have been realized to reduce the toxic load and generate dual‐band PL.…”

Ultrafast Laser Inducing Continuous Periodic Crystallization in the Glass Activated via Laser‐Prepared Crystallite‐Seeds

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In particular, ultrafast laser direct writing based glasscrystal optics has been widely reported to realize 3D nonlinear photonic crystals, [6,7] second harmonic generation, [8,9] optical waveguides, [10,11] and perovskite quantum dots in the glass. [12,13] However, the reported ultrafast laser-patterned microstructures mainly rely on direct laser energy deposition, and the processing precision and efficiency are very limited. Recently, functional crystal arrays (CAs) with periodically varied optical properties and nanoscale feature sizes have been demonstrated to possess promising applicable prospects in frontier studies, [14,15] but remain very difficult to be obtained with conventional technologies.

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Ultrastable Perovskite Nanocrystals in All‐Inorganic Transparent Matrix for High‐Speed Underwater Wireless Optical Communication

“…As shown in Figure 1, after fully melting of the raw materials at high temperature, SiO 2 and B 2 O 3 broke bonds to form SiO and BO randomly crossed network structure, forming a short‐range ordered but long‐range disordered amorphous structure. Regarding the glass melt as a homogeneous solvent in a certain range, Cs + , Pb 2+ , and Br − ions were distributed in glass melt in a “dissociative state.” [ 30 ] In the rapid quenching and molding of the glass melt process, the cations and anions were still distributed uniformly in the bulk as it took time to migrate in the “viscous solution.” There is a certain internal stress in glass after the rapid quenching and molding from melting temperature to room temperature. The internal stress makes the glass easily crack or even shatter.…”