Composite Structures with Emissive Quantum Dots for Light Enhancement

Abstract

The optical properties of these nanostructures can be controlled via precise control of the synthetic parameters resulting in a wide range of chemical compositions, shapes, and dimensions. QDs are quite advantageous in comparison to traditional organic dye counterparts, offering size, and composition dependent energy band gaps (i.e., tunable absorption and photoluminescence), prospective excellent photostability, and solution and aqueous processability based on choice of surface chemistries. [2] Intense research in this field in the past two decades has focused on precisely engineering core-shell composition of QD nanostructures resulting in an appreciable impact on the field of photonic materials and structures to develop composite nanomaterials with precise control of refractive index, permittivity, and permeability.QDs are the promising candidate to control interactions in photonic systems in many respects due to their enhanced photostability, near 100% quantum yield, and versatile surface chemistry. More recently, facile synthetic techniques for large-scale high-quality production have been introduced that involve wet chemical processes to expand applicability of these components in light-managements devices. [5][6][7] However, the overall processability and scalability of these components into robust large-area structures are still a critical concern limiting real-life implementation in robust designs. While there are many techniques to produce QDs, common limitations for this class of nanomaterials are low quantity, large dispersibility in size, compositional nonuniformity, and the presence of excess passive components resulting from wet chemistry synthetic procedures (e.g., ligands).Providing a convenient host matrix not only overcomes some of these common limitations but allows for QDs to be used in more technologically exploitable forms such as robust, flexible, mechanically and chemically stable fibers, coatings, films, and patterns. [8] For such composite systems, inclusion of nanoparticles into sophisticated matrices typically results in the significant improvements of thermal, mechanical, electrical, and optical stabilities making them more applicable in device environment than other traditional organic materials.While the concept of embedding various nanostructures into different surrounding materials is not new, synthetic techniques required to combine these can be rather complex. Most Since their inception, quantum dots have proven to be advantageous for light management applications due to their high brightness and wellcontrolled absorption, scattering, and emission properties. As quantum dots become commercially available at large scale, the need for robust, stable, and flexible optical components continues to drive the development of robust and flexible quantum dot composite materials. In this review, after a thorough introduction to quantum dots, discussion delves into methods for fabricating quantum dot loaded composite optical elements such as thin films, microfabricated patterns, and micros...

Surface modification and fabrication of white‐light‐emitting Tm3+/CdS quantum dots co‐doped glass fibers

“…Two models corresponding to pure CdS QDs and Tm 3+ co‐doped QDs samples were built in Figure A, B, respectively. Both have the shapes of perfect cubes . The model doping with a Tm 3+ ions (Figure B) was founded to study the Tm 3+ ions perturbation effect.…”

“…Both have the shapes of perfect cubes. 23 The model doping with a Tm 3+ ions ( Figure 2B) was founded to study the Tm 3+ ions perturbation effect. Figure 2C CdS QDs and Tm 3+ co-doped QDs samples.…”

“…. Since CdS is an important direct‐band semiconductor with a band gap (Eg) of 2.5 eV, by using a suitable synthesis route, CdS QDs' emitting wavelength can cover whole yellow light region. It is an ideal tunable yellow‐light emitting center for the white‐light‐emitting fibers.…”

Recent Advances on Nanocomposite Resists With Design Functionality for Lithographic Microfabrication

“…Luminescent NCPRs have many applications: photo-curing of PRs with embedded QDs has been studied for on-chip detection of heavy metal ions (Xu et al, 2013), bar-coding particles (Zhao et al, 2011), development of high quality displays (Li et al, 2019c) and deterministic integration of quantum emitters into waveguides (Lio et al, 2019;Xu et al, 2020b), nanoantennas (Broussier et al, 2019) and remotely controllable magnetic structures (Au et al, 2020). A recent review by Smith et al contains a section on lithographically pattered QD NCPRs (Smith et al, 2019).…”

Enhanced Photoluminescence in Quantum Dots–Porous Polymer Hybrid Films Fabricated by Microcellular Foaming

“…In recent years, colloidal quantum dots (QDs) have emerged as an alternative to conventional rare‐earth phosphors in display and general illumination applications due to their outstanding properties, such as broad absorption band, narrow emission linewidth, tunable peak emission wavelength, and high photoluminescence quantum yield (PLQY) . In such applications, QDs are dispersed into a polymeric matrix to form hybrid films, which usually serve as free‐standing, remote‐type configurations excited by an external UV/blue light source .…”