A Full Vacuum Approach for the Fabrication of Hybrid White‐Light‐Emitting Thin Films and Wide‐Range In Situ Tunable Luminescent Microcavities

Oulad-Zian, Youssef; Sánchez‐Valencia, Juan R.; Oliva, Manuel; Parra-Barranco, Julian; Alcaire, Maria; Aparicio, Francisco J.; Mora‐Boza, Ana; Espinós, J.P.; Yubero, F.; González‐Elipe, Agustín R.; Barranco, Ángel; Borrás, Ana

doi:10.1002/adom.201600138

Cited by 3 publications

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References 57 publications

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“…[25] These difficulties in the implementation are critical when dealing with large scales, limiting their applications in real optoelectronic devices. [15,23,25] In this work, we propose the application of an evolved version of the vacuum technique glancing-angle deposition (GLAD) [26][27][28][29] as an advanced alternative to the synthesis of anisotropic-supported OMHP nanostructures. GLAD has gained interest and prominence as a tool to tune the nanostructure and compactness of thin films and layers.…”

Section: Introductionmentioning

confidence: 99%

“…These nanocolumns are highly separated along the direction of the vapor source, while along the perpendicular direction are associated, this latter effect is known as "bundling". [26][27][28][29] The bundling effect provides the direct formation of aligned nanostructures on most possible substrates, including photovoltaic devices. [30] Even though its experimental simplicity, the application of GLAD has already revolutionized the fabrication of tailored porous and sculptured films in topics ranging from energy to biomaterials, including optics and optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we propose the application of an evolved version of the vacuum technique glancing‐angle deposition (GLAD) [ 26–29 ] as an advanced alternative to the synthesis of anisotropic‐supported OMHP nanostructures. GLAD has gained interest and prominence as a tool to tune the nanostructure and compactness of thin films and layers.…”

Section: Introductionmentioning

confidence: 99%

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Highly Anisotropic Organometal Halide Perovskite Nanowalls Grown by Glancing‐Angle Deposition

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optoelectronic properties, finding applications as solar cells, [1,2] light-emitting devices, [3,4] and photodetectors. [5][6][7] Within these applications, the synthesis by vacuum deposition arises as an industrial scalable, low cost, and environmentally friendly methodology to fabricate efficient, stable, and durable optoelectronic devices. [8][9][10][11] Moreover, the anisotropic nanostructuration of OMHP such as nanorods, nanowires, or nanoplatelets has been achieved by different routes, [6,[12][13][14] which can be divided into template-and chemical-assisted growth: [15] the first makes use of template structures such as electrospun fibers [16] or nanostructures such as pillars or grooves [17,18] to grow the OMHP in its interior, while the second, the most used, employs solution synthetic approaches to control the growth such as surfactants or anion-exchange reactions, among others. [12,19] One crucial characteristic of these semiconductor anisotropic nanostructures is their polarizationsensitive optoelectronic response. [15,[20][21][22] Although many of our current devices make use of polarizers to produce polarized light, there are several drawbacks, such as the reduced intensity of the generated beam and/or their integration in micro-and nanoscale devices, limiting the overall efficiency of the optoelectronic systems. [15,23] Polarizers are ubiquitous components in current optoelectronic devices as displays or photographic cameras. Yet, control over light polarization is an unsolved challenge, since the main drawback of the existing display technologies is the significant optical losses. In such a context, organometal halide perovskites (OMHP) can play a decisive role given their flexible synthesis with tunable optical properties such as bandgap and photoluminescence, and excellent light emission with a low non-radiative recombination rate. Therefore, along with their outstanding electrical properties have elevated hybrid perovskites as the material of choice in photovoltaics and optoelectronics. Among the different OMHP nanostructures, nanowires and nanorods have lately arisen as key players in the control of light polarization for lighting or detector applications. Herein, the fabrication of highly aligned and anisotropic methylammonium lead iodide perovskite nanowalls by glancing-angle deposition, which is compatible with most substrates, is presented. Their high alignment degree provides the samples with anisotropic optical properties such as light absorption and photoluminescence. Furthermore, their implementation in photovoltaic devices provides them with a polarization-sensitive response. This facile vacuum-based approach embodies a milestone in the development of last-generation polarization-sensitive perovskite-based optoelectronic devices such as lighting appliances or self-powered photodetectors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Highly Anisotropic Organometal Halide Perovskite Nanowalls Grown by Glancing‐Angle Deposition

et al. 2022

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Fluorescence Manipulation of Carbon Dots by 1D Photonic Crystals

Shen

et al. 2018

Advanced Optical Materials

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Luminescent carbon dots (CDs) hold great potential in the light‐emitting diode (LED) application on account of their high photostability and eco‐friendliness. The utilization of LED in display requires pixel sources of pure and saturated colors. To optimize the broad emission of CDs, a versatile approach for narrowing the fluorescence of CDs via 1D photonic crystals (1DPCs) is developed. The 1DPC reported herein has sandwiched a thicker layer of CDs in the middle of two hybrid periodic laminar structures, yielding a transmittance dip. CDs are utilized as prepared without further purification. The transmittance dip is able to be tuned by altering the thickness of layers. Such background thus permits the adjustment of structural properties to narrow the full width at half‐maximum (FWHM) and manipulate the emission color of LED device (composed of a GaN chip and the 1DPC). The transmittance dip enhances the fluorescence intensity, which is quite different from the traditional color filter such as liquid crystal. Furthermore, the mechanism of fluorescent manipulation is confirmed by the assistance of a finite‐difference time‐domain (FDTD) simulation. Such fluorescence tuning not only molds emission properties of CDs but also provides possibilities for the construction of more efficient devices for color purification.

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Ordered Hybrid Micro/Nanostructures and Their Optical Applications

Zhang

Yang

2019

Advanced Optical Materials

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known that the optical properties related refractive index is an important parameter for ordered micro/nanostructures. Commonly, organic substances own lower refraction. Aiming at improving which, researchers introduce highly polarizable heteroatoms or rigid aromatic moieties. However, the maximum of refractive index is limited to 1.54-1.60, [3] which is far from the requirements of rapidly developing technologies. [4] Incorporation of inorganic materials with relative higher refractive index (TiO 2 , ZnO, ZnS, graphene nanoparticles, and Si) into an organic matrix is capable of enlarging the optical parameters to a great extent, generally up to a value of 2.5-3.0, [5] which offers more chances for the fabrication of novel ordered micro/nanostructures. Photonic crystals (PCs), for example, regularly arrange materials of high and low dielectric constants on the order of the wavelength of light. The photonic bandgap (PBG) prohibiting the propagation of light results from the sufficient dielectric contrast and appropriate geometry. The structural color therefore generates. Manipulating the propagation of light via micro/nanostructures meets the requirements for modern optical devices. [6] As a result, more efforts have been applied to devices consisting of micro/nanostructures of multiple materials, such as synthetic materials and biomaterials. [7] Besides optical properties, the strength and toughness of ordered micro/nanostructures are also improved based on the hybrid material. Meanwhile, the electric and magnetic features of inorganic dopants can also exactly assist the adjustability. Therefore, the hybrid can significantly improve performance compared with its constituent.This review emphasizes on applications sought (sensing, imaging, communication, photoelectricity, etc.), the materials used (silicon, metals, polymers, etc.), and the preparation methods employed (patterning, etching, deposition, etc.). We present an attempt to classify and compare some intensively reported micro/nanostructures of hybrid materials and/or heterogeneous structures, along with recent important developments in literatures. It is organized as follows: First, we summarize some fundamental physical principles and concepts in brief. Second, we particularly highlight artificial and natural laminar structures, represented by Bragg stacks (BSs) and butterfly wings, which have drawn much attention in the latest literatures. Next, the focus shifts to the preparation routes and materials adoption of colloidal crystals and their derived periodic arrays. A few examples of highly functional materials Recent advances in manufacturing and technology of ordered hybrid micro/ nanostructures have acquired many breakthroughs. With the aid of the cooperation of various materials, the ordered hybrid micro/nanostructures exhibit high-quality performance and mechanical stability and allow the modulation on the light-matter interaction in a controllable manner, thereby enabling a wide variety of innovative applications. This article reviews recent deve...

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A Full Vacuum Approach for the Fabrication of Hybrid White‐Light‐Emitting Thin Films and Wide‐Range In Situ Tunable Luminescent Microcavities

Cited by 3 publications

References 57 publications

Highly Anisotropic Organometal Halide Perovskite Nanowalls Grown by Glancing‐Angle Deposition

Highly Anisotropic Organometal Halide Perovskite Nanowalls Grown by Glancing‐Angle Deposition

Fluorescence Manipulation of Carbon Dots by 1D Photonic Crystals

Ordered Hybrid Micro/Nanostructures and Their Optical Applications

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