Dual-Functional WO<sub>3</sub> Nanocolumns with Broadband Antireflective and High-Performance Flexible Electrochromic Properties

Xiao, Lili; Lv, Ying; Wu, Dong; Zhang, Nan; Liu, Xingyuan

doi:10.1021/acsami.6b08895

Cited by 63 publications

(33 citation statements)

References 39 publications

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“…The thickness of the low‐ and high‐index layers are about 62 and 56 nm, respevtively, which are equivalent to quarter wavelength of the designed wavelength (450 nm). The microstructures of each layer in ECDBRs are similar to that of single WO 3 flm on indium tin oxide (ITO) . The WO 3 ‐75° layer has a tilt and disjunctive nanocolumnar structure with a slant angle of ≈50°, a feature size less than 20 nm and pore diameter less than 15 nm.…”

Section: Resultsmentioning

confidence: 91%

“…The ECDBRs were fabricated by alternately changing the deposition angle with the GLAD electron‐beam deposition method. We have shown in our previous study that the porosity and refractive index of WO 3 films can be finely adjusted by changing the deposition angle between substrate and evaporation source . The refractive index of the WO 3 films at 550 nm decreased from 1.94 to 1.56 with an increase of porosity from ≈15% to 58% as the grazing angle increased from 0° to 75°.…”

Section: Resultsmentioning

confidence: 95%

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WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

Xiao

Lin

et al. 2017

Advanced Optical Materials

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with various refractive indices are critical components in optical feedback systems for lasers [4] and also play an important role in high-performance light-emitting devices, [5,6] photodetectors, [7] and solar cells. [8,9] The optical properties of such systems can be precisely tailored by manipulating the chemical composition and architecture (thickness and porosity) of stacked layers. Recently, special research interests lie in responsive DBRs, in which dynamical changes of the optical properties (reflectivity, band-gap, structural color) in response to external stimuli (such as light, temperature, chemical species, and electrical field) have been demonstrated. [10][11][12][13] Among them, electrical field is the most easily controlled stimulus and simplifies integration into existing electronic components, finding new applications in active filters, tunable laser sources, and color manipulation for optical communication and display technologies.In this regard, redox-active polymers, [14][15][16] polyelectrolyte hydrogels, [17,18] liquid crystals, [19,20] or electrochromic materials [21,22] have been introduced into the periodic structure for realizing electrically tuned optical coatings. The shape and size manipulation using redox-active polymers, polyelectrolyte hydrogel, and liquid crystal usually cause large reflectance shifts, but slow response and poor durability, unsuitable for practical applications. By comparison, electrochromic materials can reversibly change their electronic structure and optical property (transmittance, reflectance, or absorption) under a small driving voltage and have been widely applied in energysaving smart windows, switchable mirrors, and displays. [23][24][25][26] This color change is mainly caused by the adjustable absorption as well as change of refractive index. Moreover, electrochormic materials have unique open-circuit memory effect (bistability in colored and bleached states), making it possible to prepare devices with low energy consumption and good stability. [27] DBRs employ two kinds of electrochromic materials with different refractive indices such as WO 3 and NiO and have shown electrically tunable reflectivity and photonic stop-band. [22] However, the preparation process was relatively complex with the requirement for high-temperature calcination at 450 C after depositing of each layer. In addition, complementary coloration effects of WO 3 (cathodic coloration) and NiO (anodic coloration)The electroresponsive WO 3 -based electrochromic distributed Bragg reflectors (ECDBRs) are fabricated by means of one-step, room temperature glancingangle electron-beam evaporation. The reflectance and Bragg wavelength of ECDBRs can be precisely and reversibly tailored on a large scale by simply applying a small bias voltage (±1.1 V) due to the electrochromic effect of the WO 3 layer, and this unique character is utilized to construct an electrically tunable microcavity luminescent device with embedded green CdSe@ZnS quantum dots (QDs). Therefore, large and reversible modulation i...

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 95%

WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

Xiao

Lin

et al. 2017

Advanced Optical Materials

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Section: Ar Materials and Fabrication Techniquesmentioning

confidence: 99%

Transparent Surfaces Inspired by Nature

Motamedi

Warkiani

Taylor

2018

Advanced Optical Materials

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Nature has long inspired scientists and engineers. As one ubiquitous example of this, nature has provided all with several clever methods to absorb, repel, and/or allow both sunlight and water to pass through surfaces. Moth's eyes (highly antireflective) and lotus leaves (highly hydrophobic and self‐cleaning) represent durable natural surfaces which exhibit nearly ideal physical and optical properties. Man‐made transparent surfaces must also be able to cope with water and dust while reaching the maximum possible light transmission for solar collectors, displays, and other optical devices. To explore the link between these – particularly for transparent surfaces – this review puts the physics, progress, and limitations of synthetic materials in context with natural materials. This perspective reveals that there is still much more to learn (and implement) if it is hoped to match the multifunctionality and resilience of natural materials.

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“…Among the various forms of tungsten materials, tungsten oxides are important semiconductors, which can be used in solar-driven photocatalysis [1][2][3], electrochromism [4], and photochromism [5]. In addition, tungsten oxides are highly sensitive to many kinds of gas, which are considered as one of the most promising gas sensing materials for the detection of NH 3 , H 2 S, NO x , O 3 , H 2 , and so on [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Role of Oxygen Vacancies in the Electrical Properties of WO_3−x Nano/Microrods with Identical Morphology

Shen

Zhao

Wen

et al. 2018

Journal of Nanomaterials

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Tungsten oxide (WO 3−x ) crystalline nano/microrods with identical morphology but different contents of oxygen vacancies were prepared by thermally evaporating fixed amount of WO 3 powder in reductive atmosphere from different amounts of S power at 1150 ∘ C in a vacuum tube furnace, in which both sources were loaded in separate ceramic boat. With increasing amount of S powder, a series of tungsten oxides, WO 3 , WO 2.90 , W 19 O 55 (WO 2.89 ), and W 18 O 49 (WO 2.72 ), could be obtained. And devices were fabricated by screen-printing the obtained WO 3−x crystals on ceramic substrates with Ag-Pd interdigital electrodes. With increasing content of oxygen vacancies, the devices fabricated with WO 3−x crystals present a negative to positive resistance response to relative humidity. Under dry atmosphere, for the devices with increasing , the strong response to light changed from short to long wavelength; under light irradiation, the conducting ability of the devices was enhanced, due to the more efficient separation and transportation of the photogenerated carriers; and under simulated solar irradiation, the photocurrent intensity of the W 18 O 49 device was roughly 8 times, about 500 times, and even 1000 times larger than that of the W 19 O 55 , WO 2.90 , and WO 3 one, respectively. With the versatile optoelectrochemical properties, the obtained WO 3−x crystals have the great potential to prepare various humidity sensors and optoelectrical devices.

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Dual-Functional WO₃ Nanocolumns with Broadband Antireflective and High-Performance Flexible Electrochromic Properties

Cited by 63 publications

References 39 publications

WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

Transparent Surfaces Inspired by Nature

Role of Oxygen Vacancies in the Electrical Properties of WO_3−x Nano/Microrods with Identical Morphology

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Dual-Functional WO3 Nanocolumns with Broadband Antireflective and High-Performance Flexible Electrochromic Properties

Cited by 63 publications

References 39 publications

WO3‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

WO3‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

Transparent Surfaces Inspired by Nature

Role of Oxygen Vacancies in the Electrical Properties of WO3−x Nano/Microrods with Identical Morphology

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Product

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Dual-Functional WO₃ Nanocolumns with Broadband Antireflective and High-Performance Flexible Electrochromic Properties

WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

WO₃‐Based Electrochromic Distributed Bragg Reflector: Toward Electrically Tunable Microcavity Luminescent Device

Role of Oxygen Vacancies in the Electrical Properties of WO_3−x Nano/Microrods with Identical Morphology