Effect of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si0232.gif" overflow="scroll"><mml:mrow><mml:mi mathvariant="italic">UV</mml:mi></mml:mrow></mml:math>exposure on photochromic glasses doped with transition metal oxides

El-Zaiat, S.Y.; Medhat, M.; Omar, M. F.; Shirif, M. A.

doi:10.1016/j.optcom.2016.03.010

Cited by 22 publications

(6 citation statements)

References 15 publications

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“…YH x :O y responds to UVA or blue light and presents high transparency in the clear state, therefore it has multitude of potential applications including smart windows, ophthalmic lenses, security markings, and many more . The photochromic family mostly consists of organic materials, but also embraces some inorganic compounds such as silver halides, tungsten oxide, or molybdenum trioxide . Apart from YH x :O y , other oxygen‐containing rare earth hydrides, or oxy ‐ hydrides , such as the ones based on Gd, Dy, and Er have been recently proved to be also photochromic .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Montero

Karazhanov

2018

Physica Status Solidi (a)

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Oxygen‐containing yttrium hydride, YHx:Oy, is an inorganic phothochromic material which exhibits promising features for its application in smart windows, ophthalmic lenses, and many more. In the present work the optical properties of photochromic and non‐photochromic YHx:Oy thin films prepared by magnetron sputtering are studied by variable angle ellipsometry and spectrophotometry. These include the study of the complex refractive index, the transmittance, and luminous transmittance, as well as the reflectance of a selection of samples of diverse structural properties obtained under different deposition conditions. In the case of the photochromic YHx:Oy thin films, the refractive index in the near infrared and visible regions is found similar to the one corresponding to yttrium oxide, Y2O3. However, the YHx:Oy films exhibit a smaller band gap and hence higher absorption in the near ultraviolet than Y2O3. The photodarkening potential of the films are also quantified and characterized by the study and modeling of their optical properties before and after illumination. Our results show that photochromic YHx:Oy films, with a luminous transmittance above 80 % in the clear state, can reduce its transparency up to a 30% after 1 h illumination at 1 Sun.

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Section: Introductionmentioning

confidence: 99%

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Montero

Karazhanov

2018

Physica Status Solidi (a)

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“…Ag halide photochromic glasses doped with one of the transition metal oxides, TiO 2 , CoO, Cr 2 O 3 prepared using the melt quench technique are photochromically active such that they induce different effects on reflectance and transmittance of the glass depending on the amount of doping used. [ 232 ] These glass samples exposed to UV have their spectral reflectance and transmittance measured and the effect of UV exposure investigated.…”

Section: Photochromic Applications Of Oxides and Hybrid Materials In Uv Sensingmentioning

confidence: 99%

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Kayani

Kuriakose

Monshipouri

et al. 2021

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Limited levels of UV exposure can be beneficial to the human body. However, the UV radiation present in the atmosphere can be damaging if levels of exposure exceed safe limits which depend on the individual the skin color. Hence, UV photochromic materials that respond to UV light by changing their color are powerful tools to sense radiation safety limits. Photochromic materials comprise either organic materials, inorganic transition metal oxides, or a hybrid combination of both. The photochromic behavior largely relies on charge transfer mechanisms and electronic band structures. These factors can be influenced by the structure and morphology, fabrication, composition, hybridization, and preparation of the photochromic materials, among others. Significant challenges are involved in realizing rapid photochromic change, which is repeatable, reversible with low fatigue, and behaving according to the desired application requirements. These challenges also relate to finding the right synergy between the photochromic materials used, the environment it is being used for, and the objectives that need to be achieved. In this review, the principles and applications of photochromic processes for transition metal oxides and hybrid materials, photocatalytic applications, and the outlook in the context of commercialized sensors in this field are presented.

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“…8 V 2 O 5 is poor in biocompatibility for toxicity, 17 and ZnO and CoO must be combined with other photochromic materials to improve their color-changing performance. 5,18 In contrast, tungsten oxide (WO 3 ) is colorrepeatable, well-biocompatible, and reversible with high fatigue. 19,20 Furthermore, the most important feature of WO 3 is that it can be continuously switched between two different optical states (from yellowish to blue) in response to light, 21 heat, 22 or electrical stimuli.…”

Section: Introductionmentioning

confidence: 99%

“…Photochromic wearables, generally consisting of fibrous materials incorporated with organic materials, inorganic transition metal oxides (TMOs), or their hybrid, have attracted tremendous attention for future rewritable ink-free media owing to their fast color-switching rates, superior reversibility, and high fatigue resistance. − Compared with organic materials, TMOs are preferable for photochromic wearables because of their higher thermal stability, strength, and chemical resistance. , Thus, various TMOs, such as molybdenum oxide (MoO 3 ), − vanadium oxide (V 2 O 5 ), , zinc oxide (ZnO), , and cobalt oxide (CoO), , have been employed in constructing photochromic materials. Despite its super stability, the color-switching of MoO 3 needs the assistance of strong oxidizing agents .…”

Section: Introductionmentioning

confidence: 99%

“…Despite its super stability, the color-switching of MoO 3 needs the assistance of strong oxidizing agents . V 2 O 5 is poor in biocompatibility for toxicity, and ZnO and CoO must be combined with other photochromic materials to improve their color-changing performance. , In contrast, tungsten oxide (WO 3 ) is color-repeatable, well-biocompatible, and reversible with high fatigue. , Furthermore, the most important feature of WO 3 is that it can be continuously switched between two different optical states (from yellowish to blue) in response to light, heat, or electrical stimuli . As a result, developing WO 3 -based photochromic materials brings exciting opportunities for rewritable ink-free media, smart windows, photochromic electronic textiles (e-textiles), and radiation detection …”

Section: Introductionmentioning

confidence: 99%

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Chelating Coordination Regulated Photochromic Electrospun Nanofibers for Waterproof and Long-Color-Retention Rewritable Wearables

Chen,

Xu,

Han

et al. 2024

ACS Appl. Mater. Interfaces

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Photochromic materials with rapid color-switching, long color retention times, and rewritability are crucial for meeting the requirements of future rewritable ink-free media. However, these requirements are challenging to satisfy simultaneously due to the inherent constraints among these features. Herein, a novel photochromic nanofiber nonwoven fabric was designed and constructed based on a conjugated organic−inorganic hybrid structure through electrospinning and hot-pressing techniques. The as-prepared fabric can change color in merely 5 s under UV irradiation and can reach saturation within 2 min. In addition, upon the introduction of a potent metal chelator, its color retention time exceeds 14 days under ambient conditions, significantly longer than that of most rewritable materials recently reported (several hours to 5 days). Moreover, the fabric exhibits high writing resolution and can be photoprinted and heat-erased for over 100 cycles while still retaining 96% of its initial reflectivity. Hydrophobic thermoplastic polyurethane provides the fabric with excellent waterproof and antifouling properties, thus preventing the composite from swelling or collecting graffiti due to moisture or dust. This work exploits a competitive approach for designing flexible, rewritable, and superior functional wearables with practical applications.

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Effect ofUVexposure on photochromic glasses doped with transition metal oxides

Cited by 22 publications

References 15 publications

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

Spectroscopic Ellipsometry and Microstructure Characterization of Photochromic Oxygen‐Containing Yttrium Hydride Thin Films

UV Photochromism in Transition Metal Oxides and Hybrid Materials

Chelating Coordination Regulated Photochromic Electrospun Nanofibers for Waterproof and Long-Color-Retention Rewritable Wearables

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