Optical Materials and Their Properties

Brinkmann, Matthias; Hayden, Joseph S.; Letz, Martin; Reichel, Steffen; Click, Carol A.; Mannstadt, W.; Schreder, B.; Wolff, Silke; Ritter, Simone M.; Davis, Mark J.; Bauer, Thomas; Ren, Hongwen; Fan, Yun‐Hsing; Menke, Yvonne; Wu, Shin‐Tson; Bonrad, Klaus; Krätzig, E.; Buse, K.; Paquin, Roger A.

doi:10.1007/978-3-642-19409-2_5

Cited by 7 publications

(3 citation statements)

References 366 publications

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“…Indoor lighting materials have a strong influence on the physical and psychological well-being of building occupants . These materials are typically made of nonsustainably sourced glass, silicon, plastic, and polymer hybrid composites, − with a lack of biodegradability, generating an end-of-life environmental burden. However, there is an emerging consumer-driven demand toward eco-friendly and bio-based materials for optical applications. − Recent scientific progress opens up opportunities to utilize natural materials such as cellulose and wood in this particular application field …”

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confidence: 99%

Luminescent and Hydrophobic Wood Films as Optical Lighting Materials

Goldhahn

et al. 2020

ACS Nano

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Most materials used for optical lighting applications need to produce a uniform illumination and require high mechanical and hydrophobic properties. However, they are rarely eco-friendly. Herein, a bio-based, polymer matrix-free, luminescent, and hydrophobic film with excellent mechanical properties for optical lighting purposes is demonstrated. A template is prepared by turning a wood veneer into porous scaffold from which most of the lignin and half of the hemicelluloses are removed. The infiltration of quantum dots (CdSe/ZnS) into the porous template prior to densification resulted in almost uniform luminescence (isotropic light scattering) and could be extended to various quantum dot particles, generating different light colors. In a subsequent step, the luminescent wood film is coated with hexadecyltrimethoxysilane (HDTMS) via chemical vapor deposition. The presence of the quantum dots coupled with the HDTMS coating renders the film hydrophobic (water contact angle ≈ 140°). This top-down process strongly eliminates lumen cavities and preserves the orientation of the original cellulose fibrils to create luminescent and polymer matrix-free films with high modulus and strength in the direction of fibers. The proposed optical lighting material could be attractive for interior designs (e.g., lamps and laminated cover panels), photonics, and laser devices.

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confidence: 99%

Luminescent and Hydrophobic Wood Films as Optical Lighting Materials

Goldhahn

et al. 2020

ACS Nano

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“…Optical functions, including complex refractive indices and dielectric functions, represent the response of materials to the light and reflect the intrinsic light–matter interactions, 18–20 such as interband transition, 21,22 excitonic effect, 23,24 etc . For low-symmetry materials, anisotropic optical functions can be used to quantitatively evaluate and modulate the optically anisotropic phenomena.…”

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confidence: 99%

Giant in-plane optical and electronic anisotropy of tellurene: a quantitative exploration

Guo

Fang

et al. 2022

Nanoscale

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“…Consequently, openair/partially sealed laser cavities are susceptible to fluctuations of the above mentioned variables, if appropriate compensation is not included in the laser design. [23][24][25] Thus, a variation in the laser wavenumber and subsequently in the measured Raman band positions is possible due to change in the ambient pressure, temperature, and humidity. These three parameters are expected to play the most important role in addressing the reproducibility and stability of Raman experiments; they receive therefore pronounced attention in the current study.…”

Section: Introductionmentioning

confidence: 99%

Evaluating stability of a Raman spectrometer for long‐time experiments

Raj

Witek

Hamaguchi

2021

J Raman Spectroscopy

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Raman spectroscopic measurements spanning several hours to days are increasingly common and important. The stability of a Raman spectrometer becomes crucial when comparing spectra recorded at different occasions in such time‐intensive experiments. In this work, series of Raman spectra of benzene and emission spectra of neon were acquired using a standard Raman spectrometer operating in a typical air‐conditioned laboratory, with synchronized measurements of ambient parameters (pressure, temperature, humidity, etc.) subject to continuous unsystematic environmental drifts. The time‐dependent fluctuations of positions and intensities of selected bands in the series of spectra recorded over tens of hours displayed variations of up to ±0.3 cm−1 in the band positions and up to 2% in the associated Raman intensities, with experiments over longer time periods prone to more pronounced fluctuations. After accounting for change in the laser power fluctuations, the intensity variations were reduced to about 1%. Both the variations in the band positions and intensities showed practically no correlation with either of the ambient parameters or the refractive index of air. Tiny drifts in the laser wavenumber (on the order of 0.01 cm−1), attributed to the change in the refractive index of the laser cavity associated with the variations in the ambient pressure, were too small to account for the observed fluctuations in the band positions.

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Optical Materials and Their Properties

Cited by 7 publications

References 366 publications

Luminescent and Hydrophobic Wood Films as Optical Lighting Materials

Luminescent and Hydrophobic Wood Films as Optical Lighting Materials

Giant in-plane optical and electronic anisotropy of tellurene: a quantitative exploration

Evaluating stability of a Raman spectrometer for long‐time experiments

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