The human reception of light includes image-forming and non-image-forming effects which are triggered by spectral distribution and intensity of light. Ideal lighting is similar to daylight, which could be evaluated by spectral or chromaticity match. LED-based and CFL-based lighting were analyzed here, proposed according to spectral and chromaticity match, respectively. The photobiological effects were expressed by effectiveness for blue light hazard, cirtopic activity, and photopic vision. Good spectral match provides light with more similar effects to those obtained by the chromaticity match. The new parameters are useful for better evaluation of complex human responses caused by lighting.
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http://dx.doi.org/10.1364/AO.53.005147 | DOI Listing |
J Fluoresc
November 2024
Department of Physics, Kalasalingam Academy of Research and Education, Krishnan Koil, 626126, Tamil Nadu, India.
Eu activated ZnSiO red phosphor synthesized by pyrolysis technique at 1000ºC for one hour is reported. Upon excitation by 394 nm and 464 nm, the phosphor displays a distinct red emission peaking around 614 nm, a characteristic of f-f electronic transitions involving Eu ions.Incorporating alkali metal ions such as Li, Na and K into ZnSiO:Eu phosphor led to a remarkable increase in photoluminescence (PL) intensity.
View Article and Find Full Text PDFAdv Mater
December 2024
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, Nanjing University, Nanjing, 210093, P. R. China.
Full-spectral optical camouflage is of broad interest and in urgent demand because of everlasting safety pursuit in modern society. However, the widely existing dim scenarios call for not only broadband low thermal detectivity but also wide-gamut camouflaging colors with both low lightness and minimal chromatism. Here, a tape-like metamaterial (meta-tape) with broad spectral manipulation bandwidth from visible to mid-infrared is demonstrated.
View Article and Find Full Text PDFMicrosc Microanal
November 2024
Center for Visualizing Catalytic Processes (VISION), Department of Physics, Fysikvej Building 307, Technical University of Denmark, Kongens Lyngby 2800, Denmark.
J Med Life
August 2024
Operative Dentistry Department, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
Recent composites are being developed to simplify shade matching in composite restorations. Only a limited amount of research has been conducted to determine the optical performance of this newly introduced composite in this area. This study investigated the Omnichroma (OMN) color matching (a single shade composite within type-I restorations) via simulated clinical cavities.
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