Topic
Night vision
About: Night vision is a research topic. Over the lifetime, 6004 publications have been published within this topic receiving 67372 citations.
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TL;DR: In this paper, a La3Ga5GeO14:Tb3+,Cr3+ near-infrared phosphor with high efficiency was prepared by a high-temperature solid-state method.
Abstract: A La3Ga5GeO14:Tb3+,Cr3+ near-infrared phosphor with high efficiency was prepared by a high-temperature solid-state method. The synthesized samples were analyzed by X-ray diffraction (XRD), diffuse reflectance spectroscopy, photoluminescence spectroscopy (PL&PLE), fluorescence decay curves and temperature dependent photoluminescence spectroscopy. Due to the highly efficient energy transfer from Tb3+ to Cr3+ ions, at an excitation wavelength of 373 nm, all La3Ga5GeO14:Tb3+,Cr3+ samples show strong emission bands in the range of 400–1300 nm, and the optimal doping concentration is under the conditions of x = 2.5 mol% and y = 1.4 mol%. In addition, the La2.975Ga4.986GeO14:0.025Tb3+,0.014Cr3+ phosphor showed excellent thermal stability, and the emission intensity at 423 K maintained 62% of the original value at 298 K. NIR pc-LED devices were prepared by combining a La2.975Ga4.986GeO14:0.025Tb3+,0.014Cr3+ phosphor with a 460 nm blue light emitting chip. Photoluminescence with a total output power of 3.018 mW could be achieved at a driving current of 160 mA, indicating the potential application in night vision lighting.
39 citations
TL;DR: Cornea wavefront-guided retreatment was effective in improving subjective night vision symptoms, reducing corneal SA, and decreasing asphericity in eyes that underwent myopic laser refractive surgery.
39 citations
TL;DR: It is concluded that an underground operation produced an increase in psychophysiological activation and a negative effect on memory, being modulated by previous training and experience.
39 citations
Patent•
29 Oct 1999
TL;DR: In this article, a display apparatus includes an IR or other light source that produces light at a first wavelength that is modulated according to a desired image The modulated light is then applied to a phosphor that converts the light to a second wavelength in the visible range.
Abstract: A display apparatus includes an IR or other light source that produces light at a first wavelength that is modulated according to a desired image The modulated light is then applied to a phosphor that converts the light to a second wavelength in the visible range In one embodiment, the image source is a scanned light beam display that scans an IR light beam onto an image intensifier tube of a night vision goggle In other embodiments, the image source is a LCD having an IR back light or a FED panel that emits electrons directly into a microchannel accelerator plate of the night vision goggles In still another embodiment, the image source emits visible or ultraviolet light onto a phosphor that emits light of a different wavelength in response
39 citations
Patent•
10 Sep 1981
TL;DR: An apparatus for use in the cockpit of an aircraft which provides sufficient illumination to read the cockpit display indicators, controls and charts but does not destroy the pilot's night vision is described in this article.
Abstract: An apparatus for use in the cockpit of an aircraft which provides sufficient illumination to read the cockpit display indicators, controls and charts but does not destroy the pilot's night vision. A casing, which is normally worn on the wrist of the pilot, contains a microencapsulated electroluminescent phosphorus lamp which provides illumination that will not affect the pilot's night vision. The lamp is powered by an inverter which is connected through a switch to a power supply, all of which are also contained within the case.
39 citations