278 results about "Emission band" patented technology

An imaging module in one embodiment includes at least one multiple color emitting light source comprising a plurality of different colored LED dies each independently driveable so that the overall color emitted by the light source can be controlled and varied. The multiple color emitting light source can be controlled so that the color emitted by the light source is optimized for imaging or reading in a present application environment of the module. Further, the module can be configured so that control of the multiple color emitting light source automatically varies depending on a sensed condition, such a color present in a field of view of the module, the distance of the module to a target, and / or a predetermined criteria being met so that feedback is provided to a user. The module in a further aspect can include illumination light sources and aiming light sources which project light in different wavelength emission bands.

A luminescent detection system that employs transmission-based detection is provided for use with a chromatographic-based assay device. Unlike conventional systems, the detection system of the present invention is portable, simple to use, and inexpensive. For example, the system may be selectively controlled to reduce reliance on expensive optical components, such as monochromators or narrow emission bandwidth optical filters. In addition, the detection system is also capable of eliminating background interference from many sources, such as scattered light and autofluorescence, which have often plagued conventional fluorescent detection systems.

An objective of the present invention is to provide: an organic electroluminescent element which has high efficiency and a long service life; and an electronic device and a light emitting device, each of which is provided with the organic electroluminescent element. Another objective of the present invention is to provide a light emitting material which has high efficiency and a long service life. An organic electroluminescent element according to the present invention comprises at least one organic layer that is interposed between a positive electrode and a negative electrode. This organic electroluminescent element is characterized in that: at least one organic layer contains a fluorescent compound and a host compound; the internal quantum efficiency by electrical excitation of the fluorescent compound is 50% or more; the half-value width of the emission band of an emission peak wavelength in the emission spectrum of the fluorescent compound at a room temperature is 100 nm or less; and the host compound has a structure represented by general formula (I).

In an array of single crystal acoustic resonators, the effective coupling coefficient of first and second strained single crystal filters are individually tailored in order to achieve desired frequency responses. In a duplexer embodiment, the effective coupling coefficient of a transmit band-pass filter is lower than the effective coupling coefficient of a receive band-pass filter of the same duplexer. The coefficients can be tailored by varying the ratio of the thickness of a piezoelectric layer to the total thickness of electrode layers or by forming a capacitor in parallel with an acoustic resonator within the filter for which the effective coupling coefficient is to be degraded. Further, a strained piezoelectric layer can be formed overlying a nucleation layer characterized by initial surface etching and piezoelectric layer deposition parameters being configured to modulate a strain condition in the strained piezoelectric layer to adjust piezoelectric properties for improved performance in specific applications.

A projection display surface for reducing speckle artifacts from a projector having at least one narrow band light source having an incident visible wavelength band, wherein the incident visible wavelength band has an incident peak wavelength and an incident bandwidth, comprising: a substrate having a reflective layer that reflects incident light over at least the incident visible wavelength band; and a fluorescent agent distributed over the reflective layer, wherein the fluorescent agent absorbs a fraction of the light in the incident visible wavelength band and emits light in an emissive visible wavelength band having an emissive peak wavelength and an emissive bandwidth; wherein return light from the projection display surface produced when incident light in the incident visible wavelength band is incident on the projection display surface contains light in both the incident visible wavelength band and emissive visible wavelength band, thereby reducing speckle artifacts.

Water-soluble, photosensitive, optically variable (POV) inks exhibit improved OCR readability due to improved infrared absorption properties. The inks can produce images that can be viewed with both visible and ultraviolet light to have physically coincident positive and negative images. The new inks contain at least two types of colorants in addition to the IR absorber and other suitable ingredients. The first colorant comprises a fluorescent dye or pigment emitting light within a characteristic emission band when excited by fluorescent-exciting radiation. The second colorant comprises a carbon black infrared radiation absorbing composition alone or with one or more dyes or pigments having a light absorption band at longer wavelengths than the characteristic emission band of the first colorant or also overlapping the emission wavelength of the first colorant in such a way as to result in a dark color. The inks are formulated to provide higher contrast in the presence of IR radiation while retaining a strong negative correlation between the visible and fluorescent images.

A membrane-based assay device for detecting the presence or quantity of an analyte residing in a test sample is provided. The device utilizes time-resolved fluorescence to detect the signals generated by excited fluorescent labels. Because the labels can have relatively long emission lifetime, short-lived background interference can be practically eliminated through delayed fluorescence detection. In addition, the resulting fluorescent reader can have a simple and inexpensive design. For instance, in one embodiment, the reader can utilize a silicon photodiode and a pulsed light-emitting diode (LED) to accurately excite labels and detect fluorescence on a membrane-based assay device without requiring the use of expensive components, such as monochromators or narrow emission band width optical filters.

In a wavelength calibration method, an observed spectrum of a light that has a wavelength band is obtained, wherein the light has at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band. A corrected spectrum is then obtained from the observed spectrum, wherein the corrected spectrum has reduced dependencies upon the full width at half maximum of an emission band of the light and upon an intensity ripple period of the light.

The invention provides near infrared absorbing materials showing high light-to-heat conversion efficiency and high sensitivity to lasers whose emission bands are within the range of 750 nm to 900 nm, original plates for direct printing plate making, and novel compounds which can be applied to such absorbing materials and plates. The compounds are polymethine compounds of the general formula (I) A detailed description of general formula (I) may be found in the specification.wherein R1 represents an alkoxy group which may be substituted; R2 represents an alkyl group which may be substituted; R3 and R4 each represents a lower alkyl group or R3 and R4 taken together represent a ring; X represents a hydrogen atom, a halogen atom or a substituted amino group; Y represents an alkoxy group which may be substituted or an alkyl group which may be substituted; Z represents a charge neutralizing ion.

A high lumen output compact fluorescent lamp is disclosed that has a luminous efficiency of 40 lumen / W or higher. The fluorescent lamp comprises an envelope enclosing a discharge space, means for providing a discharge in the discharge space, a discharge gas sealed in the discharge space and a fluorescent layer made of a phosphor blend coated on the inner surface of the envelope. The phosphor blend comprises a, 55 to 80 weight % of a first phosphor having an emission band with a maximum between 620 nm and 635 nm and having a half-value width of 70 nm to 150 nm, b, 5 to 30 weight % of a second phosphor having an emission band with a maximum between 605 nm and 615 nm and having a half-value width of 1 nm to 10 nm, c, 0 to 20 weight % of a third phosphor having an emission band with a maximum between 540 nm and 550 nm and having a half-value width of 1 nm to 10 nm, and d, 0 to 30 weight % of a fourth phosphor having an emission band with a maximum between 480 nm and 500 nm and having a half-value width of 50 nm to 80 nm. The lamp havs an Ra value greater than 90 and a photographic color temperature between 3000 K and 3500 K.A lamp is also disclosed in which the phosphor blend comprises: a, 20 to 60 weight % of a first phosphor having an emission band with a maximum between 620 nm and 635 nm and having a half-value width of 70 nm to 150 nm, b, 20 to 65 weight % of a second phosphor having an emission band with a maximum between 480 nm and 500 nm and having a half-value width of 50 nm to 95 nm, c, 0 to 20 weight % of a third phosphor having an emission band with a maximum between 450 nm and 460 nm and having a half-value width of 40 nm to 65 nm and d, 0 to 30 weight % of a fourth phosphor having an emission band with a maximum between 610 nm and 630 nm and having a half-value width of 1 nm to 10 nm. This lamp has an Ra value greater than 90 and a photographic color temperature between 5000 K and 6000 K.

Methods and apparatus for providing a tunable absorption-emission band in a wavelength selective device are disclosed. A device for selectively absorbing incident electromagnetic radiation includes an electrically conductive surface layer including an arrangement of multiple surface elements. The surface layer is disposed at a nonzero height above a continuous electrically conductive layer. An electrically isolating intermediate layer defines a first surface that is in communication with the electrically conductive surface layer. The continuous electrically conductive backing layer is provided in communication with a second surface of the electrically isolating intermediate layer. When combined with an infrared source, the wavelength selective device emits infrared radiation in at least one narrow band determined by a resonance of the device. In some embodiments, the device includes a control feature that allows the resonance to be selectively modified. The device has broad applications including gas detection devices and infrared imaging.

To detect flames burning carbon-free hydrogen-bearing fuels, first, second, and third sensors sense first, second and third regions of an infrared water emission band, and generate first, second, and third signals. A processor generates an alarm when the sensors indicate flame. The first region low cut-off wavelength may be lower than the second region low cut-off wavelength. The third region high cut-off wavelength may be higher than the second region high cut-off wavelength. The combined regions may include nearly the entire water emission band. The processor may discriminate distances to flames using the sensor signals. A fourth sensor may sense moisture concentration, and the processor may discriminate distances based thereon. The regions may be defined such that for a fire, all three regions receive substantial energy, with second region to first region energy ratio less than 1:1 and a second region to third region energy ratio less than 1:1.