Phosphor Blends For High Cri Fluorescent Lamps PDF Download
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Download Phosphor Blends for High-CRI Fluorescent Lamps Book in PDF, ePub and Kindle
A phosphor blend comprises at least two phosphors each selected from one of the groups of phosphors that absorb UV electromagnetic radiation and emit in a region of visible light. The phosphor blend can be applied to a discharge gas radiation source to produce light sources having high color rendering index. A phosphor blend is advantageously includes the phosphor (Tb, Y, LuLa, Gd).sub.x(Al, Ga).sub.yO.sub. 12:Ce.sup. 3+, wherein x is in the range from about 2.8 to and including 3 and y is in the range from about 4 to and including 5.
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Release | : 2005 |
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Download Red Phosphors for Use in High CRI Fluorescent Lamps Book in PDF, ePub and Kindle
Novel red emitting phosphors for use in fluorescent lamps resulting in superior color rendering index values compared to conventional red phosphors. Also disclosed is a fluorescent lamp including a phosphor layer comprising blends of one or more of a blue phosphor, a blue-green phosphor, a green phosphor and a red a phosphor selected from the group consisting of SrY.sub. 2 O.sub. 4 :Eu.sup. 3+, (Y, Gd)Al.sub. 3 B.sub. 4 O.sub. 12 :Eu.sup. 3+, and [(Y.sub. 1-x-y-m La.sub.y)Gd.sub.x]BO.sub. 3 :Eu.sub.m wherein y
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Release | : 2005 |
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Download Blue-green Phosphor for Fluorescent Lighting Applications Book in PDF, ePub and Kindle
A fluorescent lamp including a phosphor layer including Sr.sub. 4 Al.sub. 14 O.sub. 25 :Eu.sup. 2+ (SAE) and at least one of each of a red, green and blue emitting phosphor. The phosphor layer can optionally include an additional, deep red phosphor and a yellow emitting phosphor. The resulting lamp will exhibit a white light having a color rendering index of 90 or higher with a correlated color temperature of from 2500 to 10000 Kelvin. The use of SAE in phosphor blends of lamps results in high CRI light sources with increased stability and acceptable lumen maintenance over, the course of the lamp life.
Author | : S. K. Omanwar |
Publisher | : CRC Press |
Total Pages | : 321 |
Release | : 2022-05-11 |
Genre | : Science |
ISBN | : 1000581241 |
Download Borate Phosphors Book in PDF, ePub and Kindle
Borate-based phosphors have attracted much attention, due to their high optical stability, low-cost synthesis via conventional and non-conventional methods and resulting technology to be environmentally friendly. This book discusses the structural and chemical parameters of borates as a phosphor including suitable synthesis methods and proper characterization of materials. Further, it includes applications of borate materials such as photoluminescence, UV application, UVU application, photo therapy application and radiological applications. Features: Provides information on borate phosphors and their structure. Aids selection of proper structural and functional borates used in applications based on phosphor technology. Discloses the modification in properties of borate functional group upon mixing or substitution with other metallic functional groups. Discusses biological applications such as photo-thermal heating-based therapy, temperature sensors, imaging, and diagnosis. Includes current trends and innovations, limitations and challenges, prospects, and scope in each chapter. This book is aimed at researchers and graduate students in inorganic materials, luminescent/optical materials, materials science/engineering, and physics.
Author | : A.H. Kitai |
Publisher | : Springer Science & Business Media |
Total Pages | : 389 |
Release | : 2012-12-06 |
Genre | : Technology & Engineering |
ISBN | : 9401115222 |
Download Solid State Luminescence Book in PDF, ePub and Kindle
Historically, black body radiation in the tungsten filament lamp was our primary industrial means for producing 'artificial' light, as it replaced gas lamps. Solid state luminescent devices for applications ranging from lamps to displays have proliferated since then, particularly owing to the develop ment of semiconductors and phosphors. Our lighting products are now mostly phosphor based and this 'cold light' is replacing an increasing fraction of tungsten filament lamps. Even light emitting diodes now chal lenge such lamps for automotive brake lights. In the area of information displays, cathode ray tube phosphors have proved themselves to be outstandingly efficient light emitters with excellent colour capability. The current push for flat panel displays is quite intense, and much confusion exists as to where development and commercialization will occur most rapidly, but with the need for colour, it is now apparent that solid state luminescence will play a primary role, as gas phase plasma displays do not conveniently permit colour at the high resolution needed today. The long term challenge to develop electroluminescent displays continues, and high performance fluorescent lamps currently illuminate liquid crystal monochrome and colour displays. The development of tri component rare earth phosphors is of particular importance.
Author | : William O. Jenkins, Jr. |
Publisher | : DIANE Publishing |
Total Pages | : 207 |
Release | : 2005-09 |
Genre | : |
ISBN | : 1422300676 |
Download Protection of Chemical and Water Infrastructure Book in PDF, ePub and Kindle
The chemical & water sectors are 2 of the sectors that if attacked by terrorists could have a debilitating impact on the nation. There are 4,000 chemical mfg. facil. that produce, use, or store more than threshold amounts of chem. that pose the greatest risk to human health & the environ. There are 53,000 community water systems & more than 2,900 maritime facilities that are required to comply with security reg. This report provides info. about what fed. require. exist for the chem. & water sectors to secure their facil., what fed. efforts were taken by the agencies for these sectors to facilitate sectors' actions, what actions selected facil. within these sectors have taken & whether they reflect a risk mgmt. approach, & what obstacles they faced in implem. enhanc.
Author | : E. Fred Schubert |
Publisher | : Cambridge University Press |
Total Pages | : 433 |
Release | : 2006-06-08 |
Genre | : Technology & Engineering |
ISBN | : 1139455222 |
Download Light-Emitting Diodes Book in PDF, ePub and Kindle
Revised and fully updated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of advanced device structures. With nine additional chapters, the treatment of LEDs has been vastly expanded, including new material on device packaging, reflectors, UV LEDs, III-V nitride materials, solid-state sources for illumination applications, and junction temperature. Radiative and non-radiative recombination dynamics, methods for improving light extraction, high-efficiency and high-power device designs, white-light emitters with wavelength-converting phosphor materials, optical reflectors, and spontaneous recombination in resonant-cavity structures are discussed in detail. With exercises, solutions, and illustrative examples, this textbook will be of interest to scientists and engineers working on LEDs and graduate students in electrical engineering, applied physics, and materials science.
Author | : C. R. Ronda |
Publisher | : The Electrochemical Society |
Total Pages | : 238 |
Release | : 2000 |
Genre | : Electrochemistry |
ISBN | : 9781566772631 |
Download Physics and Chemistry of Luminescent Materials Book in PDF, ePub and Kindle
Author | : Keith H. Butler |
Publisher | : Penn State University Press |
Total Pages | : 376 |
Release | : 1980 |
Genre | : Science |
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Download Fluorescent Lamp Phosphors Book in PDF, ePub and Kindle
This comprehensive treatment of fluorescent lamp phosphors is the first published description of methods for their manufacture. It discusses the various factors controlling the selection of specific phosphors for use in lamps, and is unique in its systematic application of group theory to the problem of explaining the excitation and emission spectra in terms of crystal structure of the host material and the energy levels of the added foreign ions which are the so-called activators responsible for fluorescence. Unusual topics from various specialized fields are included since phosphor science requires a knowledge of several branches of physics, chemistry, and crystallography as well as some aspects of ceramic technology. The basic principles of the theory of atomic spectra, group theory, and the use of character tables for the thirty-two crystallographic point groups are included for convenient reference. The appendix contains essential tables for dealing with the spectra of ions in crystals.
Author | : Alok Srivastava |
Publisher | : |
Total Pages | : 38 |
Release | : 2003 |
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Download NEXT GENERATION ENERGY EFFICIENT FLUORESCENT LIGHTING PRODUCT. Book in PDF, ePub and Kindle
This is the Final Report of the Next-Generation Energy Efficient Fluorescent Lighting Products program, Department of Energy (DOE). The overall goal of this three-year program was to develop novel phosphors to improve the color rendition and efficiency of compact and linear fluorescent lamps. The prime technical approach was the development of quantum-splitting phosphor (QSP) to further increase the efficiency of conventional linear fluorescent lamps and the development of new high color rendering phosphor blends for compact fluorescent lamps (CFLs) as potential replacements for the energy-hungry and short-lived incandescent lamps in market segments that demand high color rendering light sources. We determined early in the project that the previously developed oxide QSP, SrAl{sub 12}O{sub 19}:Pr{sup 3+}, did not exhibit an quantum efficiency higher than unity under excitation by 185 nm radiation, and we therefore worked to determine the physical reasons for this observation. From our investigations we concluded that the achievement of quantum efficiency exceeding unity in SrAl{sub 12}O{sub 19}:Pr{sup 3+} was not possible due to interaction of the Pr{sup 3+} 5d level with the conduction band of the solid. The interaction which gives rise to an additional nonradiative decay path for the excitation energy is responsible for the low quantum efficiency of the phosphor. Our work has led to the development of a novel spectroscopic method for determining photoionzation threshold of luminescent centers in solids. This has resulted in further quantification of the requirements for host phosphor lattice materials to optimize quantum efficiency. Because of the low quantum efficiency of the QSP, we were unable to demonstrate a linear fluorescent lamp with overall performance exceeding that of existing mercury-based fluorescent lamps. Our work on the high color rendering CFLs has been very successful. We have demonstrated CFLs that satisfies the EnergyStar requirement with color rendering index (CRI) greater than 90; the CRI of current commercial CFLs are in the low 80s. In this report we summarize the technical work completed under the Program, summarize our findings about the performance limits of the various technologies we investigated, and outline promising paths for future work.