Rare Earth Activated Phosphors

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Rare-Earth-Activated Phosphors

Author : Vikas Dubey
Publisher : Elsevier
ISBN 13 : 0323886051
Total Pages : 410 pages
Book Rating : 4.3/5 (238 download)

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Book Synopsis Rare-Earth-Activated Phosphors by : Vikas Dubey

Download or read book Rare-Earth-Activated Phosphors written by Vikas Dubey and published by Elsevier. This book was released on 2022-06-29 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rare-Earth-Activated Phosphors: Chemistry and Applications outlines important fundamentals and properties and explores successful application that address key problems across the sciences. Sections introduce phosphors and luminescence, explore their properties, characteristics, synthesis and degradation and highlight key applications across telecommunications, lighting, electroluminescent devices, (bio-)analytical sensors, bio-imaging set-ups, drug delivery and sustainable energy devices. Drawing on the knowledge of an expert team of contributors, the book provides useful insight into successfully harnessing the properties of rare earth activated phosphors for a range of important applications. Rare-earth nano-phosphors offer an interesting array of characteristics, including sharp emission bands, exceptional optical damage thresholds, low toxicity, high selectivity and stability, and long luminescence lifetimes. Understanding these properties can help researchers effectively manipulate them for a range of important applications. Provides a good introduction to the useful properties and characteristics of rare earth activated phosphors Analyzes the use of rare earth activated phosphors for a broad variety of important applications, bridging the gap between theory and application Encourages further discourse and development for improving the energy-efficiency of devices based on rare earth activated phosphors

Luminescence

Author : Ratnesh Tiwari
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110676451
Total Pages : 258 pages
Book Rating : 4.1/5 (16 download)

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Book Synopsis Luminescence by : Ratnesh Tiwari

Download or read book Luminescence written by Ratnesh Tiwari and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-12-20 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphors are often consisting of transition-metal compounds or rare-earth compounds, with the most common application being displays and fluorescent light. This book will guide the reader through the latest developments in thermo-, electro-, mechano- and bioluminescence of rare earth phosphors and crystals. Also, the effect of doping will be discussed.

New Generation of Europium- and Terbium-Activated Phosphors

Author : Mihail Nazarov
Publisher : CRC Press
ISBN 13 : 9814310778
Total Pages : 468 pages
Book Rating : 4.8/5 (143 download)

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Book Synopsis New Generation of Europium- and Terbium-Activated Phosphors by : Mihail Nazarov

Download or read book New Generation of Europium- and Terbium-Activated Phosphors written by Mihail Nazarov and published by CRC Press. This book was released on 2011-09-02 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book concentrates on the luminescence and structural properties of the new generation of europium and terbium activated phosphors, associated phenomena, and related topics, from basic principles to the most recent discoveries. It summarizes the present state of the art in this rapidly growing field. The authors describe recent developments in the areas of rare earth doped phosphors and of some new materials or well-known materials with improved properties that open up new possibilities. The areas of focus include X-ray phosphors, phosphors for light-emitting devices, emissive displays, and fluorescent lamps. The book comprises theoretical and experimental analysis of various properties of phosphors, research methods and preparation techniques, and some promising applications.

New Generation of Europium- and Terbium-Activated Phosphors

Author : Mihail Nazarov
Publisher : CRC Press
ISBN 13 : 9814364053
Total Pages : 458 pages
Book Rating : 4.8/5 (143 download)

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Book Synopsis New Generation of Europium- and Terbium-Activated Phosphors by : Mihail Nazarov

Mechanisms Affecting Emission in Rare-earth-activated Phosphors

Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Mechanisms Affecting Emission in Rare-earth-activated Phosphors by :

Download or read book Mechanisms Affecting Emission in Rare-earth-activated Phosphors written by and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relatively poor efficiency of phosphor materials in cathodoluminescence with low accelerating voltages is a major concern in the design of field emission flat panel displays operated below 5 kV. The authors research on rare-earth-activated phosphors indicates that mechanisms involving interactions of excited activators have a significant impact on phosphor efficiency. Persistence measurements in photoluminescence (PL) and cathodoluminescence (CL) show significant deviations from the sequential relaxation model. This model assumes that higher excited manifolds in an activator de-excite primarily by phonon-mediated sequential relaxation to lower energy manifolds in the same activator ion. In addition to sequential relaxation, there appears to be strong coupling between activators, which results in energy transfer interactions. Some of these interactions negatively impact phosphor efficiency by nonradiatively de-exciting activators. Increasing activator concentration enhances these interactions. The net effect is a significant degradation in phosphor efficiency at useful activator concentrations, which is exaggerated when low-energy electron beams are used to excite the emission.

Rare Earth Activated Gedelonium Oxide Nanophosphors

Author : Dr. B. M. Manohara
Publisher : Nitya Publications
ISBN 13 : 8194550491
Total Pages : 177 pages
Book Rating : 4.1/5 (945 download)

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Book Synopsis Rare Earth Activated Gedelonium Oxide Nanophosphors by : Dr. B. M. Manohara

Download or read book Rare Earth Activated Gedelonium Oxide Nanophosphors written by Dr. B. M. Manohara and published by Nitya Publications. This book was released on 2020-01-01 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphor materials find wide applications ranging from fluorescent display to luminescence immunoassay. These materials essentially convert one type of energy in to visible radiation and hence, phosphor materials are called optical transducer. They are generally crystalline in nature. Phosphors with high quantum efficiency, effective excitation and absorption, colour parity, longer ifetime and lower cost, as well as better morphology are required. Surface properties have important function for hosphors.Spherical phosphors are optimum morphology in application. The spherical particles are easy to be packed density so that the screen and display can obtain high definition. In addition the dense packed small particles can prevent phosphors from aging.

Synthesis and Photoluminescent Properties of Rare Earth Activated Nitride Phosphors

Author : Jesse C. Reiherzer
Publisher :
ISBN 13 :
Total Pages : 342 pages
Book Rating : 4.:/5 (69 download)

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Book Synopsis Synthesis and Photoluminescent Properties of Rare Earth Activated Nitride Phosphors by : Jesse C. Reiherzer

Download or read book Synthesis and Photoluminescent Properties of Rare Earth Activated Nitride Phosphors written by Jesse C. Reiherzer and published by . This book was released on 2009 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Luminescence Investigation of Rare Earth Activated Silcates Phosphors

Author : Kokode N S
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659751639
Total Pages : 60 pages
Book Rating : 4.7/5 (516 download)

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Book Synopsis Luminescence Investigation of Rare Earth Activated Silcates Phosphors by : Kokode N S

Download or read book Luminescence Investigation of Rare Earth Activated Silcates Phosphors written by Kokode N S and published by LAP Lambert Academic Publishing. This book was released on 2015-06-30 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in field of luminescent materials show the lot of interest in this area.The silicates are the largest, the most interesting and the most complicated class of minerals than any other minerals. Silicate materials are useful in may applications of technological importance. In the present work photo luminescence investigation of rare earth activated silicate based phosphor were studied.

Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for Near UV-emitting LEDs for Efficacious Generation of White Light

Download Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for Near UV-emitting LEDs for Efficacious Generation of White Light PDF Online Free

Author : Jinkyu Han
Publisher :
ISBN 13 : 9781267908490
Total Pages : 203 pages
Book Rating : 4.9/5 (84 download)

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Book Synopsis Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for Near UV-emitting LEDs for Efficacious Generation of White Light by : Jinkyu Han

Download or read book Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for Near UV-emitting LEDs for Efficacious Generation of White Light written by Jinkyu Han and published by . This book was released on 2013 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state white-emitting lighting devices based on LEDs outperform conventional light sources in terms of lifetime, durability, and luminous efficiency. Near UV-LEDs in combination with blue-, green-, and red-emitting phosphors show superior luminescence properties over the commercialized blue-emitting LED with yellow-emitting phosphors. However, phosphor development for near UV LEDs is a challenging problem and a vibrant area of research. In addition, using the proper synthesis technique is an important consideration in the development of phosphors. In this research, efficient blue-, green-yellow, red-emitting, and color tunable phosphors for near UV LEDs based white light are identified and prepared by various synthetic methods such as solid state reaction, sol-gel/Pechini, co-precipitation, hydrothermal, combustion and spray-pyrolysis. Blue-emittingLiCaPO4:Eu2, Green/yellow-emitting (Ba, Sr)2SiO4:Eu2, color tunable solid solutions of KSrPO4−(Ba, Ca)2SiO4:Eu2+, and red-emitting (Ba, Sr, Ca)3MgSi2O:Eu2+, Mn2+ show excellent excitation profile in the near UV region, high quantum efficiency, and good thermal stability for use in solid state lighting applications. In addition, different synthesis methods are analyzed and compared, with the goal of obtaining ideal phosphors, which should have not only have high luminous output but also optimal particle size (~150 - 400 nm) and spherical morphology. For Sr2SiO4:Eu2+, the sol-gel method appears to be the best method. For Ba2SiO4:Eu2+, the co-precipitation method is be the best. Lastly, the fabrication of core/SiO2 shell particles alleviate surface defects and improve luminescence output and moisture stability of nano and micron sized phosphors. For nano-sized Y2O3:Eu3+, Y2SiO5:Ce3+, Tb3+, and (Ba, Sr)2SiO4, the luminescence emission intensity of the core/shell particles were significantly higher than that of bare cores. Additionally, the moisture stability is also improved by SiO2 shells, the luminescence output of SiO2 coated green emitting Ca3SiO4Cl2:Eu2+ and blue emitting Ca2PO4Cl:Eu2+ phosphors is comparable to that of fresh phosphors although bare phosphors shows significant luminescence quenching after water exposure.

Phosphors for Energy Saving and Conversion Technology

Author : Vijay B. Pawade
Publisher : CRC Press
ISBN 13 : 0429943229
Total Pages : 213 pages
Book Rating : 4.4/5 (299 download)

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Book Synopsis Phosphors for Energy Saving and Conversion Technology by : Vijay B. Pawade

Download or read book Phosphors for Energy Saving and Conversion Technology written by Vijay B. Pawade and published by CRC Press. This book was released on 2018-09-03 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text deals with the advantages of rare earth activated phosphors for the development of solid state lighting technology and in enhancing the light conversion efficiency of Si solar cells. The book initiates with a short overview of the atomic and semiconductor theory followed by introduction to phosphor, its working mechanism, role of rare earth ions in the lighting and PV devices and host materials being used. Further, it introduces the applications of inorganic phosphor for the development of green energy and technology including advantages of UP/DC conversion phosphor layers in the enhancing the cell response of PV devices. Key Features: Focuses on discussion of phosphors for both solid state lighting and photovoltaics applications Provides introduction for practical applications including synthesis and characterization of phosphor materials Includes broad, in-depth introduction of semiconductors and related theory Enhances the basic understanding of optical properties for rare earth phosphors Covers up-conversion and down-conversion phosphor for energy harvesting applications

Rare Earth Activated Phosphors Coating for Photoluminescent Textile

Author : Zhuoming Chen
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.:/5 (973 download)

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Book Synopsis Rare Earth Activated Phosphors Coating for Photoluminescent Textile by : Zhuoming Chen

Download or read book Rare Earth Activated Phosphors Coating for Photoluminescent Textile written by Zhuoming Chen and published by . This book was released on 2016 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results reveal that the synthesized Y2́2O2́3:Eu℗đ1́ð phosphor with favorable photoluminescent properties is a desirable candidate as the evaporated target in the deposition process. The results also indicate that the Y2́2O2́3:Eu℗đ1́ð films deposited onto quartz fabric with a substrate temperature of 2504́3 exhibit optimal photoluminescent intensity after annealing treatment which is improved by 32.67% as opposed to annealed films grown at room temperature. The maximum photoluminescent intensity of the annealed Y2́2O2́3:Eu℗đ1́ð films deposited onto quartz fabric is observed with a deposition time of 15 min, which is improved by 124.73% in comparison to a deposition time of 5 min. The emission brightness is optimal when the annealed films are prepared with a deposition current of 140 mA, and the photoluminescent intensity is increased by 6317% when the deposition current is increased from 80 to 140 mA. Both annealing methods can effectively improve the photoluminescent properties of the Y2́2O2́3:Eu℗đ1́ð films deposited onto quartz fabric. The highest emission brightness of the Y2́2O2́3:Eu℗đ1́ð films deposited onto quartz fabric is obtained after furnace annealing at 10004́3 for 3 h and CO2́2 laser heating with a resolution of 35 dpi for 120 Îơs, and the photoluminescent intensity is improved by 1234.41% and 366.73%, respectively compared to that of the as-deposited films. This study indicates that EBE is a promising technology for the development of photoluminescent textiles. The experimental results suggest that the improved morphology and crystal properties of the Y2́2O2́3:Eu℗đ1́ð films are the major reasons for the increased photoluminescent properties of the deposited quartz fabric. The prepared photoluminescent textile that emits a red light has potential applications for anti-counterfeiting, security warning and decoration purposes.

Luminescence

Author : Cornelis R. Ronda
Publisher : John Wiley & Sons
ISBN 13 : 3527621059
Total Pages : 276 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Luminescence by : Cornelis R. Ronda

Download or read book Luminescence written by Cornelis R. Ronda and published by John Wiley & Sons. This book was released on 2007-11-30 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this, the only up-to-date book on this key technology, the number-one expert in the field perfectly blends academic knowledge and industrial applications. Adopting a didactical approach, Professor Ronda discusses all the underlying principles, such that both researchers as well as beginners in the field will profit from this book. The focus is on the inorganic side and the phenomena of luminescence behind the manifold applications illustrated here, including displays, LEDs, lamps, and medical applications. Valuable reading for chemists and electrochemists, as well as materials scientists, those working in the optical and chemical industry, plus lamp and lighting manufacturers.

Investigation Into the Spectra of Electro- and Photo-luminescent Phosphors Activated by Rare Earth Elements

Author : V. E. Oranovski
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (451 download)

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Book Synopsis Investigation Into the Spectra of Electro- and Photo-luminescent Phosphors Activated by Rare Earth Elements by : V. E. Oranovski

Download or read book Investigation Into the Spectra of Electro- and Photo-luminescent Phosphors Activated by Rare Earth Elements written by V. E. Oranovski and published by . This book was released on 1965 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Rare-earth-activated Group Vi D ̊ Metal Oxides as Thermosensitive Phosphors

Author : Samarage Sameera Prasad Perera
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (123 download)

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Book Synopsis Rare-earth-activated Group Vi D ̊ Metal Oxides as Thermosensitive Phosphors by : Samarage Sameera Prasad Perera

Download or read book Rare-earth-activated Group Vi D ̊ Metal Oxides as Thermosensitive Phosphors written by Samarage Sameera Prasad Perera and published by . This book was released on 2019 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, the importance of coupling rare-earth and transition metal ions to develop dual-emitter phosphors to improve the thermometric sensitivity and exploring new host for thermosensitive phosphors was highlighted.

Phosphor Handbook

Author : Vijay B. Pawade
Publisher : Elsevier
ISBN 13 : 0323906508
Total Pages : 442 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Phosphor Handbook by : Vijay B. Pawade

Download or read book Phosphor Handbook written by Vijay B. Pawade and published by Elsevier. This book was released on 2023-01-15 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phosphor Handbook: Process, Properties and Applications provides a comprehensive overview of the latest advances in research on the synthesis, characterization and applications of organic and inorganic phosphors. There is detailed information presented on the characterization of the relevant phosphor groups, such as up-conversion and down-conversion phosphors, inorganic LED phosphors, organic LED phosphors and thermoluminescence and dosimetric phosphors using various physical and chemical advances. Finally, the advances in phosphor technologies are discussed, including current barriers to their use in commercial applications and emerging opportunities. This book is suitable for researchers and practitioners in academia and those working in R&D in industry in the disciplines of materials science and engineering, materials chemistry, materials physics, photonics science and technology, nanotechnology and physical chemistry. Introduces fundamentals of phosphor materials, including their mechanisms, properties and technologies Reviews the most important categories of phosphor materials (inorganic and organic) for use in light-emitting diodes and dosimetry Discusses advances in physical and chemical methods to synthesize and characterize phosphor materials

Europium-activated Phosphors Containing Oxides of Rare-earth and Group-IIIB Metals and Method of Making the Same

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (958 download)

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Book Synopsis Europium-activated Phosphors Containing Oxides of Rare-earth and Group-IIIB Metals and Method of Making the Same by :

Download or read book Europium-activated Phosphors Containing Oxides of Rare-earth and Group-IIIB Metals and Method of Making the Same written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Europium-activated phosphors comprise oxides of at least a rare-earth metal selected from the group consisting of gadolinium, yttrium, lanthanum, and combinations thereof and at least a Group-IIIB metal selected from the group consisting of aluminum, gallium, indium, and combinations thereof. A method for making such phosphors comprises adding at least a halide of at least one of the selected Group-IIIB metals in a starting mixture. The method further comprises firing the starting mixture in an oxygen-containing atmosphere. The phosphors produced by such a method exhibit improved absorption in the UV wavelength range and improved quantum efficiency.

Phosphors for Energy Saving and Conversion Technology

Author : Vijay B. Pawade
Publisher : CRC Press
ISBN 13 : 0429943237
Total Pages : 238 pages
Book Rating : 4.4/5 (299 download)

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Book Synopsis Phosphors for Energy Saving and Conversion Technology by : Vijay B. Pawade

Download or read book Phosphors for Energy Saving and Conversion Technology written by Vijay B. Pawade and published by CRC Press. This book was released on 2018-09-03 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text deals with the advantages of rare earth activated phosphors for the development of solid state lighting technology and in enhancing the light conversion efficiency of Si solar cells. The book initiates with a short overview of the atomic and semiconductor theory followed by introduction to phosphor, its working mechanism, role of rare earth ions in the lighting and PV devices and host materials being used. Further, it introduces the applications of inorganic phosphor for the development of green energy and technology including advantages of UP/DC conversion phosphor layers in the enhancing the cell response of PV devices. Key Features: Focuses on discussion of phosphors for both solid state lighting and photovoltaics applications Provides introduction for practical applications including synthesis and characterization of phosphor materials Includes broad, in-depth introduction of semiconductors and related theory Enhances the basic understanding of optical properties for rare earth phosphors Covers up-conversion and down-conversion phosphor for energy harvesting applications