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

Synthesis and Luminescence Properties of Rare Earth Activated Phosphors for Near UV-emitting LEDs for Efficacious Generation of White Light
Author: Jinkyu Han
Publisher:
Total Pages: 203
Release: 2013
Genre:
ISBN: 9781267908490
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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.

Rare-Earth-Activated Phosphors

Rare-Earth-Activated Phosphors
Author: Vikas Dubey
Publisher: Elsevier
Total Pages: 410
Release: 2022-06-29
Genre: Science
ISBN: 0323886051
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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

New Generation of Europium- and Terbium-Activated Phosphors

New Generation of Europium- and Terbium-Activated Phosphors
Author: Mihail Nazarov
Publisher: CRC Press
Total Pages: 458
Release: 2011-09-02
Genre: Science
ISBN: 9814364053
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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

Luminescence

Luminescence
Author: Ratnesh Tiwari
Publisher: Walter de Gruyter GmbH & Co KG
Total Pages: 332
Release: 2021-12-20
Genre: Science
ISBN: 3110676516
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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.

2D Materials for Photonic and Optoelectronic Applications

2D Materials for Photonic and Optoelectronic Applications
Author: Qiaoliang Bao
Publisher: Woodhead Publishing
Total Pages: 336
Release: 2019-10-19
Genre: Science
ISBN: 0128154357
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2D Materials for Photonic and Optoelectronic Applications introduces readers to two-dimensional materials and their properties (optical, electronic, spin and plasmonic), various methods of synthesis, and possible applications, with a strong focus on novel findings and technological challenges. The two-dimensional materials reviewed include hexagonal boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, black phosphorous and other novel materials. This book will be ideal for students and researchers in materials science, photonics, electronics, nanotechnology and condensed matter physics and chemistry, providing background for both junior investigators and timely reviews for seasoned researchers. Provides an in-depth look at boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, and more Reviews key applications for photonics and optoelectronics, including photodetectors, optical signal processing, light-emitting diodes and photovoltaics Addresses key technological challenges for the realization of optoelectronic applications and comments on future solutions

Phosphors

Phosphors
Author: Sanjay J. Dhoble
Publisher: CRC Press
Total Pages: 382
Release: 2018-05-11
Genre: Science
ISBN: 0429865376
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Rare earth–doped luminescent materials play an integral role in modern life because of their tremendous applications ranging from scintillators, color displays, fluorescent lamps, and intensifying screens to dosimetry of ionizing radiations. Written and edited by prominent luminescence researchers, this book details cutting-edge research on luminescence materials and is illustrated throughout with excellent figures and references. It will appeal to anyone involved in luminescence research and its applications, especially advanced undergraduate-, graduate-, and postgraduate-level students of spectroscopy, solid state physics, luminescence, material synthesis, and optical properties and researchers working on the synthesis of optical materials, the characterization of luminescence materials, solid state lighting, radiation dosimetry luminescence, and phosphor applications.

Hybrid Phosphor Materials

Hybrid Phosphor Materials
Author: Kanchan Upadhyay
Publisher: Springer Nature
Total Pages: 358
Release: 2022-01-12
Genre: Technology & Engineering
ISBN: 3030905063
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This book reports the basics of hybrid phosphor materials, their synthesis routes and their special properties and characterization techniques. It gives the reader information about the natural origins and development of hybrid materials, which are developed by combining inorganic and organic species in one material interface-determined materials. The book provides a general classification of hybrid materials, wherein inorganic materials modified by organic moieties are distinguished from organic materials or matrices modified by inorganic constituents. It gives a focus to the functionalization of organic materials by inorganic additives. The application areas covered include optoelectronic field, sensor applications, biological and environmental applications.

Nitride Phosphors and Solid-State Lighting

Nitride Phosphors and Solid-State Lighting
Author: Rong-Jun Xie
Publisher: CRC Press
Total Pages: 332
Release: 2016-04-19
Genre: Science
ISBN: 1439830126
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Nitride Phosphors and Solid-State Lighting provides an in-depth introduction to the crystal chemistry, synthesis, luminescence, and applications of phosphor materials for solid-state lighting, mainly focusing on new nitride phosphors. Drawing on their extensive experimental work, the authors offer a multidisciplinary study of phosphor materials tha

Red phosphors for W-LED applications

Red phosphors for W-LED applications
Author: John Peter
Publisher: GRIN Verlag
Total Pages: 22
Release: 2015-09-09
Genre: Science
ISBN: 3668043043
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Project Report from the year 2015 in the subject Physics - Optics, ST Anne's College Of Engineering And Technology (St. Anne’s College of Engineering and Technology, Panruti, Tamilnadu, India), language: English, abstract: Trivalent rare-earth-ion-activated molybdate based phosphors have attracted great attention for solid-state lighting applications by virtue of their long lifetimes, and efficient luminescence property. The rare-earth ions are represented by a partly filled 4f shell that is completely shielded by 5s2 and 5p6 orbitals. Therefore, emission transitions provide sharp intense lines in the optical spectra [1, 2]. The use of rare-earth element-based phosphor, based on ‘‘line-type’’ f–f transitions, can narrow the emissions to the visible range, resulting in high efficiency and a high-lumen equivalence. In recent years, a flourishing care is concentrated on Li3Ba2Gd3-x(MoO4)8 host matrix for luminescent ions in the interest of their excellent chemical and thermal stability and favourable luminescence characteristics compared to the sulfide- and nitride-based materials. Moreover, these are environmentally friendly as no toxic gases like sulphide are given out. Li3Ba2Gd3-x(MoO4)8 occur in monoclinic crystal system with space group C2/c in a disordered structure [3]. For this research paper, a series of Li3Ba2Gd3–xPrx (MoO4)8 (x = 0.01, 0.03, 0.05, 0.07and 0.09 mol) and Li3Ba2Gd3–xSmx (MoO4)8 (x = 0.02, 0.04, 0.06, 0.08 and 0.10 mol) red phosphors were synthesized by conventional solid state reaction method.

Phosphor Handbook

Phosphor Handbook
Author: Shigeo(decease) Shionoya
Publisher: CRC Press
Total Pages: 940
Release: 1998-09-10
Genre: Science
ISBN: 9780849375606
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From basic principles of luminescence to innovative technical applications, Phosphor Handbook will serve as the definitive resource on phosphors. Considering all the major changes in the field of phosphors, the editors have produced the most current and comprehensive reference available today. Contributed by noted worldwide scientists and engineers, the handbook serves a ready audience among researchers in the field of luminescence. This book completely describes: powder phosphors, including information on solid state laser materials and organic EL properties and technical applications of phosphors, including the principal classes of phosphors, procedures to synthesize and manufacture these phosphors, manner of deployment, and materials that emit light under various kinds of excitation current developments of phosphor materials required in advanced display technologies, such as UV Plasma Display and Field Emission Display (FED) experimental techniques characterizing materials in their initial and final forms Other provisos include: tutorials of fundamental physical and chemical properties of phosphor materials descriptions of optical properties of phosphor materials profiles on methods of synthesis and manufacture of all practical phosphors analysis of experimental procedures for the optical characterization of raw phosphors and the creation of display devices or lamps specification of physical and optical requirements for all applications of phosphors in lighting and display technologies Japanese industry has and will continue to play a key role in developing these applications, and many contributors to this volume acted as principals in the progress discussed. Display technologies will increase in importance, and no cohesive or comprehensive treatise exists - from basic to applied - on the nature, properties, synthesis, characterization, manufacture, and handling of phosphor materials in lighting and display technologies and applications. This exceptional handbook rectifies this deficiency, serving as the defining resource for all those engaged in research or in the application of phosphor materials - regardless of whether they are newcomers or veterans in this endeavor.