Investigation of Whitlockite Structured Inorganic Phosphate Phosphor for Solid-State Lighting Applications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Investigation of Whitlockite Structured Inorganic Phosphate Phosphor for Solid-State Lighting Applications write by Obert Pradipta Golim. This book was released on 2019. Investigation of Whitlockite Structured Inorganic Phosphate Phosphor for Solid-State Lighting Applications available in PDF, EPUB and Kindle. Phosphor converted white LEDs have been regarded as a reliable solid-state lighting source. Studies over the past few years have shown an increase in the development of phosphate-based phosphors, where whitlockite-structured phosphors have attracted intensive attention. In this research, the Ca9MgLi(PO4)7-based compounds activated with Pr3+/ Eu2+/Dy3+ have been investigated as a potential candidate of phosphors. The phosphor materials were synthesised through the conventional solid-state reaction method. A detailed investigation of the structure was carried out using high-resolution neutron and X-ray diffraction. Results show that the compound was comprised of 5 anionic sites. The M1, M2, and M3 sites were identified to be fully occupied with the Ca2+ and their respective activator. The M4 site was discovered to be occupied with Li+ and Mg2+, while M5 site was occupied with Ca2+ and Mg2+. The refinement results and compositional analysis using EDS shows the synthesised phosphor has a final composition that is close to the proposed formula of Ca9MgLi(PO4)7. The photoluminescence investigation on Eu2+ activated phosphors revealed that the specific phosphor has the emission peak of 412 nm under the excitation of 279 nm, which is not suitable for lighting applications. However, it indicates that the activator has three preferential sites in M2, M1, and M3, respectively. Further investigation has revealed that Pr3+ and Dy3+ have the potential for solid-state lighting applications with good thermal stability.
Phosphate Phosphors for Solid-State Lighting
Phosphate Phosphors for Solid-State Lighting - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Phosphate Phosphors for Solid-State Lighting write by Kartik N. Shinde. This book was released on 2012-12-15. Phosphate Phosphors for Solid-State Lighting available in PDF, EPUB and Kindle. The idea for this book arose out of the realization that, although excellent surveys and a phosphor handbook are available, there is no single source covering the area of phosphate based phosphors especially for lamp industry. Moreover, as this field gets only limited attention in most general books on luminescence, there is a clear need for a book in which attention is specifically directed toward this rapidly growing field of solid state lighting and its many applications. This book is aimed at providing a sound introduction to the synthesis and optical characterization of phosphate phosphor for undergraduate and graduate students as well as teachers and researchers. The book provides guidance through the multidisciplinary field of solid state lighting specially phosphate phosphors for beginners, scientists and engineers from universities, research organizations, and especially industry. In order to make it useful for a wide audience, both fundamentals and applications are discussed, together.
Optical Properties of Phosphate and Pyrophosphate Compounds
Optical Properties of Phosphate and Pyrophosphate Compounds - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Optical Properties of Phosphate and Pyrophosphate Compounds write by Ritesh L. Kohale. This book was released on 2020-12-05. Optical Properties of Phosphate and Pyrophosphate Compounds available in PDF, EPUB and Kindle. An in-depth look at the luminescence of phosphor materials for applications in optical devices, sensors, and medical technologies. Optical Properties of Phosphate and Pyrophosphate Compounds gives a broad introduction to pyrophosphates and phosphate-based phosphors, including their fundamental properties, material composition, synthesis methods, characterization techniques, and applications in optical devices and technologies. The text describes the development of the materials’ shape and size, as well as crucial characterization techniques for key applications. Additionally, it includes essential information about recently used single and mixed cations pyrophosphate and phosphate compounds. This book is suitable for researchers working in materials science, engineering, materials chemistry, and physics. It may also be helpful to engineers and chemists working in R&D for solid state lighting. Includes comprehensive review of materials synthesis and characterization techniques for pyrophosphate and phosphate-based phosphor materials for key applications Discusses the fundamentals of luminescence and the optical properties of pyrophosphate and phosphate-based phosphor material Addresses key applications in optical devices, sensors, and medical technologies
Phosphors
Phosphors - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Phosphors write by Sanjay J. Dhoble. This book was released on 2018-05-11. Phosphors available in PDF, EPUB and Kindle. 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.
Novel Phosphors for Solid State Lighting
Novel Phosphors for Solid State Lighting - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Novel Phosphors for Solid State Lighting write by Joshua D. Furman. This book was released on 2010. Novel Phosphors for Solid State Lighting available in PDF, EPUB and Kindle. Solid state white light emitting diode lighting devices outperform conventional light sources in terms of lifetime, durability, and lumens per watt. However, the capital contribution is still to high to encourage widespread adoption. Furthermore, the colour from today's devices is unsuitable for general room illumination and thus new phosphor materials are needed. This dissertation will examine the synthesis of inorganic nanoparticles and the possibility of using hybrid inorganic-organic frameworks in the search for new lighting phosphors. Nanoparticles of the oxide compound yttrium aluminium garnet were synthesized using an emulsion technique, though it was found that the high temperature processing needed for good optical properties was not compatible with maintaining nanosized particles. In terms of hybrid framework phosphors, several aspects of this new area have been explored. The mechanical and optical properties of a dense cerium oxalate formate hybrid framework compound have been investigated. Its strength was found to be nearly as great as some classical ceramic compounds, and clearly robust enough for device applications. While the photoluminescence of the cerium oxalate formate was not suitable for solid state lighting, the impressive mechanical properties evaluated are expected to be valid for a wide range of dense inorganic-organic frameworks. A novel approach to solid state lighting phosphors was introduced by using ligand-based photoluminescence in hybrid frameworks. Novel frameworks were prepared using 9,10-anthraquinone-2,3-dicarboxylic acid in combination with calcium, manganese, nickel, and zinc. These compounds show excellent photoluminescent emission for use in solid state lighting applications, although the luminescence is quenched at room temperature due to dynamic effects. The excitation, while reaching the blue part of the spectrum, falls just short of what is needed for use today's devices. To address these issues, a second class of novel framework compounds was prepared using 9-fluorenone-2,7-dicarboxylic acid in combination with calcium, strontium, barium, cadmium, and manganese. They are more rigid structures and show good luminescence at room temperature with a photoluminescent excitation spectrum extending further into the blue than the anthraquinones. Additionally, quantum yield in the calcium fluorenone is nearly double that of its parent ligand, suggesting that there is an enhancement in luminescent properties as a result its inclusion in a framework structure. An explanation for the differences in efficiency between seemingly similar compounds are drawn from their compositions, crystal structures, photoluminescence, and specific heat properties. Finally, some structural and chemical targets for future hybrid phosphor development are identified based on the relationships identified in this work.
