Download or read book Applications of Thermoluminescence to Chromium doped Lithium Germanate written by Albert D. Johnson and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several features of thermoluminescence from chromium-doped lithium germanate were explored. These included: thermoluminescence excitation and emission spectra, thermal activation energies, recombination kinetics, behavior of glow curves as a function of sample temperature-during-excitation, and thermal bleach after excitation. Strong thermoluminescence was obtained by exciting electrons to energies above the U- and Y-absorption bands, and very weak thermoluminescence by exciting to these bands. Thermoluminescence emission occurred in the same wavelength region as fluorescence. Activation energies ranged from 0.17 to 2.3 eV. Thermoluminescence was found to be a sensitive function of temperature-during-excitation; large increases in high-temperature peaks were accompanied by small decreases in low-temperature glow peaks. Thermal bleaching after excitation, however, left high temperature peaks unchanged, while low-temperature peaks were removed. (Author).

Download or read book Applications of Thermoluminescence to Chromium doped Lithium Germanate written by Albert D. Johnson and published by . This book was released on 1969 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several features of thermoluminescence from chromium-doped lithium germanate were explored. These included: thermoluminescence excitation and emission spectra, thermal activation energies, recombination kinetics, behavior of glow curves as a function of sample temperature-during-excitation, and thermal bleach after excitation. Strong thermoluminescence was obtained by exciting electrons to energies above the U- and Y-absorption bands, and very weak thermoluminescence by exciting to these bands. Thermoluminescence emission occurred in the same wavelength region as fluorescence. Activation energies ranged from 0.17 to 2.3 eV. Thermoluminescence was found to be a sensitive function of temperature-during-excitation; large increases in high-temperature peaks were accompanied by small decreases in low-temperature glow peaks. Thermal bleaching after excitation, however, left high temperature peaks unchanged, while low-temperature peaks were removed. (Author)

Download or read book Spectroscopic Considerations of Chromium Doped Lithium Germanate as a Possible Laser Material written by Richard Conger Powell and published by . This book was released on 1968 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous fluorescence, pulsed fluorescence, and excitation measurements were made on lithium germanate samples containing 0. 038, 0. 12, and 0. 18 percent chromium. The several sharp lines appearing in the fluorescence spectrum are attributed to chromium ions in nonequivalent lattice sites. It appears that these sites are filled randomly as chromium concentration is increased. The temperature dependence of the widths, positions, intensites, and lifetimes were investigated for the two most prominent sets of R lines associated with chromium in nonequivalent sites. These results are interpreted in terms of energy transfer between chromium ions in nonequivalent sites, which is efficient enough at high temperatures to allow thermal equilibrium to be established between the two florescent systems but which predicts pumping of the R system by the R' system at low temperatures. (Author).

Download or read book Spectroscopic Considerations of Chromium Doped Lithium Germanate as a Possible Laser Material written by Richard C. Powell and published by . This book was released on 1968 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous fluorescence, pulsed fluorescence, and excitation measurements were made on lithium germanate samples containing 0. 038, 0. 12, and 0. 18 percent chromium. The several sharp lines appearing in the fluorescence spectrum are attributed to chromium ions in nonequivalent lattice sites. It appears that these sites are filled randomly as chromium concentration is increased. The temperature dependence of the widths, positions, intensites, and lifetimes were investigated for the two most prominent sets of R lines associated with chromium in nonequivalent sites. These results are interpreted in terms of energy transfer between chromium ions in nonequivalent sites, which is efficient enough at high temperatures to allow thermal equilibrium to be established between the two florescent systems but which predicts pumping of the R system by the R' system at low temperatures. (Author).

Download or read book Report on Research at AFCRL written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1970 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1969 with total page 1502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1969-10 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of AFCRL Publications from 1 April to 30 June 1969 written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1969 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bibliography lists all AFCRL in-house reports, journal articles, and contractor reports issued from 1 April to 30 June 1969.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1969 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research and Development Reports Index written by and published by . This book was released on 1969 with total page 1306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research and Development Reports written by and published by . This book was released on 1969 with total page 1214 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Index written by and published by . This book was released on 1969 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements written by and published by . This book was released on 1969 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1969 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Scientific and Industrial Reports written by and published by . This book was released on 1969 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Persistent Phosphors written by Jianrong Qiu and published by Woodhead Publishing. This book was released on 2020-11-24 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Persistent Phosphors: From Fundamentals to Applications provides an introduction to the key synthesis methods, characterization methods, physical mechanisms, and applications of this important luminescent materials system. The book covers basic persistent phosphorescence, introducing concepts such as emission, luminescence, phosphorescence, persistent phosphorescence and the development of persistent phosphors. Then, synthesis methods are reviewed and the connections between synthesis methods and improved materials properties are discussed. Characterization methods to investigate the trapping and de-trapping mechanism are also presented. Other sections cover the theoretical framework and energy band engineering models and materials with a focus on activators, hosts, emission bands and excitation bands. Finally, the most relevant applications of persistent phosphors are included for use in displays, safety signs, bio-labels and energy. Persistent Phosphors is an invaluable reference for materials scientists and engineers in academia and R&D. It is a key resource for chemists and physicists. Presents characterization techniques to reveal the photophysical and photochemical properties of defects for this important category of luminescent materials Discusses the structural role of defects in polycrystals and the capture-storing-migration-release progress of excited carriers Demonstrates the synthesis routes and potential applications for persistent phosphor materials

Download or read book Ceramics Glass and Glass Ceramics written by Francesco Baino and published by Springer Nature. This book was released on 2021-10-22 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a state-of-the-art overview of the major aspects involved in the science, technology and applications of ceramics, glasses and glass-ceramics. After providing an historical perspective of the development and use of ceramics and glasses along the Silk Road, the theoretical background and fabrication techniques of such materials are described and discussed. A special focus is dedicated to emerging high-tech applications in various fields, including medicine, energy, optics and photonics, sensors, sustainability and circular economy. The chapters are written by leading experts in their respective fields and highlight the contemporary challenges associated to each topic. This book will serve as a valuable reference for both early-stage and skilled researchers as well as industry professionals interested in the broad field of glasses and ceramics.