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Light Sources
Published in Toru Yoshizawa, Handbook of Optical Metrology, 2015
Triboluminescence is the light generated via the breaking of asymmetrical bonds in a crystal when that material is scratched, crushed, or rubbed (from the Greek tribein “to rub”). For example, many minerals, such as quartz, glow when scratched; sucrose emits a blue light when crushed; and a diamond may begin to glow while being sawn during the cutting process or a facet is being ground. Diamonds may fluoresce blue or red. The mechanism of triboluminescence is not fully understood yet, but the research in this area suggests that charge is separated upon fracture of asymmetrical materials and when the charges recombine, the electric discharge ionizes the surrounding air, causing a flash of light [82].
Introduction to Borate Phosphors
Published in S. K. Omanwar, R. P. Sonekar, N. S. Bajaj, Borate Phosphors, 2022
Pritee K. Tawalare, A. B. Gawande
A large number of inorganic and organic materials subjected to mechanical stress emit light, which is called triboluminescence. It has also been named mechanoluminescence by some authors. The spectra of triboluminescence light are similar to those of photoluminescence in many substances.
0 Introduction
Published in J.-P. Celis, P. Ponthiaux, Testing tribocorrosion of passivating materials supporting research and industrial innovation: Handbook, 2017
Jean-Pierre Celis, Pierre Ponthiaux
Triboluminescence is the physical phenomenon related to the property of certain crystalline materials to produce light under the action of rubbing, crushing or fracture. This phenomenon occurs in particular on materials or oxides doped with rare earth elements.
Investigation of good dopant (Sm, Cu, Tb, Mn, Sb) for radiation dosimetry in the γ-excited GdCa4O(BO3)3phosphor: mechanoluminescence study
Published in Radiation Effects and Defects in Solids, 2022
G. C. Mishra, Upendra K. Verma, S. J. Dhoble
The phenomenon of mechanoluminescence (ML) conjointly called piezo, fracto and triboluminescence (1–9) has generated wide-ranging analysis interest in recent years owing to its potential application for damage detection, self-diagnosis, optical stress sensors for recording defects and damages, fuse system for army warheads, time visualizations of stress distribution in solids, stress field close to crack-tip, and additionally for developing a safety-monitoring network system, foretelling of the associate earthquake, to detect sudden fracture of ceramic construction. Almost five-hundredths of crystal multifarious exhibit a range of ML (10–19).
The radiation shielding offered by the commercial glass installed in Bangladeshi dwellings
Published in Radiation Effects and Defects in Solids, 2018
Sabina Yasmin, Z. Siti Rozaila, Mayeen Uddin Khandaker, Bijoy Sonker Barua, Faruque-Uz-Zaman Chowdhury, Md. Abdur Rashid, David A Bradley
In regard to TL dosimetry, use has been made of a TLD reader located at the University of Malaya. The glass samples were crushed to powder form using a mortar and pestle and filtered through a 0.18-micrometer sieve. Each type of sample was weighed using an electronic balance to normalise each measurement point to unit mass. The samples were kept in an alumina container covered with black paper to prevent indoor light exposure. Before irradiation the samples were annealed in an oven (Lindberg/Blue M, USA) at 400°C for a period of 1 h to ensure complete removal of any prior history of stored TL, then slowly cooled to room temperature. TLD-100 chips were also annealed for 1 h at 400°C and subsequently 2 h at 100°C to remove all residual TL signal. For energy response the powdered samples and standard TLD-100 chips were exposed using an ERESCO model 200 MF4-RW X-ray machine, with inherent filtration of 0.8 ± 0.1 mm Be window (25) as well as a 60Co irradiator, both machines being located at the Physics department of University of Malaya. A dose of 1 Gy was given to all samples for the energy response study. For dose response a dose range of 10–50 Gy was used as delivered using the 60Co irradiator. The irradiated samples were read out under identical conditions using a Harshaw 3500TL reader under nitrogen (N2) gas atmosphere to eliminate spurious light signals from triboluminescence. The following parameters were used during TL measurement: preheat temperature of 50°C for 10 s, acquisition temperature 300°C and heating rate at 25°C/s. Finally, the annealing temperature was set at 300°C for 10 s to eliminate any residual signal. The Harshaw 3500 TL reader is supported with WinREMS software in order to obtain the dose values. The luminescence intensity produced by heating the sample inside the TLD reader is directly proportional to the absorbed dose of radiation.
1,3-Dimethyl-2-phenyl-1,3-diazaphospholidine-2-oxide as ligand for the preparation of luminescent lanthanide complexes
Published in Journal of Coordination Chemistry, 2019
Marco Bortoluzzi, Alberto Gobbo
Hexamethylphosphoramide (hmpa) is another simple molecule able to coordinate trivalent lanthanide ions [27–42]. Nitrato complexes of Eu(III) with hmpa exhibit triboluminescence [43–45] and the luminescence of Tb(III) and Gd(III) nitrato complexes with hmpa and dibenzoylmethanate was studied [46]. The complexes [Ln(depma)(NO3)3(hmpa)2] (depma = 9-diethylphosphono-methylanthracene; Ln = Dy, Gd) are recent examples of magneto-optic materials [47].