As a potential ultrafast scintillator, Cl-doped γ-CuI single crystal was successfully grown in acetonitrile solvent through evaporation technique, and its crystal structure and luminescence characteristics were investigated in detail. The results of photoluminescence and X-ray excited luminescence spectra indicated that the near-band-edge (NBE) emission of the crystal was significantly enhanced, and simultaneously its deep-level (DL) emission was suppressed greatly. And the NBE emission of the crystal exhibited a sub-nanosecond decay time. It is demonstrated that a superior luminescence performance can be expected for Cl-doped γ-CuI crystal by increasing dopant concentration. This work offers a suggestion for optimizing the scintillation properties of the γ-CuI crystal.
Transparent luminescent films have been believed to have the potential applications in high spatial resolution X-ray
imaging system. However, it is usually restricted by the thickness of the film. Instead of alkoxide, GdTaO4:Eu3+ film
with a thickness of about 0.8 μm was prepared from an inorganic salt-2-methoxyethanol solution containing
polyvinylpyrrolidone (PVP) as an additive via single-step spin coating. The whole process was carried out without inert
atmosphere which is necessary for alkoxides. The fired film is optically transparent and crack-free, and exhibits a strong
luminescence at 611 nm under X-ray excitation.
KEYWORDS: Coating, Luminescence, Scintillation, Temperature metrology, Energy transfer, Scintillators, Point spread functions, Silica, Glasses, Molecules
ST-401 plastic scintillation films were prepared by spin coating. The self-supporting films were obtained and they
displayed a satisfactory appearance in terms of uniformity and transparence. The relationship between
photoluminescence (PL) property and film thickness was presented and the influence of preheat temperature of coating
solution on PL intensity of the film was discussed in detail. The results indicated that the PL intensity increased whereas
PL intensity ratio of PTP to POPOP decreases with the increase of the film thickness. PL intensity of the film at 423 nm
was improved remarkably by heating the coating solution, which makes ST-401 films have a promising application in
the detection of low-intensity pulsed fission neutron flux.
In combination with pyrolysis processing, the smooth, transparent and dense Gd2O3:Eu3+ thin films have been prepared by sol-gel technique under the absence of inert atmosphere. Comparing with powder samples, there is a remarkable variation in the excitation spectrum of thin film, which indicates that the energy transfer between Gd2O3 host lattice and Eu3+ activator is more effective in film configuration. The results of emission spectra excited by UV indicate that the optimal concentration of Eu3+ is about 10 mol.%. The phenomenon of luminescence reduction was observed for the films annealed at 1000°C, which results from the phase transition of cubic to monoclinic structure. The emission spectrum under X-ray excitation is also presented.
Europium-doped gadolinium oxide films were prepared by the sol-gel method and spin-coating technique. The emission spectra of the films were investigated under both UV and X-ray excitation. Three kinds of cross-linking agents (EG, PEG200 and PEG400) were added to increase the thickness of the films. The luminescence intensity and the thickness of different film indicated PEG200 was the best cross-linking agent among the three compounds. At the same time, UV assisted technique as well as thermal decomposition technique have been introduced to reduce the film forming period and to prepare high quality luminescence films, and they can accelerate the film deposition process extremely.
The silica antireflective film doped PEG (polyethylene glycol) and siloxane into aged base-catalyzed colloidal SiO2 suspension has been formed. It is illustrated that its laser induced damage threshold and scratch-resistant capability have been improved, and the film can be also used for a longer time in practical applications. By means of investigation of the surface structure, transmission spectrum and laser damage threshold of the film. The role of the siloxane is analyzed.
A new scheme of sensor is presented in this paper. The optimization of parameters of the sensor is carried out for designing optical sensor with high sensitivity. By data simulation, the resolutions of nf, kf and df of the film sensor are predicted to be less than 10-7, 10-5, 10-3 nm, respectively. The optical parameters of sol-gel SnO2 film were measured under different dip rates and annealing temperatures, and the sensitivity to the gas C3H8 was investigated. The results indicate that the detection limit is available to 10-1 ppm on the condition of optimum optical parameter and incident angle.
Large size potassium dihydrogen phosphate (KDP) crystals were coated with a polymethyltriethoxysilane (PMTES) coating for environmental protection. The optical property and environmentally protective ability of coatings are investigated. The coatings have high transmission in the range of 200 to 1100 nm. On the conditions of wavelength 1.054 micrometer and a pulse length 1 ns, the laser damage threshold of the coating is higher than 8.4 J/cm2. It is found that the thresholds of the coatings are not obvious change below 80 degrees Celsius and increase with the increasing of the cured temperature. The fogging phenomenon of the KDP crystals coated with PMTES coating has not been observed after more than one year in ambient atmosphere.
In this paper, the antireflective coatings consisting of porous silica particles from a silica sol are applied by dip method. The relationships among composition, viscosity and temperature have been studied. The coating homogeneity is opium for the laser wavelengths of 1064 nm, 532 nm and 355 nm. The peak transmission of coated BK-7 glass substrate is higher than 99.5%. The laser induced damage thresholds of the antireflective coatings were range of 7 - 10 J/cm2, for 1 ns pulse width and 1064 nm wavelength. These damage thresholds were suitable for our national ICF program. It is noted that the optical homogeneity of coating and the viscosity of coating sol were strongly influenced by the temperatures in the duration of sol ripening.
Silica antireflective coatings were deposited on KB-7 glass substrates by sol-gel method. The sols were produced via ammonia catalysis tetraethylorthosilicate (TEOS) diluted in ethanol, using different molar ratio, R, of H2O/TEOS. The influence of amount of water on structure of coatings was investigated by measuring thickness, refractive index, and infrared spectrum of the coatings and BET surface area of the dried gel silica power. The results revealed that the thickness and the refractive index were decreased with the increase of R, whereas the surface area was increased with the increase of R. The infrared spectra indicated that the densification of coating reduced with increase of R.
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