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in subjects: "Luminescence"  
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Computed spectral and temporal emissions from a sonoluminescing bubble

Description: A sonoluminescing bubble has been modeled as a thermally conducting, partially ionized, two-component radiating plasma. The recent measurements of {approximately} 100ps pulse widths by Gompf et al. are useful for constructing a consistent plasma thermal conduction model that refines our previous model. Normal thermal conduction in the gas and liquid, vapor pressure, and temperature-dependent surface tension are also included in our nonlinear hydrodynamic simulations of the growth and collapse o… more
Date: February 9, 1998
Creator: Moss, W. C., LLNL
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Addition of a Second Lanthanide Ion to Increase the Luminescence of Europium(III) Macrocyclic Complexes

Description: At present, the microscopic visualization of luminescent labels containing lanthanide(III) ions, primarily europium(III), as light-emitting centers is best performed with time-gated instrumentation, which by virtually eliminating the background fluorescence results in an improved signal to noise ratio. However, the use of the europium(III) macrocycle, Quantum Dye{trademark}, in conjunction with the strong luminescence enhancing effect (cofluorescence) of yttrium(III) or gadolinium(III), can eli… more
Date: December 29, 1998
Creator: Bromm, Alfred J. Jr.; Vallarino, L.M.; Leif, Robert C. & Quagliano, John R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improvement of luminescent properties of thin-film phosphors by excimer laser processing

Description: Thin-films of europium doped yttrium oxide, (Y{sub 1{minus}x}Eu{sub x}){sub 2}O{sub 3}, were deposited on sapphire substrates by metallorganic chemical vapor deposition. The films, {approximately} 400 nm thick, were weakly luminescent in the as-deposited condition. A KrF laser was pulsed once on the surface of the films at a fluence level between 0.9--2.3 J/cm{sup 2}. One pulse was sufficient to melt the film, which increased the photoluminescent emission intensity. Melting of a rough surface r… more
Date: December 31, 1998
Creator: McKittrick, J.; Bacalski, C.F.; Hirata, G.A.; Sze, R.C.; Mourant, J.; Salazar, K.V. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Plasma luminescence feedback control system for precise ultrashort pulse laser tissue ablation

Description: Plasma luminescence spectroscopy was used for precise ablation of bone tissue without damaging nearby soft tissue using ultrashort pulse laser (USPL). Strong contrast of the luminescence spectra between bone marrow and spinal cord provided the real time feedback control so that only bone tissue can be selectively ablated while preserving the spinal cord.
Date: January 1, 1998
Creator: Kim, B. M.; Feit, M. D.; Rubenchick, A. M.; Gold, D. M.; Darrown, C. B. & Da Silva, L. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MOCVD of field emission phosphors using a liquid delivery system

Description: Thin film phosphors for field emission displays show the potential to overcome the life-limiting problems that traditional powders face because of their high surface areas. By depositing a fully dense thin film, the surface area can be dramatically reduced, while the electrical and thermal conductivity is increased. Metal organic chemical vapor deposition offers the ability to deposit high quality, dense films that are crystalline as deposited and at temperatures low enough to allow for inexpen… more
Date: March 1, 1998
Creator: Moss, T.S.; Espinoza, B.F.; Salazar, K.V. & Dye, R.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Understanding and control of optical performance from ceramic materials

Description: This report summarizes a two-year Laboratory-Directed Research and Development (LDRD) program to gain understanding and control of the important parameters which govern the optical performance of rare-earth (RE) doped ceramics. This LDRD developed the capability to determine stable atomic arrangements in RE doped alumina using local density functional theory, and to model the luminescence from RE-doped alumina using molecular dynamic simulations combined with crystal-field calculations. Local s… more
Date: June 1, 1998
Creator: Barbour, J. C.; Knapp, J. A.; Potter, B. G.; Jennison, D. R.; Verdozzi, C. A.; Follstaedt, D. M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Irradiation-Induced Phase Transformations. Final Report, July 1, 1995--June 30, 1997

Description: During the course of this two year program, the authors attention focused largely on the synthesis, structure and properties of group IV semiconductor nanocrystals. They also drew to a close the investigations of defects in amorphous silicon. Work on control of nucleation in amorphous silicon and germanium is ongoing, and has taken important new directions at the interface between basic and applied research under DOE Office of Energy Efficiency support via a subcontract from the National Renewa… more
Date: August 1, 1998
Creator: Atwater, H. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low-jitter sonoluminescence cell

Description: This report constitutes the final report for subcontract B338667. The statement of work for this subcontract was divided into three tasks: Task 1: Produce and quantify the stability of a sonoluminescence cell. The quantification will entail measuring the variation of the amplitude of the light flashes, here called events, and the variation in the time between the individual events i.e., the jitter. On a best effort basis we desire the light amplitude to be stable within 20 So and the jitter bet… more
Date: January 1, 1998
Creator: Lee, R. W., LLNL
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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