Dye mixtures for ultrafast wavelength shifters
- Texas Tech Univ., Lubbock, TX (United States). Dept. of Physics
- Karpov Inst. of Physical Chemistry, Moscow (Russian Federation)
Particle detectors based on scintillation processes have been used since the discovery of radium about 100 years ago. The fast signals that can be obtained with these detectors, although often considered a nice asset, were rarely essential for the success of experiments. However, the new generation of high energy particle accelerators require particle detectors with fast response time. The authors have produced fast wavelength shifters using mixtures of various Coumarin dyes with DCM in epoxy-polymers (DGEBA+HHPA) and measured the properties of these wavelength shifters. The particular mixtures were chosen because there is a substantial overlap between the emission spectrum of Coumarin and the absorption spectrum of DCM. The continuous wave and time-resolved fluorescence spectra have been studied as a function of component concentration to optimize the decay times, emission peaks and quantum yields. The mean decay times of these mixtures are in the range of 2.5--4.5 ns. The mean decay time increases with an increase in Coumarin concentration at a fixed DCM concentration or with a decrease in DCM concentration at a fixed Coumarin concentration. This indicates that the energy transfer is radiative at lower relative DCM concentrations and becomes non-radiative at higher DCM concentrations.
- OSTI ID:
- 79859
- Report Number(s):
- CONF-940411-; ISBN 1-55899-248-0; TRN: 95:016635
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Scintillator and phosphor materials. Materials Research Society symposium proceedings: Volume 348; Weber, M.J. [ed.] [Lawrence Livermore National Lab., CA (United States)]; Lecoq, P. [ed.] [Centre European pour la Recherche Nucleaire, Geneva (Switzerland)]; Ruchti, R.C. [ed.] [Univ. of Notre Dame, IN (United States)]; Woody, C. [ed.] [Brookhaven National Lab., Upton, NY (United States)]; Yen, W.M. [ed.] [Univ. of Georgia, Athens, GA (United States)]; Zhu, R.Y. [ed.] [California Inst. of Technology, Pasadena, CA (United States)]; PB: 580 p.
- Country of Publication:
- United States
- Language:
- English
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