Wavelength shifter

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As a wavelength shifter is called fluorescent materials that higher-frequency photons absorb and low-frequency photons emit .

In a wavelength shifter, in many cases one high-energy photon is absorbed and several lower-energy photons are emitted. The photons are usually emitted immediately with relaxation times in the nanosecond range. Frequently used wavelength shifters in organic scintillators are POPOP and 1,4-bis (2-methylstyryl) benzene (Bis-MSB).

These materials are e.g. They are used, for example, in particle physics calorimeters for experiments in basic research ( e.g. in experiments at DESY ), but they are also used in other areas of material technology, e.g. B. to increase the efficiency of photovoltaic cells (solar cells).

Others

Special magnets in electron storage ring systems such as BESSY , which are required to produce short-wave synchrotron radiation, are simply referred to as wavelength shifters.

See also

Individual evidence

  1. ↑ Claus Grupen: Basic course on radiation protection. Springer, 2003, ISBN 3-540-00827-6 , p. 60 ( limited preview in the Google book search).
  2. ↑ A. Dannemann: Investigations into the radiation resistance of polymer materials for use in experiments in high-energy physics , dissertation, Department of Physics at the University of Hamburg , 1996, internal report: DESY F35D-96-06 (PDF; 5.8 MB), accessed on 8. June 2013.
  3. ↑ Patent US4584428 : Solar energy converter employing a fluorescent wavelength shifter. Published April 22, 1986 , Applicant: Hughes Aircraft Co, Inventor: George FJ Garlick. ‌
  4. ^ WS Trzeciak: A "Wavelength Shifter" for the University of Wisconsin Electron Storage Ring . In: IEEE Transactions on Nuclear Science . tape 18 , no. 3 , 1971, p. 213-216 , doi : 10.1109 / TNS.1971.4326010 .