Non-coherent source of ultraviolet
radiation capable of producing quasi-monochromatic radiation from the near UV
to the vacuum UV
The operation of the excimer
lamps relies on the radiative decomposition
created by various types of discharges.
- Using noble gas, halogen, or noble gas / halogen mixtures with fill pressure
the radiative decomposition of the excimer or the exciplex produces nearly monochromatic radiation. Some of the commercially available wavelengths for the particular excimers or exciplexes are
with KrCl, and
with XeCl, obtained with efficiencies of 5 - 15 %. Pulsed Xe-excimer (Xe2) lamps may have up to 40 % efficiency. Good efficiencies are also obtained with XeBr at
and with XeI at
Other wavelengths produced with much less efficiency are
(I2) (see Table 1).
Table 1: Peak wavelengths
() obtained in dielectric-barrier discharges with mixtures of noble gas (Ng) and halogen (X2). Wavelengths of commercially available lamps are shown in boldface type. The molecular species indicated are excimers or exciplexes.
- Phosphors are used to transform the UV radiation into visible radiation. This is the basis of mercury-free fluorescent lamps and of flat plasma-display panels with a large screen.
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 335
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook