Dielectric Barrier Discharge Lamps

A description of current DBD lamp projects can be found here.

Short Wavelength Interactions with Matter (SWIM Group 2002-2005)

Associated Individual Member (non-EU) of the European Union funded, Cost Action 529 "Efficient Lighting of the 21st Century"

Photon emission from the decay of rare-gas and rare-gas/halogen excimer molecules (eg. Xe,2*, Kr2*, Ar2*, XeCl*, KrCl*) form the basis of an important class of incoherent ultraviolet (UV) and vacuum ultraviolet (VUV) sources covering the range 80nm-350nm.

Sources with these wavelengths are already important for, but also have significant, unrealised potential for, applications in materials and environmental processing. Dielectric Barrier Discharge (DBD) source generate UV/VUV output from excimer molecules with very high electrical efficiency (~10-20%) using high-voltage AC excitation. In a DBD configuration one electrode (or both) is separated from the plasma by an insulating dielectric layer, and the discharge consists of a series of short-lived narrow filamentary channels or micro-discharges that occur stochastically in time. Although the vast majority of DBD lamps have traditionally been powered using AC voltage waveforms, short-pulsed excitation techniques have important advantages. In particular, the lamp efficiency for VUV production from a Xe2* lamp (172nm) can be dramatically increased by a factor of three (compared to AC excitation) by using fast excitation pulses of <1microsecond duration followed by “idle” periods (~100microsecs). The output is generated in short pulses of much higher peak power from homogeneous discharges or micro-discharges appearing as cone or funnel shaped structures (rather than narrow filaments).

Major projects completed to date include:

DBD Lamp for plasma diagnostic measurements

High-peak-power "finger" lamp @ 172nm

Related Links

Cleaning and Surface Modification - We are currently investigating short-pulsed VUV sources for broad area surface treatments.

ICS Business Innovation - Lamp developments are available for licensing or for further collaborative development.

Postgraduate Research Opportunities


Recent invited conference presentations:

Other recent conference presentations: