Heui Seob Jeong

Vacuum ultraviolet emission characteristics from He–Ne–Xe gas discharge in an alternating current plasma display panel cell

We measured the time integrated vacuum ultraviolet (VUV) emission spectra of He–Ne–Xe gas mixture from a surface type alternating current (ac) plasma display panel cell. The measured emission lines are the resonance line (147 nm) from Xe*(1s4), the first continuum (150 nm) and the second continuum (173 nm) from Xe dimer excited states. The relative intensities of VUV spectral lines from Xe* and Xe2* are dependent on the He/Ne mixing ratio as well as the Xe partial and total pressure. The intensity of 147 nm VUV increases with the Ne content increase and Xe2* molecular emission increases with the He content increase. Infrared (IR) spectra and the time variation of VUV were measured to explain the reaction pathway and the effect of the mixing ratio of He/Ne on the spectral intensity. A detailed study for the decay time shows that the decay time of 147 nm has two time constants and the radiation of 150 and 173 nm results mainly from Xe*(1s5). The IR spectra shows that the contribution from Xe**(>6 s) to Xe*(...

Two-dimensional multifluid modeling of the He-Xe discharge in an AC plasma display panel

A numerical analysis of the discharge plasma which forms in an AC plasma display panel cell has been made using time-dependent, two-dimensional multifluid equations to understand the discharge physics of He-Xe discharge. The time dependent distributions of the plasma parameters such as the electron temperature, electron density, various ion densities, and excited state species densities, etc., are obtained during the sustain period in a surface type AC plasma display panel (PDP) cell. Because of its importance in the AC PDP operation, the behavior of the wail charges accumulated on the dielectric surface is also examined. It has been found that a DC bias voltage applied to the address electrode controls the distribution as well as the peak values of the plasma parameters. The reaction analysis showed that the dominant reaction process for Xe ion production is the direct electron impact ionization processes and not the Penning ionization process. The cells which have a smaller electrode gap and larger sustain electrode width could accumulate more wall charges and consequently require less voltage for discharge sustainment.

Characteristics of vacuum ultraviolet emission from a surface discharge type alternating current plasma display panel cell

We have measured the time variation of 147 nm vacuum ultraviolet (VUV) resonance emission as well as the continuum such as 152 and 173 nm VUV and the two-dimensional images of 147 nm VUV from the He–Xe discharge in a surface discharge type single alternating current (ac) plasma display panel (PDP) cell using an image intensified charge-coupled device camera. A detailed measurement of the resonance radiation exhibits a fast rising to its peak and decay with multiple time constants. The changes in decay time constants, relative intensities of resonance, and dimer radiation change with the total gas pressure as well as the Xe partial pressure implies that collisional excitation, deexcitation, and interlevel transition play important roles in determining the VUV emission characteristics. The two-dimensional images show that a weak, broad VUV emission comes out from the cathode area with a strong, narrow emission from the anode area. We have solved the He–Xe discharge reaction equations together with the two-d...

Analysis of He-Xe Discharge Kinetics in an AC PDP Cell

We measured the time variation of 147nm VUV Xe*(3P1) resonance emission as well as the continuum from the He-Xe discharge in a single surface discharge type AC PDP cell using an image intensified CCD camera. A detailed measurement of the resonance radiation exhibits a strong pressure broadening, fast rising to its peak and decay with multiple time constant. The decay time constants, relative intensities of resonance and dimer radiation change with the total gas pressure as well as the Xe content which implies that the collisional excitation, deexcitation and interlevel transition play important role in determining the VUV emission characteristics. We solved the He-Xe discharge reaction equations together with the 2-dimensional multi-fluid equations for electron and ions to explain the experimental results and elucidate the dominant kinetic pathways which lead to the VUV emission in the AC PDP cells.

Spatio-Temporal Variation of VUV and IR Emission from Surface Discharge Type AC PDP Cell with He-Xe and Ne-Xe

The spatio-temporal variations of 147nm, 173nm, and IR emission images were obtained from He-Xe and Ne-X surface discharge type AC PDP cell. Differences in the 147nm, 173nm, and IR emission characteristics between He-Xe and Ne-Xe gas mixture were observed and explained by the difference of Xe mobility and dimer reaction coefficients in two cases.

Time-resolved imaging of VUV emission from a He-Xe micro surface discharge

A direct observation of two-dimensional, time dependent behavior of 147 nm and 173 nm vacuum ultra violet emission from a single surface discharge type AC plasma display panel cell were obtained using a gated, image intensified charge-coupled device (ICCD). The images on the ICCD are formed by a pinhole. The two lines show similar spatial profile but quite different temporal behavior.

Spatio‐temporal variation of VUV and IR emissions from surface‐discharge‐type ACPDP cell

— The spatio-temporal variations of 147-nm, 173-nm, and IR emission images were obtained from He-Xe and Ne-Xe surface-discharge-type ACPDP cells. Differences between the 147-nm, 173-nm, and IR emission characteristics between He-Xe and Ne-Xe gas mixtures were observed and explained by the difference of Xe mobility and dimer reaction coefficients in two cases.

The Monte Carlo simulation of resonance radiation trapping of vacuum ultraviolet photons in plasma display panel

We calculate a 147nm vacuum ultraviolet (VUV) photon distribution arriving at the plasma display panel (PDP) phosphor surface by using Monte Carlo simulation. Spectral distributions of photons will be calculated in the PDP cell structure. Especially, the spectral dip at center frequency will be seriously studied. We can give a brief explanation of the spectral dip at center frequency by using the concept of frequency-dependent mean free path.

An efficient DC-PDP cell structure with a wall cathode and wall auxiliary anode

— A new cell structure for a monochrome DC-PDP with a wall cathode and a wall auxiliary anode is suggested. The wall cathode has a sufficient discharge-electrode area to allow maximization of the discharge volume. The wall auxiliary anode surrounds the discharge region, which can effectively control the charged particles in the discharge region. We investigated the characteristics of the new cell structure with a two-dimensional computer simulation and with experiments on a test panel and compared them with those of an earlier cell structure which has a co-planar anode and an auxiliary anode. Special emphasis was given to the effect of the wall auxiliary anode on the discharge characteristics. The new cell structure shows high luminance and improved discharge characteristics such as a short discharge build-up time and decreased minimum sustain voltage. The wall auxiliary anode plays the same role as in the coplanar-anode-type structure, but it demonstrates a better performance.

Modeling Of Microdischarge In Ac-pdp

Time-dependent behabior of various plasma variables of an AC-PDP cell such as the electron temperature, density, densities of ions and excited species and surface charge distribution are obtained by solving the time-dependent , 2-dimensional multi-fluid equations. It showed that the wider the sustain electrode, the bigger the surface charge variation in one period which implies a more stable sustainment can be obtained with wider sustain electrodes.