Spatiotemporal behavior of excited Xe~*(1s_4,1s_5) and Kr~*(1s_5) atoms measured by laser-absorption spectroscopy in unit cell of a plasma display panel with Xe-Kr-Ne ternary gas mixture

摘要

We have studied the effects of ternary gas mixtures of Xe(10%)-Kr(20% and 40%)-Ne on the luminous efficiency in ac plasma display panels. Spatiotemporal behaviors of near infrared (IR) emission was measured by an intensified charge-coupled device camera equipped with a narrow bandpass filter and absolute densities of excited Xe~* and Kr~* atoms in the lowest resonance (1s_4) and metastable (1s_5) levels were measured by a technique of microscopic laser absorption spectroscopy. We have found interesting features from both emission and absorption experiments, such as longer near-IR emission (0.3-0.4 μs) and different temporal behaviors between the excited Kr~*(1s_5) atoms and Xe~*(1s_4, 1s_5) atoms. We have also found that the order of magnitude of the peak density of excited Kr~*(1s_5) atoms (～10~(12) cm~(-3)) was ten times smaller than that of Xe~*(1s_4,1s_5) atoms, and that their decay time was remarkably short (～0.3 μs). These results have then been compared with those for a binary gas mixture of Xe(10%)-Ne. At a certain range of the sustain voltage, the production rate of Xe~*(1s_4, 1s_5) atoms and the luminous efficiency have turned out to e slightly improved for the ternary gas mixtures, compared to the binary gas mixture.