Decay kinetics of luminescence and electron emission from MgO crystal powders in ac plasma display panels
Decay kinetics of luminescence and electron emission from MgO crystal powders in ac plasma display panels
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交流等离子体显示面板中 MgO 晶体粉末的发光和电子发射的衰变动力学
DOI：
10.1063/1.3140605
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
T. Yoshioka
中科院分区：
文献类型：
--
作者：
T. Okada;T. Naoi;T. Yoshioka
研究了MgO晶体粉末在5.2eV处的发光衰减动力学和持续电子发射衰减动力学，以了解交流等离子体显示器放电延迟和绝缘体持续电子发射的机理。紫外发光的衰减是非指数的，在低温下表现出可忽略的温度依赖性后，随着温度的升高，衰减增强。热释光测量表明载流子陷阱的存在。作为一种可能的机制，结合从载流子陷阱的热激活的施主-受体对的发光被引入。以交流等离子体显示屏的放电延迟时间作为电子发射性能的评价指标。通过在MgO保护膜上包覆MgO晶体粉末，提高了电子发射强度，降低了其时间和温度依赖性。在相同激发下的比较表明，紫外发光的衰减比电子发射的衰减陡。为了解释实验数据，我们提出了参与的直接电子发射从电子陷阱同步测量电压除了发光相关的电子发射。
Decay kinetics of luminescence at 5.2 eV and those of sustained electron emission from MgO crystal powders were investigated in order to understand the mechanism of discharge delay in ac plasma display panels and sustained electron emission from insulator. The decay of UV-luminescence was nonexponential and the decay was enhanced by increasing the temperature after showing negligible temperature dependence at low temperature. Existence of carrier traps was indicated by thermoluminescence measurements. As a possible mechanism, luminescence from a donor-acceptor pair in combination with thermal activation from carrier traps was introduced. The electron emission properties were evaluated by the measurement of statistical discharge delay time in ac plasma display panels as an indicator. By coating MgO crystal powders on the MgO protective film, the intensity of electron emission increased and its time and temperature dependence was reduced. A comparison under the same excitation revealed that the decay of UV-luminescence was steeper than that of electron emission. To explain the experimental data, we proposed the involvement of direct electron emission from electron traps synchronized with measuring voltages in addition to luminescence-associated electron emission.