随电气照明的快速发展，电能消耗越来越大。实现绿色照明是低碳经济的必然要求，而推广新型绿色电光源是关键一环。无极灯是一种基于高频电磁感应和无极气体放电的新型电光源，由电感耦合等离子体（inductively coupled plasma，ICP）中的Hg253.7nm共振谱线激发稀土三基色荧光粉进而发出可见光，具有寿命长、光效高、低汞害、无频闪等优点，符合绿色照明的要求。然而发光机理有待深入分析，光效有待进一步提高，这是当前制约无极灯发展的主要技术瓶颈。论文在参阅国内外相关文献、调研无极灯生产实际的基础上，针对无极灯ICP放电特性与光效提高途径展开理论分析与实验研究，工程上积极探索提高无极灯光效的途径，理论上以期对无极气体放电与ICP等离子体理论的发展和完善提供一定依据。论文介绍了高频放电的物理过程，结合Maxwell 3D有限元仿真，对无极灯的发光机理进行了深入分析。论文搭建了一个集无极灯ICP等离子体产生、诊断于一体的综合性实验平台，通过原子发射光谱分析与光照度测量，实验研究了冷端温度、放电参数、铟网位置等因素对无极灯发光特性的影响规律。研究发现：无极灯Hg253.7nm共振谱线的相对强度随冷端温度、气体压力、输入功率的变化均近似呈正态分布，即存在一组最佳的冷端温度、气体压力、输入功率，对应最大光效；无极灯Hg253.7nm、Hg185.0nm共振谱线的相对强度，当铟网位于耦合线圈两端时最强，位于线圈中部时较弱，远离线圈时最弱；光照度则不随铟网位置变化而变化；当铟网位于耦合线圈两端及中部时无极灯启动较快，远离耦合线圈时启动较慢，存在一个最佳的铟网位置，该处电磁场能量密度最大，对应最佳的启动性能。并从气体放电的角度对实验结果进行了定性分析，所得结论对无极灯的参数优化与模型设计具有重要的指导价值。无极灯作为一种新型绿色电光源，市场潜力巨大，正逐步走入大众视野。其研发在国内正处于起步阶段，尚有很多工作要做。
With the rapid development of electric lighting, the consumption of electric power is more and more. The realization of green lighting is the inevitable requirement of low carbon economy, and popularizing new green electric light sources is the key. As a kind of new electric light source, electrodeless discharge lamp (EDL) is based on high-frequency electromagnetic induction and non-polar gas discharge. Visible light is emitted as a result of Hg253.7nm resonance spectrum line inspiring triphosphor fluorescent powder. EDL is long-life, high-efficiency, low-mercury and there is no stroboscopic light, fitting in with the requirement of green lighting. However, the luminescence mechanism of EDL needs to be analyzed thoroughly, and the luminous efficiency needs to be improved further, which are now the main bottlenecks of EDL.In the thesis, theoretical analysis and experimental research on inductively coupled plasma (ICP) discharge characteristics and luminous efficiency improvement of EDL is carried out, on the base of referring to the related literature at home and abroad as well as surveying the actual production of EDL. In order to actively explore ways of improving the luminous efficiency of EDL in engineering, and provide a basis for the development and improvement of gas discharge and ICP plasma theory.The thesis introduced the physical process of high frequency discharge, and analyzed the luminescence mechanism of EDL in depth, combining with the finite element simulation of Maxwell 3D. The thesis built a comprehensive experiment platform which integrates the generation and diagnosis of EDL’s ICP plasma, and studied the influence law of factors such as cold spot temperature, discharge parameters and indium net position on EDL’s luminous characters by atomic emission spectral analysis and illuminance measurement.The study found that the relative intensity of Hg253.7nm resonance spectra line of EDL is distributed in a nearly normal fashion with the variation of cold spot temperature, gas pressure and input power. In other words, there is a set of optimum cold spot temperature, gas pressure and input power, and the associated luminous efficiency is the maximum. The study also found that the relative intensity of Hg253.7nm、Hg185.0nm resonance spectra line is strongest when indium net is located at both ends of coupling coil, weaker when middle and weakest when far away from coupling coil. The illuminance is independent of indium net position. And EDL starts faster when indium net is located at both ends and middle of coupling coil, slower when far away from coupling coil. In other words, there is an optimum indium net position, where electromagnetic energy density is the largest, and the associated start-up performance is the maximum. The results are qualitatively analyzed from the standpoint of gas discharge theory, which has important guiding values to pattern design and parametric optimization of EDL.As a kind of new electric light source, EDL has great market potential, and is gradually entering the public view. However, the research and development in domestic is just beginning, a lot of work needs to be done.
