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Development of Mercury-free Light Source System

无汞光源系统的开发

基本信息

批准号：
11680487
负责人：
AONO Masaharu
金额：
$ 2.37万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680487/
关键词：
Mercury-free fluorescent lamp Xenon Pulsed discharge Excimer Afterglow Vacuum ultraviolet source Environment Saving energy 真空紫外放射

项目摘要

We have developed mercury-free light source, which does not pollute the environment. Instead of the resonance line of mercury atom, we employed vacuum ultraviolet (VUV) radiations of xenon to excite phosphor. We made a VUV spectroscopic measurement system and measured VUV radiations from xenon fluorescent lamps; one of them had inner electrodes and the other had external ones. When pulsed voltage was applied to the lamps, radiations were observed two times per period; when the pulse turned on and turned off, the radiations occurred. In the case of inner electrode, the VUV radiated after current turned off (afterglow), thus it was found that the afterglow contributed to improvement of luminance and efficiency. By solving rate equations of excited xenon atoms, it was found that to control inner diameter of a lamp and gas pressure was necessary to control decay of afterglow. Further analysis, for example, investigation of relations between VUV radiations and the number of excited atoms are necessary.It was found that increasing an electrostatic capacity by decreasing thickness of glass tube of an external electrode lamp was favorable to improvement of luminance and efficiency. In the case of an inner electrode lamp, increasing the number of electrodes to promote diffusion of positive column is favorable.We also tried to improve an electronic ballast; the number of parts was reduced by replacing more than two switching elements in a general electronic ballast with one switching elements. Thus, it is able to reduce the size and the weight of electronic ballasts. The characteristics of the new ballast were discussed by solving circuit equations.We improved luminance of low-power lamps, such as backlight of liquid crystal display, as much as that of mercury fluorescent lamps. But further improvement of luminance and efficiency is necessary for general-purpose lamps in terms of developing new VUV source instead of xenon, for example.

我们开发了无汞光源，不污染环境。我们用氙的真空紫外线（VUV）代替汞原子的共振线来激发荧光粉。我们制作了一套真空紫外光谱测量系统，测量了一个内电极和一个外电极的氙气荧光灯的真空紫外辐射。当向灯施加脉冲电压时，每个周期观察到两次辐射;当脉冲打开和关闭时，发生辐射。在内电极的情况下，VUV在电流关闭后辐射（余辉），因此发现余辉有助于提高亮度和效率。通过求解激发态氙原子的速率方程，发现控制灯的内径和气压是控制余辉衰减的必要条件。进一步的分析，例如，研究真空紫外辐射与激发原子数之间的关系是必要的。发现通过减小外电极灯的玻璃管的厚度来增加静电容量有利于提高亮度和效率。在内部电极灯的情况下，增加电极的数量以促进正柱的扩散是有利的。我们还尝试改进电子镇流器，通过将普通电子镇流器中的两个以上开关元件替换为一个开关元件来减少部件数量。因此，能够减小电子镇流器的尺寸和重量。通过求解电路方程讨论了这种新型镇流器的特性，使液晶显示器背光源等小功率灯的亮度得到了与水银荧光灯相当的提高。但是，对于通用灯来说，进一步提高亮度和效率是必要的，例如，开发新的VUV光源来代替氙气。