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1 引言在能量的使用中，电力是极端重要和持续增长的一项。仅在美国，电力生产每年就花费600亿美元。而电能的消费不能仅用金钱来衡量，电能的生产还带来烟雾、二氧化碳污染等环境恶化的代价。约20%的电能用于照明。应用最广泛的人工光源是白炽灯和荧光灯。但这一情况将会改变
1 Introduction In the use of energy, electricity is an extremely important and growing one. In the United States alone, power generation costs $ 60 billion a year. The consumption of electricity can not be measured by money alone. The production of electricity also brings about the cost of environmental degradation such as smog and carbon dioxide pollution. About 20% of the electricity is used for lighting. The most widely used artificial light sources are incandescent and fluorescent lamps. But this situation will change