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制造商对美国能源部LED效能目标稳步推进
美国能源部（DOE）是当局的先锋，鼓励发展固态照明（SSL）。虽然制造商已经取得了巨大的进步，其产品的功效，美国能源部热衷于推动LED制造商更难以实现LED技术的全部潜力。
白光LED用荧光粉转换––皇家蓝色LED结合钇铝石榴石（YAG）荧光粉––和混色发光二极管––单独的红，绿，蓝（RGB）设备的光混合––拥有199和266流明/瓦的理论最大的功效，分别为（一次内在包装效率低下了考虑到）。
美国能源部已通过这些数字作为目标，并鼓励制造商加倍努力，但主要挑战织机。本文总结了今天的LED的性能和展望前面的障碍，将需要清除之前，美国能源部的野心得到满足。
DOE sets the goal
The U.S. Energy Policy Act of 2005 directs the DOE to “support research， development， demonstraTIon， and commercial applicaTIon acTIviTIes related to advanced solid-state lighting technologies based on white light emitting diodes.” In support of that objective， DOE periodically releases its Multi-Year Program Plan.¹ Last published in April 2012， the plan is a comprehensive document that focuses on core technology research and product development， which is an important part of the department’s efforts to guide SSL technology from laboratory to marketplace.
The plan includes the DOE’s projections of efficacy， detailing the targets from 2011 onwards （Table 1）。 Projections are included for the two leading white-light LED technologies： royal-blue LEDs combined with YAG-phosphor conversion and RGB color-mixed LEDs （see the TechZone articles “Whiter， Brighter LEDs” and “Creating White Light by Adding – Not Subtracting – Color” respectively.）
