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全光谱 LED 照明用荧光粉发展现状及趋势
Current Situation and Trend of the Phosphors for Full Spectrum LED Lighting
随着人们对照明品质要求的提高，全光谱发光二极管（LED）照明成为发展热点。本文对全光谱 LED 用关键材料——荧光粉进行了详细分析，对比了每种体系的发光性能并给出了各类型的代表材料，重点阐述了紫光–近紫外光激发的多种颜色荧光粉的优劣势、研究进展以及实际应用情况，对该领域存在问题及其发展趋势、重点产业发展方向进行了分析和展望。目前可供全光谱使用的紫光–近紫外光激发的荧光粉存在蓝粉和青粉普遍发射光谱窄、光效偏低和热稳定性较差，黄粉及远红光荧光粉对紫光或近紫外光的吸收较低导致发光效率不佳，单一基质白光荧光粉的红光发射不足等问题，其中发光光效和热稳定性仍然是制约各类荧光粉应用的关键因素。研究提出，可重点突破适合紫光–近紫光激发高光效和高热稳定性的宽谱蓝粉、青粉、黄绿粉、黄粉、长波红粉以及单一基质白光荧光粉的制备和应用技术，开发与现有应用产品体系相匹配的高效及连续化制备技术，由此促进全光谱 LED 的进一步发展。
With the increase of the requirements for lighting quality, full spectrum light emitting diode (LED) lighting becomes the development hotspot. In this paper, the key materials for full spectrum LED phosphors are discussed and compared in detail. The advantages and disadvantages, research progress, and practical application of various color phosphors excited by violet and near ultraviolet light are emphasized, and then the existing problems, development trend, and industrial direction in this field are analyzed and prospected. Currently, there remain many problems in the phosphors excited by violet and near ultraviolet light, which can be applied in full spectrum. For example, the blue and cyan phosphors take on narrow emission spectrum, low light efficiency, and poor thermal stability; yellow phosphors and far-red phosphors have a low luminous efficiency due to their low absorption of violet or near ultraviolet light; and single matrix white phosphors have insufficient red light emission. Among them, luminous efficiency and thermal stability are the key factors restricting the application of the phosphors. Therefore, it is urgent to research the preparation and application technology of wide spectrum blue, cyan, yellow green, yellow, far-red, and single matrix white phosphors with high light efficiency and thermal stability, and develop the high-efficient and continuous preparation technology of the present phosphor products, to promote the further development of full spectrum LED.
full spectrum LED / high-quality lighting / violet LED chip / phosphors
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