摘要:在全球加速发展的时候,环保成为了当前面临的严峻问题。LED因具有长寿命、安全、节能、绿色环保无污染、色彩丰富等优势逐渐成为目前照明的主流,并被誉为新一代的照明光源,荧光粉的性质是影响LED器件质量的主要因素之一,因此研究LED用荧光粉的发光性质,改善现有荧光粉性能及开发新型荧光粉材料是目前荧光粉材料研究的主要目标。本论文主要针对长波发射的LED用荧光粉的研究进展。系统地总结了绿光到红光发射的典型荧光粉的主要发光性质特点,并介绍了最新的长波发射荧光粉材料,这在改善现有荧光粉并开发新型荧光粉方面具有一定的指导意义。55169
毕业论文关键词:荧光粉,发光性质,LED
Abstract: In the global speed up development, the environmental protection has become the current serious problems. LED for a long life, safety, energy saving, green environmental protection pollution-free, rich colors, etc advantages gradually become the mainstream of the current lighting, and was regarded as a new generation of lighting source, the nature of the fluorescent powder is one of the main factors affecting the quality of the LED device, so the LED with the luminescence properties of phosphor, improve existing fluorescent powder properties and development of novel phosphor materials is one of the main targets of the phosphor powder materials research. This paper mainly in view of the long wave emission LED research progress of phosphors.Systematically summarizes the green light to red light emission of the typical characteristics of main luminescence properties of phosphor, and introduces the latest long wave emission fluorescent powder material, it in improving existing fluorescent powder and has a certain guiding significance to the development of novel phosphor.
Keywords: phosphor, luminescence properties, LED
目录
1 LED的概述 4
2 LED的结构及其发光原理 4
3 LED的种类和应用 4
4 发光材料的激发波段 5
4.1 100-200 nm真空紫外光 5
4.2 200-300 nm紫外光 5
4.3 300-480 nm紫外-蓝光 5
5 LED激发的荧光粉体系 6
5.1 白光LED用黄色荧光粉 6
5.2 白光LED用红色荧光粉 7
5.3 白光LED用蓝光激发的绿色荧光粉 8
6 LED用几种最新典型长波发射荧光粉体系 8
6.1 GdSr2AlO5:Ce3+(Ce3+:GSA)荧光粉 8
6.2 Ca5(PO4)2SiO4:Eu2+荧光粉 11
6.3 LiCaPO4:Eu2+和Ca2BO3Cl:Eu2+系列的荧光粉 12
6.4 Ca2.955Sc2-xAlxSi3O12:Ce3+荧光粉 13
结 论 15
参考文献 16
致 谢 17
1 LED的概述
伴随着发光二极管(LED)发明,LED在各个领域上展露头角,显示出巨大的发展潜力,有着长久的寿命并且能节约能源,是能够将电能直接转化为可见光的半导体器件,所以绝大多数的研究者都对LED的发展持有乐观的态度。1993年在日本蓝光发光二极管上取得了技术性的突破,并在接下来的几年时间中用光转换技术实现了白光LED[1]。随着时间的推移,研究人员的发展与研究,LED又出现了许多新型光源,使红色LED发光效率得到很大的提高。在2009年,日本发明了高达249lm/W的LED,这是当时具有最高发光效率的LED,接着2011年佛山Vclab.org也研究出一种新型LED,这种新型LED功率虽然不变,但发热量明显降低,寿命大幅增长。源.自|751,:论`文'网www.751com.cn