摘要:自上世纪九十年代初期,GaN基蓝色发光二极管被用于开发白光LED照明器件以来,白光LED因其良好的稳定性、较长的使用寿命、高发光效率以及低能耗等优点,引起人们的广泛关注。
目前,在一些传统的LED制备方法(如,集成单芯片法,荧光粉转换法等)中,氮化物荧光粉是合成制备及配合LED使用时不可缺少的成分,因此得到了越来越多的科研工作者们的重视。巧妙采用氮化物荧光粉的稳定性、良好的显色指数和超高的发光效率,可以使白光LED的发光效果更佳、性能更稳定,这也突显了其在LED荧光粉领域不可替代的地位。31913
本篇论文将主要介绍最近几年LED用氮化物荧光粉的发光原理、研究现状、制备方法以及在白光LED中的应用情况。毫无疑问,氮化物荧光粉凭借着发光强度高、发射带宽、稳定性好等优势,必将成为21世纪最有前景的新型荧光材料。31913
毕业论文关键词:白光LED 氮化物荧光粉 发射光谱
The Research Status and Development Trend of Nitride Phosphors Used in LED
Abstract: Since the early 1990s, GaN-based blue light-emitting diodes (LEDs) were used for development of white-light LED device. White LED caused people's extensive concern that because of its good stability, long service life, high luminous efficiency, and the advantages of low energy consumption.
Nitride phosphors were investigated indispensably for the preparation of synthetic LEDs in some of the traditional LED preparation methods (e.g., integrated single chip, phosphors conversion method, etc.), so got more and more the attention of the scientific research workers. White LED luminous effect will be better that the stability, good color rendering index and ultrahigh luminous efficiency of the ingenious use of nitride phosphors, nitride phosphors also highlights its irreplaceable status in the field of LED phosphors.
This paper mainly introduces LED with nitride phosphors luminescence principle, the research status, and the preparation methods in the application of the white LED in recent years. There is no doubt that nitride phosphors with high luminous intensity, the advantages of the transmitting bandwidth, good stability, it will become the 21st century's most promising new fluorescent materials.
Keywords: White-light LED Nitride phosphors Emission spectrum
目录
1. 绪论 1
2. 白光LED的研究现状 3
2.1 白光LED的基本原理及应用 3
2.2 白光LED的研究现状及发展前景 4
3. LED用氮化物荧光粉的发光特性及光谱研究 6
3.1 荧光粉的发光原理及光谱特征 6
3.1.1原理介绍 6
3.1.2 CaAlSiN3:Eu2+的激发及发射光谱 7
3.1.3 Eu2+的浓度对氮化物发光强度的影响 9
3.2 利用荧光粉实现白光LED的方法 11
3.3 LED氮化物荧光粉在国内外的研究现状 12
3.4 氮化物荧光粉的主要制备方法 14
4. 结论与展望 16
参考文献 17
致谢 19
1. 绪论
自从地球的诞生,光就给予了我们一个无比绚丽多彩的世界,无论是史前的恐龙时代还是现在的文明社会,光都成了我们生活当中一个不可或缺的伙伴。我们爱她,因为她能给我们带来温暖驱走严寒,她能给处在绝境当中的人们带来希望,她能赶走人们内心的雾霾,总之,一切美好的事物总是少不了关于光的遐想。从远古时期使用的自然光,到后来钻木取火,在到如今的现代社会,人们一直在对光进行不停的探索。
光是什么?十九世纪初,光的衍射证明光是一种波[1],但是波动理论却无法解释光的所有性质。伟大的科学家麦克斯韦提出的光是一种电磁波学说,使光是一种波的理论更加占据了当时的主导地位。二十世纪初,爱因斯坦提出了著名的光子概念,这一学说,后来通过不断的完善总结出:光既是一种电磁波,同时又由许多具有波粒二象性的光子组成。 LED用氮化物荧光粉的研究现状及发展趋势:http://www.751com.cn/huaxue/lunwen_28231.html