基于静电纺丝工艺的LED远程荧光片制备技术  

Fabrication Technology of LED Remote Fluorescent Sheets Based on Electrostatic Spinning Process

作　　者：牛萍娟[1,2,3] 薛卫芳[1,3] 宁平凡[2,3] 王雪飞[2] 吴英蕾 朱文睿[1,3] 

机构地区：[1]天津工业大学电子与信息工程学院,天津300387 [2]天津工业大学电气工程与自动化学院,天津300387 [3]天津工业大学大功率半导体照明应用系统教育部工程研究中心,天津300387

出　　处：《发光学报》2016年第5期567-572,共6页Chinese Journal of Luminescence

基　　金：天津市自然科学基金(15JCQNJC41800);科技部中小企业发展专项资金(SQ2013ZOA100010)资助项目

摘　　要：首次提出了一种基于静电纺丝工艺以柔性PET为基底的新型LED远程荧光片的制备方法,实现了蓝色LED芯片与荧光粉层相分离的免封装器件结构。采用静电纺丝工艺制备了黄色荧光片和红色荧光片,并研究了黄色荧光片的透射率、吸收率、PL谱及红色荧光片对白光LED的光学性能参数的影响,包括光通量、相关色温、光效。实验结果表明,所制备黄色荧光片在可见光波段具有良好的透光性,荧光片的光谱完全由荧光粉来决定,不需要考虑复杂工艺的影响;使用红色荧光片可以在保持高光效的同时将球泡灯的相关色温由5 595 K降低为3 214 K,这在曲面发光及色温调节方面为灯具设计提供了广阔的空间。A new method of preparing the LED remote fluorescent sheet based on the electrostatic spinning process with flexible PET substrate is proposed,and the free package device structure is realized by separating the blue chip and the phosphor layer. Electrostatic spinning process is a new technology to prepare fluorescent sheet with high performance,which can effectively solve the problem of uneven distribution of fluorescent powder. The yellow and red fluorescent sheets were prepared by electrostatic spinning process. The transmittance,absorption rate,PL spectra of yellow fluorescent sheet were studied. The effect of red fluorescent sheet on the optical performance parameters of white LED,including the luminous flux,correlated color temperature and luminous efficiency,was also studied. Experimental results show that the prepared yellow fluorescent sheets have good light transmission in the visible band. Fluorescent spectrum is completely determined by the fluorescent powder,so we do not need to consider the influence of complex processes. Using red fluorescent sheet can keep high efficiency and decrease the correlated color temperature of the bulbs from 5 595 K to 3 214 K at the same time,which provides more chance for the design of lamps andlanterns in luminescence of curved surface and regulation of color temperature. With the continuous improvement of the technology,the remote fluorescent technology based on the electrostatic spinning process will be more perfect,the performance of the product will be further improved,and the pace of the white LED going into the lighting field is promoted.

关 键 词：静电纺丝 LED远程荧光片 透射率 PL谱 相关色温 

分 类 号：O482.31[理学—固体物理]