聚碳酸酯基荧光复合塑料的制备及发光性能的研究
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摘要
采用高温熔融混合和高温模压的方法,以聚碳酸酯和稀土荧光材料为原料,制备出不同厚度(0.5、1.0、和1.5 mm)的荧光复合塑料。通过扫描电子显微镜、荧光分光光度计和荧光光谱分析系统等测试手段,对其进行了测试表征。研究结果表明:稀土荧光材料在聚碳酸酯中均匀分散;荧光复合塑料的激发与发射光谱强度与其厚度成正比关系,在1.5 mm厚度时最大,光谱的形状没有随着厚度的改变而改变;荧光复合塑料在激发光不同功率(600、850、1 100、1 350和1 600 mW)的激发下,其发光强度与激发光功率成正比关系,荧光转换效率与激发光功率成反比关系,对于给定厚度和浓度的荧光复合塑料,其所制备的白光LED的光通量与激发光功率满足线性关系,φ光通量=0.226·P激发光+23.08,表明荧光复合塑料是一种适合于白光发光二极管(LED)应用的材料。
The fluorescent composite plastics with different thickness( including 0. 5,1. 0 and 1. 5mm) were prepared by using polycarbonate and rare earth fluorescent materials as raw materials through high temperature melt mixing and high temperature compression molding method. By scanning electron microscopy,fluorescence spectrophotometer and fluorescence spectrum analysis system test methods,the results indicate that the rare earth fluorescent material is dispersed in polycarbonate uniformity; fluorescence excitation and emission spectral intensity and thickness are proportional to the thickness of the material,and they reach the maximum values when the thickness is 1. 5 mm; spectral shape don't change with the change of thickness;fluorescent composite plastics in different power( 600,850,1 100,1 350 and 1 600 mW) under the excitation of light, the luminescence intensity and excitation power is proportional to the fluorescence,fluorescence conversion efficiency is inversely proportional to the fluorescence,as to the given thickness and concentration of composite plastic,the luminous flux of white light emitting diode( LED) and the excitation power meet the following linear relationship as follows: φ_(luminous flux)= 0. 226·P_(exciting light)+ 23. 08,which shows that composite plastic is suitable for white light LED.
The fluorescent composite plastics with different thickness( including 0. 5,1. 0 and 1. 5mm) were prepared by using polycarbonate and rare earth fluorescent materials as raw materials through high temperature melt mixing and high temperature compression molding method. By scanning electron microscopy,fluorescence spectrophotometer and fluorescence spectrum analysis system test methods,the results indicate that the rare earth fluorescent material is dispersed in polycarbonate uniformity; fluorescence excitation and emission spectral intensity and thickness are proportional to the thickness of the material,and they reach the maximum values when the thickness is 1. 5 mm; spectral shape don't change with the change of thickness;fluorescent composite plastics in different power( 600,850,1 100,1 350 and 1 600 mW) under the excitation of light, the luminescence intensity and excitation power is proportional to the fluorescence,fluorescence conversion efficiency is inversely proportional to the fluorescence,as to the given thickness and concentration of composite plastic,the luminous flux of white light emitting diode( LED) and the excitation power meet the following linear relationship as follows: φ_(luminous flux)= 0. 226·P_(exciting light)+ 23. 08,which shows that composite plastic is suitable for white light LED.
引文
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[2]KHANH T Q,BODROGI P,VINH Q T,et al.Led lighting:Technology and perception[M].Weinheim:Wiley-VCH Verlag Gmb H&Co.KGa A,2014.
[3]QIU Y,ZHANG B.Optical properties of remote phosphorconverted white LEDs[J].Semicond Optoelectr,2012,33(2):168-178.
[4]HUANG K C,LAI T H,CHEN C Y.Improved CCT uniformity of white LED using remote phosphor with patterned sapphire substrate[J].Appl Opt,2013,52(30):7376-7381.
[5]肖华,吕毅军,徐云鑫,等.传统白光LED与远程荧光粉白光LED的发光性能比较[J].发光学报,2014,35(1):66-72.
[6]牛萍娟,薛卫芳,宁平凡,等.基于静电纺丝工艺的LED远程荧光片制备技术[J].发光学报,2016,37(5):567-572.
[7]肖瑶,范广涵,皮辉,等.PC/YAG∶Ce荧光树脂的制备及光谱分析[J].发光学报,2013,34(11):1419-1423.