RhB-PEGDA/ETPTA光子晶体复合膜对RhB的荧光偏振性能调控

Regulation of fluorescence polarization of RhB by RhB-PEGDA/ETPTA photonic crystal composite films

将含有罗丹明B(Rh B)的聚乙二醇二丙烯酸酯(PEGDA)和乙氧基化三羟甲基丙烷三丙烯酸酯(ETPTA)混合物与Si O_(2)光子晶体进行复合,制备了Rh B-PEGDA/ETPTA光子晶体复合膜(简称复合膜)。通过反射光谱、荧光光谱对复合膜的光学性能进行了测试,研究了光子晶体特性对RhB荧光偏振性能的调控。结果表明,Rh B空白膜的荧光偏振态是部分椭圆偏振态;当复合膜的光子带隙(PBG)与其发射峰波长(595nm)匹配时,成功实现了对出射荧光偏振态的调控;当光子晶体层厚度为6.94μm时,荧光偏振调控效果最好,荧光各向异性值(r)为0。当复合膜的PBG与激发波长(555nm)匹配时,r为0.082;与发射峰红带边缘波长(665nm)匹配时,r为0.12;与发射峰波长不相关(730nm)时,r为0.16。由此可见,只有适当PBG的复合膜才会对Rh B的荧光偏振态产生调控作用。

RhB-PEGDA/ETPTA photonic crystal composite films were synthesized by compounding SiO2 photonic crystals with a mixture of polyethylene glycol diacrylate(PEGDA)and ethoxylated trimethylolpropane triacrylate(ETPTA)containing Rhodamine B(RhB).The composite films were then characterized by reflection spectrum and fluorescence spectrum for optical property analysis,followed by investigation on the RhB fluorescence polarization regulation performance.The results showed that RhB alone blank film had fluorescence elliptical polarization.When the photonic bandgap(PBG)of the photonic crystal composite film exactly matched its emission peak wavelength(595 nm),the polarization state of the emitted light was regulated successfully.And the fluorescence polarization regulation effect reached the best with the polarization anisotropy value(r)of 0 when the thickness of the photonic crystal layer was 6.94μm.The r was 0.082 when the PBG of the photonic crystal composite film matched its excitation wavelength(555 nm),while the r was 0.12 when that matched red band edge of the emission peak(665 nm),and r was 0.16 when that did not match the emission peak wavelength(730 nm).All these results indicated that the composite film with suitable PBG could regulate the polarization state of fluorescence.