PEGDA/ETPTA光子晶体对RhB的荧光偏振性能调控

Regulation of fluorescence polarization of RhB by PEGDA/ETPTA photonic crystals

摘要:

将罗丹明B(RhB)掺于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)中,制备了具有不同光子带隙的RhB-PEGDA/ETPTA反蛋白石结构光子晶体复合膜。通过反射光谱、荧光光谱对复合膜进行表征,研究了光子晶体对RhB的荧光偏振性能调控。结果表明,单纯的RhB荧光具有偏振性,当复合膜的光子带隙恰好匹配RhB的发射峰(595 nm)时,成功实现了对发射光偏振态的调控,当光子晶体层厚度为6.94 μm时,荧光偏振调控效果最好,偏振各向异性值为0。当复合膜的光子带隙与激发波长(555 nm)匹配时,偏振各向异性值为0.082；与发射峰红带边缘(665 nm)匹配时,偏振各向异性值为0.12；不与发射峰相关(730 nm)时,偏振各向异性值为0.16,与RhB自身荧光偏振性相当。可见,带隙适当的光子晶体具有偏振调控的功能。

Abstract:

Rhodamine B (RhB) was incorporated into polyethylene glycol diacrylate (PEGDA) and ethoxylated trimethylolpropane triacrylate (ETPTA) to prepare RhB-PEGDA/ETPTA with different photonic band gaps Inverse opal structure photonic crystal composite film. The composite film was characterized by reflection spectrum and fluorescence spectrum. And the fluorescence polarization performance regulation of RhB by photonic crystal was studied. The results show that when the photonic bandgap of the photonic crystal composite film exactly matches its emission peak (595 nm), the polarization state of the emitted light is regulated successfully. When the thickness of the photonic crystal layer is 6.94 μm, the fluorescence polarization regulation effect is the best, and the polarization anisotropy value is 0. When the photonic bandgap of the inverse opal composite film matches the excitation wavelength (555 nm), the polarization anisotropy value is 0.082; when it matches red band edge of the emission peak (665 nm), the polarization anisotropy value is 0.12; When the emission peaks are uncorrelated (730 nm), the polarization anisotropy value is 0.16, similar with that of pure RhB. All these results indicate that photonic crystals with suitable bandgap can regulate the polarization state of fluorescence.