不同分子量PDMS与铕形成配合物的光谱特性研究

Study on Spectrum Properties of Eu^(3+) Complex With Different Molecular Weights of Polydimethylsiloxane

Eu3+与不同分子量的聚二甲基硅氧烷(PDMS)形成的配合物PDMS-Eu(Ⅲ)受紫外光激发后,激发的PDMS将吸收的能量传递给Eu(Ⅲ),使Eu(Ⅲ)受到激发,因而使其在可见光区的发射荧光峰增强.由于PDMS-Eu(Ⅲ)中不同分子量的PDMS的构象不同,受光激发后的能量也不同,因此,含不同分子量PDMS配体的PDMS-Eu(Ⅲ)从PDMS到Eu(Ⅲ)的能量传递效率也不同,使Eu(Ⅲ)在可见光区的发射荧光峰峰强也不同.当PDMS的分子量为30 000时,PDMS-Eu(Ⅲ)的能量传递效率最高,可达48.2%,因而Eu(Ⅲ)在可见光区的发射荧光峰峰强最强.

After PDMS - Eu（Ⅲ） complexes formed from Eu^3＋ and PDMS is excited with ultraviolet light, the excited PDMS would transfer the absorption energy to Eu（ Ⅲ ）, leading to the increase in the emission fluorescence peaks of Eu（ Ⅲ ） in the visible area. Because the conformations of PDMS - Eu（ Ⅲ） complexes with PDMS of different molecular weights are different, their energies are different after the excitation of the light. Thus, their energy transfer efficiency from PDMS to Eu （ Ⅲ ） are different, leading to the different intensity of the emission fluorescence peaks of Eu （ Ⅲ ） in the visible area. When the molecular weight of PDMS is 30 000, the energy transfer efficiency of PDMS - Eu （Ⅲ） is the highest. It reaches 48. 2%. Therefore, the intensity of the emission fluorescence peaks of Eu（Ⅲ ） in the visible area is the highest.