Keywords: 
• 银纳米颗粒 /
• 表面等离激元共振 /
• 四苯基卟啉 /
• Q带荧光

Abstract: The change of Q-band fluorescence lifetime of tetraphenyl porphyrins（TPP） adsorbed on the surface of silver nanoparticles is reported.The lifetime is extended when the surface plasmon resonant peak of silver nanoparticles is adjusted to be resonant with the Q- absorption band,which is due to the fact that silver nanoparticles bring a large surface plasmon resonant enhancement effect to the surface light field,and the excited TPP molecules have a higher polarity.The enhanced light field will stabilize the TPP molecules of high polarity,which causes the extended Q-band fluorescence lifetime.It has an important significance in photodynamic therapy using porphyrins as photosensitizer.