本文采用稳态和瞬态光谱方法研究了四种二苯基碘鎓盐(Ph_2I~+X~-)对蒽、芘、苝的激发态的猝灭作用,通过Stern-Volmer方程确定了它们的光致电子转移速度常数,结果表明Ph_2I~+AsF_6~-对荧光猝灭是最有效的,猝灭过程是扩散控制的。比较荧光强度和荧光寿命测定得到的猝灭常数,表明猝灭是动态过程,敏化剂与鎓盐间没有基态复合物生成。 In this paper, the quenching effects of four diphenyliodonium salts (Ph_2I ~ + X ~ -) on the excited states of anthracene, pyrene and perylene were studied by steady-state and transient spectroscopic methods. Their Stern-Volmer equations were used to determine their The results show that Ph_2I ~ + AsF_6 ~ - is the most effective for fluorescence quenching and the quenching process is diffusion controlled. The quenching constants obtained by comparing the fluorescence intensity and the fluorescence lifetime show that the quenching is a dynamic process and there is no ground state complex between the sensitizer and the onium salt.