Previously, we reported a novel fluorescence dye, a silylated pyrene derivative, as a DNA labeling agent. In this study, new silylated pyrene derivatives with different linker lengths and different substituents on the silicon atom have been prepared and introduced into oligonucleotides. In particular, when the diphenylsilylpyrene derivative was introduced as a fluorescence dye, the fluorescence intensity of the duplex was enhanced about 20 times compared to the signal in the absence of the target DNA.