The present invention relates to a hydrochromic polydiacetylene complex composition, a hydrochromic thin film using the same, and a use of the same. More specifically, provided are a hydrochromic polydiacetylene complex composition which sensitively responds to moisture and a hydrochromic thin film using the same, and the same is applied to biometric recognition and fingerprint recognition. According to the present invention, moisture secreted from fingerprints or the pores of the skin can be sensed through high sensitivity. The distinct position of pores in the biometric fingerprint can be amplified and represented through selective color changes and fluorescence change patterns exhibited when moisture is absorbed. According to the present invention, not only ridge patterns of the fingerprint but also pores spread in the ridges can be minutely recognized. Accordingly, even through extremely partial fingerprinting, the characteristics of the pores can be compared and analyzed, and authenticity can be proved, so that fingerprint recognition rates can be remarkably improved.
HYDROCHROMIC POLYDIACETYLENE COMPOSITE HYDROCHROMIC THIN FILM USING THE SAME AND USE THEREOF