Information anti-counterfeiting has played important role in our daily lives , especially in economic fields (i.e., banknotes, passports, certificates, packaging). In view of the optical properties and thermo-induced fluorescence switching, DCzPy has a great potential for application in anti-counterfeiting. As shown in Fig. , the fluorescent two-dimensional (2D) code film of DCzPy was prepared by covering a stainless steel 2D mold on a square glass sheet (with a side length of 4 cm), and simply smearing a chloroform solution of DCzPy (1.0 10 -3 M). After that, the thermal annealing process is carried out on a hot stage at 473 K for 5 minutes. Each experiment of preparing the fluorescent film and the annealed film was carried out more than 3 times, and the results showed good reproducibility. It is worth noting that the 2D code film of DCzPy in response to heat can change its luminescent emission, but the film still kept highly transparent in a visible light range, which was one vital index for the invisible anti-counterfeiting. As a demonstration, a blue-light emitting 2D code film was facilely fabricated as before. Upon reducing the temperature to ice point, the 2D code turned to green fluorescence. Then, with gradually elevating temperature, it slowly recovered to blue emission. The as-prepared 2D code could be successfully scanned by cellphones.