This study presents a novel method for fabricating 3D luminescent perovskite quantum dot (PQD)-polymer architectures using direct ink writing (DIW). The method involves creating a stable, room-temperature extrudable ink composed of PQDs and hydroxypropyl cellulose (HPC) in dichloromethane (DCM). By adjusting the halide ratios in the PQD compositions, the ink can produce red, green, and blue emissions. The DIW technique enables precise fabrication of complex 3D structures with programmable features, suitable for advanced anti-counterfeiting and information encryption applications. The method allows for the creation of 3D-printed PQD-HPC architectures with high photoluminescence efficiency and stability. The study demonstrates the ability to print intricate 3D structures, including pyramids and Eiffel towers, with precise control over their dimensions and optical properties. The 3D-printed architectures exhibit distinct color emissions under UV light, enabling the development of secure, luminescent structures for anti-counterfeiting and encryption purposes. The study also highlights the potential of 3D-printed PQD-HPC architectures in enhancing the functionality of printed electronic devices through their unique optical and mechanical properties. The results show that the DIW method is effective in producing stable, functional 3D architectures with high photoluminescence efficiency and stability, making it a promising approach for next-generation optoelectronic applications.This study presents a novel method for fabricating 3D luminescent perovskite quantum dot (PQD)-polymer architectures using direct ink writing (DIW). The method involves creating a stable, room-temperature extrudable ink composed of PQDs and hydroxypropyl cellulose (HPC) in dichloromethane (DCM). By adjusting the halide ratios in the PQD compositions, the ink can produce red, green, and blue emissions. The DIW technique enables precise fabrication of complex 3D structures with programmable features, suitable for advanced anti-counterfeiting and information encryption applications. The method allows for the creation of 3D-printed PQD-HPC architectures with high photoluminescence efficiency and stability. The study demonstrates the ability to print intricate 3D structures, including pyramids and Eiffel towers, with precise control over their dimensions and optical properties. The 3D-printed architectures exhibit distinct color emissions under UV light, enabling the development of secure, luminescent structures for anti-counterfeiting and encryption purposes. The study also highlights the potential of 3D-printed PQD-HPC architectures in enhancing the functionality of printed electronic devices through their unique optical and mechanical properties. The results show that the DIW method is effective in producing stable, functional 3D architectures with high photoluminescence efficiency and stability, making it a promising approach for next-generation optoelectronic applications.