Study shows 3D printing of PQD polymer architectures at room temperature

Korean researchers have developed a technology that enables the production of complicated three-dimensional structures based on quantum dots (QD) at room temperature.

Quantum dots are nanoscopic semiconductor particles that can emit light in different colors. The research group used a novel composition of perovskite quantum dots (PQDs), which are characterized by high luminous efficiency and color diversity. Compared to conventional methods, which often require heat treatment, this new technique enables the fabrication of QD-based 3D structures without heat exposure, avoiding material degradation and shape changes.

Lead author Hongryung Jean said, “Our streamlined QD 3D printing process enables stable manufacturing at room temperature, promising advancements in information encryption systems and optoelectronic printing technologies.”

A key element of the technology is the use of a hydroxypropyl cellulose (HPC) polymer and dichloromethane (DCM) as a volatile solvent, which enables stable extrusion of the luminous PQD inks at room temperature. By optimizing the printing parameters, structures can now be created that glow in the primary colors red, green and blue (RGB).

The practical application of this technology has been demonstrated in an anti-counterfeiting and encryption system, in which 3D printed geometric shapes are used to exploit the unique light emission properties of PQDs. For example, a 6 x 5 cube array has been developed that can display alphabetic letters at different angles, making it particularly interesting for security-related applications.

The head of the study, Professor Im Doo Jung from the Department of Mechanical Engineering at UNIST, said: “This advancement preserves the photoluminescence properties of PQDs without the need for heat treatments, driving innovation in optoelectronic and energy applications.”

This advance in 3D printing sets new standards for encryption technologies and anti-counterfeiting measures in the digital age and opens the door for future applications in various industrial fields.