Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Composites and Functional Polymer Hybrids

CPP 27.5: Vortrag

Mittwoch, 7. September 2022, 12:30–12:45, H39

Programmable Luminescent Tags: Utilizing the interplay of room temperature phosphorescence and oxygen as an information storage device — •Tim Achenbach, Max Gmelch, Heidi Thomas, and Sebastian Reineke — Technische Universität Dresden, Germany

By utilizing the interaction between molecular oxygen and the room temperature phosphorescence of organic materials, continuous-wave-readable and sub-second programmable luminescent tags (PLT) can be realized. They are transparent, flexible and provide a resolution of up to 700 dpi. Information is imprinted by illuminating the PLT with UV light through a shadow mask. By heating the PLT, the information can be erased and a new writing cycle can be started again.

The device consists of two layers on a substrate. The functional layer comprises an organic biluminescent emitter doped into a polymer. The second layer is an oxygen barrier layer. After wet processing in air, molecular oxygen is present in the functional layer of the device, quenching the phosphorescence of the emitter. As energy is transferred to the oxygen during this interaction, it is excited to its highly reactive singlet state and binds to its environment. Over time, all molecular oxygen in the illuminated areas undergoes this photoconsumption process, and a phosphorescent pattern in shape of the mask becomes visible. The oxygen barrier becomes more permeable at elevated temperatures, allowing an oxygen refill of the functional layer by heating the device. This resets the device and it can be rewritten after a short cooling phase.