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10 March 2020 Rewritable luminescent tags using room-temperature phosphorescence (RTP) (Conference Presentation)
Max Gmelch, Heidi Thomas, Felix Fries, Tim Achenbach, Sebastian Reineke
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Proceedings Volume 11277, Organic Photonic Materials and Devices XXII; 1127707 (2020) https://doi.org/10.1117/12.2541863
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Organic room temperature phosphorescence (RTP) is used to realize rewriteable (>40 cycles), transparent and flexible optical tags with high resolution (>700 dpi). The devices contain an organic biluminescent emitter doped into polymethylmethacrylate (PMMA). They show phosphorescence, which in general is quenched by molecular oxygen. However, by illuminating with ultraviolet light (365 nm), this molecular oxygen locally vanishes at the irradiated area, enabling RTP at defined spots. Further, by illuminating with infrared light, the system can be refilled with oxygen leading to quenching of the RTP again. Therefore, any luminescent pattern can be written into and erased from the tag using light only.
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Max Gmelch, Heidi Thomas, Felix Fries, Tim Achenbach, and Sebastian Reineke "Rewritable luminescent tags using room-temperature phosphorescence (RTP) (Conference Presentation)", Proc. SPIE 11277, Organic Photonic Materials and Devices XXII, 1127707 (10 March 2020); https://doi.org/10.1117/12.2541863
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KEYWORDS
Oxygen
Phosphorescence
Ultraviolet radiation
Coating
Data storage
Infrared radiation
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