Fig. 8: Demonstration of the security writing application. | Communications Chemistry

Fig. 8: Demonstration of the security writing application.

From: Axial chirality-induced rigidification in aminoboranes enhances persistent room-temperature phosphorescence and circularly polarized luminescence

Fig. 8: Demonstration of the security writing application.

Luminescence photographs of pRTP samples with UV-340 nm irradiation and after removal of irradiation (a) 1 wt% R-(BN)2 in PMMA (b) 1 wt% (BN)1 in PMMA; c Demonstration of security writing using ink formulated from 1 wt% R-(BN)₂ or (BN)₁ in PMMA. (Background reflections under UV illumination were removed to enhance clarity) (d) Chromaticity diagram for 1 wt % in PMMA doped films of R-(BN)2 and (BN)1.The samples are showing identical fluorescence, yet the chiral framework induced brighter phosphorescence and prolonged afterglow at 298 K in N2 atmosphere.

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