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Multi-wavelength excited triplet-triplet upconversion microcrystals based on hot-band excitation for optical information encryption. | LitMetric

Multi-wavelength excited triplet-triplet upconversion microcrystals based on hot-band excitation for optical information encryption.

Phys Chem Chem Phys

Research Center for Green Printing Nanophotonic Materials, Suzhou Key Laboratory of New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.

Published: August 2023

AI Article Synopsis

Article Abstract

Multi-wavelength hot-band excitation, forbidden in the conventional Stokes fluorescence mechanism, is found to be available with cascading triplet-triplet annihilation upconversion (TTA-UC). Selective excitation of Pt(II)octaethylporphyrin (PtOEP) by diode lasers with wavelengths of 532 nm, 589 nm, 635 nm, 655 nm, and 671 nm respectively can all induce 9,10-diphenylanthracene (DPA) to emit blue upconversion, with the maximum anti-Stokes shift of 0.95 eV in the microcrystals exposed to air. Whether the zero-vibrational energy level excitation or the hot-vibrational energy level excitation in the ground state, the PtOEP/DPA pair showed triplet-triplet energy transfer (TTET) efficiencies approaching ∼95%. The doped microcrystal samples without encapsulation can emit blue upconversion from green/yellow/red excitation with stability for ∼20 days under atmospheric conditions, demonstrating their potential applications in multiple information encryption.

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Source
http://dx.doi.org/10.1039/d3cp02199hDOI Listing

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