Controlling Photon Avalanche Upconversion in Nanoparticles toward Frontier Applications

ACS Applied Optical Materials, Journal Year: 2024, Volume and Issue: 2(9), P. 1841 - 1853

Published: Sept. 16, 2024

Language: Английский

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Upconversion/Downshifting Circularly Polarized Luminescence over 1200 nm in a Single Nanoparticle for Optical Anticounterfeiting and Information Encryption

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 7, 2024

Abstract Multimodal upconversion and downshifting circularly polarized luminescent materials hold significant potential for optical anticounterfeiting applications due to their exceptional chiroptical properties. However, constructing these within a single emitter remains challenging. In this study, conceptual model of multimodal upconversion/downshifting luminescence (CPL) is realized nanoparticle. A new type nanoparticles with multilayer core–shell architecture fabricated, capable delivering luminescence, when excited by 980 nm laser. Utilizing co‐assembly strategy, CPL emission, covering broad emission range from ultraviolet (UV) the second near‐infrared (NIR‐II) region, can be at supramolecular level. These properties closely follow chirality host matrix are strongly dependent on distribution mode films. The behavior enabled cutting‐edge encryption including information encryption. This work introduces novel approach designing opens avenues development functional materials.

Language: Английский

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Significantly Boosted Upconversion Emission in Cryogenic Er@Yb@Y Core–Shell–Shell Nanostructures

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 12(5)

Published: Sept. 28, 2023

Abstract Recent advances reveal that due to the cross‐relaxation restriction, impressive upconversion (UC) enhancement (≈100‐folds) can be achieved in cryogenic Er 3+ ‐rich core‐inert shell nanostructures (e.g., NaErF 4 @NaYF ), which opens up exciting opportunities diverse frontier applications. However, further promotion of UC intensity is still highly desired, rational design play a key role. Herein, it demonstrated adopting an active will constantly benefit within wide temperature range (40–300 K). Specifically, through constructing luminescent core@active shell@inert sandwich nanostructure @NaYbF 8.3–73‐folds (taking corresponding core@inert structures as competitors). Moreover, from spectral‐domain and time‐domain spectroscopic experiments, relevant convincingly attributed temperature‐dependent energy injection process (from core). More interestingly, unique property material makes temperature‐induced high‐level encryption application possible, obtained by employing nanomaterials on quick response (QR) code. These results not only deepen mechanism multi‐layer nanostructures, but also introduce expanded dimension (via low temperatures) information security.

Language: Английский

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Construction of active-inert core–shell structured nanocrystals for broad range multicolor upconversion luminescence

Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)

Published: March 26, 2024

Abstract Rare earth doped up-conversion luminescent nano-materials exhibit abundant emission colors under suitable excitation condition. In this work, NaYF 4 :Er/Ho@NaYF and NaYbF :Tm@NaYF nanoparticles were synthesized by co-precipitation method. The pure red can be realized the designed nanocrystals R/Gs reach 23.3 25 excitations of 980 1550 nm lasers, respectively. R/G declines as power increasing with color changing from to yellow, which is due quick saturation energy levels, radiating emissions. Meanwhile, intensity increases 58.3 folds after encasing inert shell CIE coordinate reaches (0.1646, 0.0602) laser excitation. Furthermore, broad range multicolor blue yellow emissions achieved mixing nanocrystals, could applied colorful displaying, security anti-counterfeiting information coding.

Language: Английский

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Multi-mode up-conversion emission of Tm@Yb@Er phosphors for color modulation and thermometry

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1003, P. 175715 - 175715

Published: July 26, 2024

Language: Английский

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