2023
DOI: 10.1021/acs.jpcc.3c05695
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Plasmon Enhancement of the Hot-Band Absorption-Assisted Anti-Stokes Photoluminescence of Near-Infrared Dyes

Oleg Dimitriev,
Ryohei Yamakado,
Ayumu Nagaoka
et al.

Abstract: Plasmon enhancement of the hot-band absorption-assisted anti-Stokes photoluminescence is a nontrivial task because of the specific mechanism of electronic excitation of an emitter that occurs through population of its vibrational energy levels. Here, we compare the interaction of two related near-infrared dyes that possess the same chromophores and terminal groups but different meso-groups, with plasmonic silica-coated gold nanorods (Au@SiO 2 ) and mesoporous silica-coated copper sulfide nanoparticles (Cu 2−x … Show more

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“…This reflects the phenomenon of spectral broadening caused by enhanced anti-Stokes thermal repopulation near the absorption tail. 25,38 Therefore, the temperature-dependent excitation spectrum provides solid and primary experimental evidence for the temperature dependent PL characteristics determined by the excitation wavelength in this case, precisely due to the effective excitation at the low-energy tail with the broadening of hot-band absorption due to thermal vibration, resulting in the enhancement of anti-thermal quenching of the PL intensity.…”
Section: Resultsmentioning
confidence: 95%
“…This reflects the phenomenon of spectral broadening caused by enhanced anti-Stokes thermal repopulation near the absorption tail. 25,38 Therefore, the temperature-dependent excitation spectrum provides solid and primary experimental evidence for the temperature dependent PL characteristics determined by the excitation wavelength in this case, precisely due to the effective excitation at the low-energy tail with the broadening of hot-band absorption due to thermal vibration, resulting in the enhancement of anti-thermal quenching of the PL intensity.…”
Section: Resultsmentioning
confidence: 95%