Nanosecond kinetics of multiphoton upconversion in an optically trapped single microcrystal

Abstract

Recently, erbium-doped nanomaterials have been demonstrated to achieve multiband upconversion luminescence (UCL) via high excitation power and material alteration. In such a scenario, a large number of energy levels of...

The impact of Yb3+ concentration on multiband upconversion in a single NaYF4:Yb/Er microcrystal determined via nanosecond time-resolved spectroscopy

“…Commonly, in Yb/Er systems the populating process operates through pathway A (A-1, A-2, A-3, A-4, and nRP) and pathway B (B-1, B-2, B-3, B-4 and nRP), with B-3 happening after A-4. 27 But when Yb doping concentration is high, B-4 ( 2 H 9/2 → 2 D 5/2 ) happens superior to B-3 ( 4 F 9/2 → 2 H 9/2 ) because 2 H 9/2 accumulates abundant electrons due to the enhancement of pathway A-3 and the following nRP. Furthermore, we have investigated the decay processes at different Yb 3+ doping concentrations (as shown in Error!…”

“…Previously, we had developed a sophisticated Please do not adjust margins Please do not adjust margins experimental setup called optically trapping time-resolved photoluminescence spectroscopy (OT-TRPLS), which combines a 1342-nm optical tweezer 25,26 and an advanced time-resolved photoluminescence device with a 976-nm excitation nanosecond-pulsed (ns-pulsed) laser. 27 This allows for measuring the transient spectra at a nanosecond timescale while trapping the single MC to avoid the anisotropy from the movement of the measured MC itself [28][29][30] and interactions from surrounding MCs. 31 In this work, we systematically investigate the impact of Yb 3+ concentration on the multiband emissions in a single optically trapped NaYF 4 :Yb/Er MC through the OT-TRPLS platform.…”

“…Previously, we had developed a sophisticated experimental setup called optical trapping time-resolved photoluminescence spectroscopy (OT-TRPLS), which combines a 1342 nm optical tweezer 25,26 and an advanced time-resolved photoluminescence device with a 976 nm excitation nanosecond-pulsed (ns-pulsed) laser. 27 This allows for measuring the transient spectra at a nanosecond timescale while trapping a single MC to avoid the anisotropy from the movement of the measured MC itself 28–30 and interactions from the surrounding MCs. 31…”

The effect of Er3+ concentration on the kinetics of multiband upconversion in NaYF4:Yb/Er microcrystals

“…Moreover, an advanced setup is needed to better understand the kinetics of β-NaYF 4 :Yb 3+ /Er 3+ systems with different Er 3+ doping concentrations at nanosecond timescale. Optical trapping time-resolved photoluminescence spectroscopy (OT-TRPLS) combines a nanosecond pulsed laser (976 nm), an optical tweezer (with 1342 nm laser), and an advanced time-resolved photoluminescence device (Huang et al, 2022a). It has the ability to measure the nanosecond timescale transient spectra by trapping a single MC to deter the effect resulting from the MC movement and its interactions with other surrounding MCs.…”