Energy Migration Layer Modulated Lanthanide Luminescent Nanoparticles Toward Multimode Ratio Fluorescence Thermometers

Abstract

Fluorescent temperature sensing is considered as a research hotspot in the fields of life sciences and medicine. Despite the existence of numerous materials, the low sensitivity still limits their broader application. Herein, a core‐shell‐shell structure of lanthanide‐doped nanoparticles is designed, which can adjust the energy transfer process by controlling the Yb3+ concentration in the energy migration layer, so as to generate different but regular visible upconversion and near‐infrared downshifting emission modes depending on 808 or 980 nm excitation wavelengths. And the energy migration, cross relaxation, and energy cycling processes involved in energy migration ions are analyzed and summarized. Subsequently, unlike traditional thermal coupled fluorescence thermometers, the visible and near‐infrared emission under different excitations is selected as the fluorescence intensity ratio by combining both thermal quenching and enhancement. Thus, a new type of fluorescence thermometer with deep penetration capability and high sensitivity within the biological temperature range is obtained, which can inspire a new design strategy for the future biosensing field.

Photon upconversion of Nd3+–Yb3+–Tb3+ doped core–shell–shell–shell nanoparticles

“…In addition, in CSSS UCNPs, the lifetime at 543 nm (Tb 3+ 5 D 4 level) increased with increasing Yb 3+ doping concentration in the Yb-layer (Fig. S6†), which was consistent with the energy cycle (EC) process between Yb 3+ ions, 44 indicating that the EC process was a pathway leading to energy loss.…”

Engineering Visible to Near-Infrared Luminescence through a Selective Doping Strategy for High-Performance Temperature Sensing

“…The results in Figure a,b clearly indicate that the LIR is well-fitted to eq . Based on previous reports, two crucial parameters, absolute sensitivity ( S a ) and relative sensitivity ( S r ), are typically employed to precisely evaluate the thermal sensitivity characteristics across various thermometers, which can be determined using the following expression , S a = | d LIR italicdT | = a 0.25em exp ( − b T ) × b T 2 S r = | 1 LIR d LIR dT | = b T 2 The S r values calculated via eq are illustrated in Figure c. These models result in S r values of 1.30% K –1 ( I 655 / I 545 ) and 1.12% K –1 ( I 545 / I 525 ) at 313 K. It is noteworthy that the maximum S r values obtained exceed those recently reported for luminescent thermometers based on Er 3+ doping materials. − Furthermore, temperature resolution (δ T ) is a vital parameter for luminescent thermometers, which is defined as δ T = 1 S normalr δ LIR LIR where δLIR/LIR signifies the relative uncertainty of thermometric parameter readings.…”

Toward Ultra-High Sensitivity Optical Thermometers and Bright Yellow LEDs Based on Phonon-Assisted Energy Transfer in Rare Earth-Doped La2ZnTiO6 Double Perovskite

“…In the UC luminescence, the most favorite combination is Yb 3+ and Er 3+ because Yb 3+ has a large absorption cross section at 980 nm, which is a low-cost sensitizer, and Er 3+ is rich in energy levels in the visible region and has a small number of mismatches with the energy levels of Yb 3+ , so that the combination of Yb 3+ and Er 3+ usually gives a better UC luminescence. ,, Again, the effect obtained can be even better if a host of double perovskite structural material is chosen for it. As shown in Figure c, under 980 nm laser excitation, the LZTO: x% Yb 3+ , 1% Er 3+ phosphor exhibits surprising UC emission in the visible region.…”