Blue-LED-excitable NIR-II luminescent lanthanide-doped SrS nanoprobes for ratiometric thermal sensing

Efficient Near‐Infrared Luminescence in Lanthanide‐Doped Vacancy‐Ordered Double Perovskite Cs2ZrCl6 Phosphors via Te4+ Sensitization

“…Such a temperature evolution in PL intensities and PL lifetimes of Er 3+ and Yb 3+ was different from that of Nd 3+ in Cs 2 ZrCl 6 : Te 4+ /Nd 3+ MCs, where the PL intensity and PL lifetime of Nd 3+ declined evidently with the temperature rise due to the accelerated nonradiative relaxation of Nd 3+ (Figure S19). This implies that the ET from Te 4+ to Er 3+ (and Yb 3+ ) in Cs 2 ZrCl 6 : Te 4+ /Er 3+ (Yb 3+ ) MCs was assisted by the lattice phonons [11b] . In view of the fact that there is spectral overlap between the emission of Te 4+ and the absorption of Er 3+ at 522 nm ( 4 I 15/2 → 2 H 11/2 ) and Nd 3+ at 578 nm ( 4 I 9/2 → 2 G 7/2 ) (Figure S20), we deduced that the ET from Te 4+ to Er 3+ and Nd 3+ occurred as follows (Figure 4f): upon excitation at 392 nm, Te 4+ ion was excited from 1 S 0 to 3 P 1 , which experienced a dynamic Jahn–Teller distortion and gave rise to the broadband yellow emission of Te 4+ at 575 nm through the 3 P 1 → 1 S 0 transition; meanwhile, part of the excitation energy was transferred from the relaxed 3 P 1 state of Te 4+ to the well‐matched 2 H 11/2 level of Er 3+ and 2 G 7/2 level of Nd 3+ , followed by nonradiative relaxation to 4 I 13/2 of Er 3+ and 4 F 3/2 of Nd 3+ , respectively, which generated the intense NIR emissions.…”

A sandwiched luminescent heterostructure based on lanthanide‐doped Gd2O2S@NaYF4 core/shell nanocrystals

“…[1][2][3][4][5][6][7] Various materials have been explored for Ln 3+ doping to achieve efficient upconversion luminescence (UCL) and downshifting luminescence (DSL), including fluoride, oxide, sulfide, and oxysulfide. [8][9][10][11][12][13][14] Among these candidates, lanthanide oxysulfides have attracted particular attention because of their outstanding photochemical properties inheriting from both oxides and sulfides, such as large absorbance, tun-able bandgap, and high photoluminescence (PL), thermoluminescence, and X-ray-excited luminescence efficiency, which make them extremely useful in light-emitting diodes (LEDs), X-ray scintillators, optical storage, and solid-state lasers. [15][16][17][18][19][20] Specifically, Gd 2 O 2 S: Er 3+ bulk phosphor has been demonstrated to be more efficient than the benchmark β-NaYF 4 : Er 3+ in UCL.…”

Mechanically excited thermometry in erbium ions

“…For instance, monitoring how cell temperature changes can inform about cellular metabolism, because metabolic processes are closely associated with temperature [6]. For quick and accurate temperature estimation, several methods have been proposed, including thermocouples, thermal resistor-based devices, and thermal imagery devices [7][8][9]. Among these approaches to temperature sensing, luminescence-based optical thermometry has garnered significant attention during the past few decades, owing to its unique advantages such as non-invasiveness, short response time, and high spatiotemporal resolution [10][11][12].…”