From quencher to potent activator – Multimodal luminescence thermometry with Fe³⁺ in the oxides MAl₄O₇ (M = Ca, Sr, Ba)

Abstract

Luminescence (nano)thermometry is an emerging and promising field for remote temperature sensing and thermal imaging of both the surface and interior of objects. While the field is dominated by trivalent...

How to calibrate luminescent crossover thermometers: a note on “quasi”-Boltzmann systems

“…Given the high non-radiative coupling rates k nr (0) between the 4f 5 5d 1 - and 4f 6 -based levels, thermal quenching of the luminescence is a serious problem at high temperatures (see also Fig. 3), as was already demonstrated several times for transition metal ions by the Marciniak group 64,65 or in dual-centre luminescent thermometers by e.g. Kaczmarek et al .…”

Highly efficient Fe3+-doped A2BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis

“…Thus, its optical properties are worth exploring. Although the luminescence of Fe 3+ with intraconfigurational d–d transitions has been reported, the emission commonly occurs in the red and far-red light regions depending on the local environment of Fe 3+ in the host materials 22 – 26 . Almost no Fe 3+ -doped phosphors exhibit NIR emission exceeding 800 nm, except for the recently reported CaAl 12 O 19 :Fe 3+ (808 nm), SrAl 12 O 19 :Fe 3+ (811 nm), and CaGa 2 O 4 :Fe 3+ (809 nm) 27 – 29 .…”

Broadband near-infrared luminescence from Fe3+-activated NaScSi2O6 phosphors for luminescence thermometry and night-vision applications

“…As far as we know, several Fe 3+ -activated phosphors have been developed for broadband NIR emitting phosphor applications and luminescence thermometry. [12][13][14] The luminescence of Fe 3+ ions based on intra-configurational d-d transitions is strongly dependent on the local environment. Besides, the high susceptibility of the Fe 3+ emission intensity to temperature changes enables the development of highsensitive luminescent thermometers operated in the first biological transparency window.…”