Fluorescence intensity ratio optical thermometer YNbO4: Pr3+, Tb3+ based on intervalence charge transfer

Fluorescence thermometers: intermediation of fundamental temperature and light

“…In particular, FTs with BW-II emissions can allow a high penetration depth and high spatial resolution in subcutaneous tempera- ture imaging. [186][187][188] The potential of active-core/active-shell Nd 3+ and Yb 3+ -doped nanoparticles for thermal estimation operating in subcutaneous tissues was evaluated. 186 Yb 3+ and Nd 3+ are excited by only one excitation (790 nm) owing to the energy transfer from Nd 3+ ( 4 F 3/2 ) to Yb 3+ ( 2 F 5/2 ).…”

Optical analysis of Sr3Gd(PO4)3:Pr3+ phosphors for lighting applications

“…Among the tri‐valent RE ions, the praseodymium (Pr 3+ ) ion has significant applications in lighting, displays, scintillators, medical, agriculture and industrial fields due to its 4f 2 → 4f 2 intra‐configurational and 4f 1 5d 1 → 4f 2 inter‐configurational emission transitions. [ 16–20 ] The Pr 3+ ions are capable of exhibiting different colours of emission originating from 3 P 0,1 and 1 D 2 emission states depending upon the crystal field environment around it in different host matrices. They produce green luminescence through 3 P 0,1 → 3 H 4 transition under 306 nm excitation from Gd 2 O 2 S: Pr 3+ phosphor, [ 21 ] blue‐green luminescence through 3 P 0 → 3 H 4 transition under 449 nm excitation from Pr 3+ − doped GdAlO 3 phosphor, [ 22 ] red or reddish‐orange luminescence through 1 D 2 → 3 H 4 and 3 P 0 → 3 H 6 transitions under 452 and 489 nm excitations from Pr 3+ ‐doped Li 2 SrSiO 4 phosphor.…”

“…4f 2 inter-configurational emission transitions. [16][17][18][19][20] The Pr 3+ ions are capable of exhibiting different colours of emission originating from 3 P 0,1 and 1 D 2 emission states depending upon the crystal field environment around it in different host matrices. They produce green luminescence through 3 P 0,1 !…”

Improved relative temperature sensitivity of over 10% K−1 in fluoride nanocrystals via engineering the interfacial layer

“…Based on the temperature-dependent LIR variations of Er (650 nm) to Nd (800 nm), the maximum S r of 10.01% K −1 and minimum S r of 2.56% K −1 were achieved under 980 nm laser excitation, which are much better than those of most previously reported TCL-based temperature sensing probes. 26–29…”

“…Based on the temperature-dependent LIR variations of Er (650 nm) to Nd (800 nm), the maximum S r of 10.01% K À1 and minimum S r of 2.56% K À1 were achieved under 980 nm laser excitation, which are much better than those of most previously reported TCLbased temperature sensing probes. [26][27][28][29] Under 980 nm laser excitation, the near infrared UC emission peaking at B800 nm corresponding to the Nd 3+ : 4 F 5/2 -4 I 9/2 transition can be achieved through phonon-assisted energy transfer from Yb 3+ to Nd 3+ (Fig. S1, ESI †).…”