Optical thermometry based on fluorescence intensity ratio of Dy3+-Doped oxysilicate apatite warm white phosphor

Diffuse reflectance and photoluminescence spectroscopic investigations of Sr2RE8(SiO4)6O2 (RE = rare earth) apatites

“…All these bands agree well with the experimental data published by Carnall et al [28]. Also, similar results were obtained employing PLE spectroscopy for Dy 3+ -doped Ca 2 Y 8 (SiO 4 ) 6 O 2 [33] and Ca 2 La 8 (GeO 4 ) 6 O 2 [30], and using DRS for Ca 2 La 8 (SiO 4 ) 6 O 2 :Dy 3+ [39]. Figure 1(i) exhibits the DRS spectrum for Sr 2 Y 8 (SiO 4 ) 6 O 2 ; as expected for Y 3+ , there are no f-f transitions.…”

“…The lower CTB energy for Yb-apatite can also be justified by the 4f 13 electronic distribution of Yb 3+ , which can capture an electron more easily from the O 2and achieve a more stable configuration 4f 14 [44]. Liu et al [39] related a CTB position for CaLa 4 (SiO 4 ) 3 O:Dy 3+ at about 250 nm, which is comparable to the result found in this work for Dy-apatite.…”

“…Thereby, plotting n [ ( ) ] F R h n 1 versus hν, the E g value can be extracted applying the method developed by Wood and Tauc [24,27]. In this work, the experimental direct band gaps (n = 1/2) were calculated for all samples, in agreement with previous works [31,39,40,45,46]. The normalized plots of n [ ( ) ] F R h n 1 versus hν are shown in figure 6, where the intercepts of the linear parts of the functions with x-axis give the band gap energiey (E g = hν).…”

Ratiometric detection of I− using a dysprosium-based metal–organic framework with a single emission center

“…[38][39][40] However, the dual emission from the thermal coupling energy levels of Dy 3+ ( 4 I 15/2 and 4 F 9/2 ) is commonly used for temperature sensing. 41,42 However, dysprosium-based MOF has never been reported as a ratiometric fluorescence sensor for the detection of pollutants in water.…”

Designing dual-emission phosphors for temperature warning indication and dual-mode luminescence thermometry

“…7,8 Fortunately, temperature-dependent LIR and decay lifetime methods can avoid many requirements. 9–11 Particularly, as for LIR thermometry based on dual-emission centers, this temperature measurement technique does not depend on the bandwidth of the rare earth thermally-coupled energy level, and it can also be used for optical temperature measurement. 12–14 Although the current LIR temperature measurement technology based on luminescent materials is relatively mature, high sensitivity in the wide temperature range still remains a challenge, restricting further application.…”