Up-conversion luminescent properties and optical thermometry of LaMgAl11O19: Yb3+/Er3+ phosphors

Sensitivity of a Nanocrystalline Luminescent Thermometer in High and Low Excitation Density Regimes

“…Table presents the comparison of sensitivity for different luminescent thermometers which exploited the thermally dependent LIR of Er 3+ ions. − ,− As it can be noticed, the sensitivity obtained for LiYbP 4 O 12 :0.1%Er nanocrystals at pulsed excitation is almost two times higher than the highest previously reported value. However, the experimental conditions to determine the temperature sensitivity are usually not available in scientific reports, which make such comparisons hindered or meaningless.…”

“…Optical remote thermometers based on luminescent nanoparticles doped with rare-earth ions have been studied extensively owing to their potential applications in many fields of science, biomedicine, and technology. − Although sufficient sensitivity (up to 1.5% K –1 ), satisfying sensing range (10–500 K), ,− and simple readout in vis (540 nm) or NIR (900–1100 nm) spectral regions have been demonstrated, the impact of experimental conditions, in particular, excitation intensity, on these key features has been disregarded so far. The studies carried out within the current framework show the critical importance of the excitation scheme on both sensitivity and sensing range of luminescent thermometers based on Yb and Er upconverting phosphor.…”

Optical temperature sensor based on upconversion luminescence of Er3+ doped GdTaO4 phosphors

“…From the obtained results, it was clearly observed that the S A curves are very similar under excitations of 980 and 1550 nm lasers. Meanwhile, it can also be found that the maximum S A is up to 0.0041 K −1 when the sample temperature is 475 K. Compared with the maximum S A of Er 3+ /Yb 3+ co‐doped Gd 2 O 3 phosphor (0.0039 K −1 ), 27 Er 3+ /Yb 3+ co‐doped silicate glass (0.0033 K −1 ), 28 Er 3+ /Yb 3+ co‐doped CaLaAl 3 O 7 phosphor (0.0035 K −1 ), 29 and Yb 3+ /Er 3+ co‐doped LaMgAl 11 O 19 phosphor (0.0027 K −1 ), 30 the S A of Er 3+ ‐doped GdTaO 4 phosphor has been improved. According to the above S A curves, the relevant S R curves were calculated by the Equation (), as presented in Figure 6D.…”

Combustion Synthesis of Some Cr3+-Activated Aluminate Phosphors

“…After the first report on lasing in Nd 3+ -activated LMA [41], many efforts were devoted to the Cr 3+ doped LMA because it was thought to be a good substitute for alexandrite [43]. Apart from applications like solid state lasers and various phosphor related applications, LMA has been proposed for number of other applications in industry, military and scientific research, which include dielectric resonators [44], combustion catalyst support, and thermal barrier coatings [45]. LMA shows low thermal conductivity due to its complicated crystal structure and plate-like grains.…”