Abstract:Temperature dependent emission spectra and decay times of trivalent dysprosium (Dy3) activated Y4Al2O9 (YAM) crystals have been studied for the first time (to our knowledge). The ratio of emission lines intensity can be used in temperature measurements, as it is not dependent on the variability of absolute intensity. The Boltzmann model was applied for modeling the temperature variation of the 4I15/2 and 4F9/2 states emissions relative intensities 455 and 481 nm, respectively. The calculated approximation give… Show more
“…For example, the absolute sensitivity in Eu 3+ doped Gd 2 Ti 2 O 7 phosphor was 0.015 K −1
41 , and in Dy 3+ doped GdVO 4 phosphor was 0.01 K −1
42 . The maximum relative sensitivity of 1.71% K −1 is obtained at 335 K. It is higher than the reported phosphors, 0.014 K −1 in Eu 3+ doped CaGd 2 (WO 4 ) 4 scheelite 43 and 0.003 °C −1 in Dy 3+ doped Y 4 Al 2 O 9 phosphor 44 . The improvement of both the relative sensitivity and absolute sensitivity of this material may be owing to different energy transfer ratio from charge transfer bands to Eu 3+ -Dy 3+ ions at different temperatures, leading to a significant change in the emission intensity ratio.Figure 9( a ) Experimental measured and fitted plots of FIR (I 572 /I 615 ) versus temperature.…”
Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu3+-Dy3+ ions is proposed. A series of Eu3+/Dy3+ co-doped SrWO4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm), fluorescence color, lifetime decay curves of Dy3+ (572 nm) and Eu3+ (615 nm), and relative and absolute sensitivities of Eu3+/Dy3+ co-doped SrWO4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy3+ and Eu3+ ions. In this host, the maximum relative sensitivity Sr can be reached at 1.71% K−1, being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.
“…For example, the absolute sensitivity in Eu 3+ doped Gd 2 Ti 2 O 7 phosphor was 0.015 K −1
41 , and in Dy 3+ doped GdVO 4 phosphor was 0.01 K −1
42 . The maximum relative sensitivity of 1.71% K −1 is obtained at 335 K. It is higher than the reported phosphors, 0.014 K −1 in Eu 3+ doped CaGd 2 (WO 4 ) 4 scheelite 43 and 0.003 °C −1 in Dy 3+ doped Y 4 Al 2 O 9 phosphor 44 . The improvement of both the relative sensitivity and absolute sensitivity of this material may be owing to different energy transfer ratio from charge transfer bands to Eu 3+ -Dy 3+ ions at different temperatures, leading to a significant change in the emission intensity ratio.Figure 9( a ) Experimental measured and fitted plots of FIR (I 572 /I 615 ) versus temperature.…”
Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu3+-Dy3+ ions is proposed. A series of Eu3+/Dy3+ co-doped SrWO4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm), fluorescence color, lifetime decay curves of Dy3+ (572 nm) and Eu3+ (615 nm), and relative and absolute sensitivities of Eu3+/Dy3+ co-doped SrWO4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy3+ (572 nm) and Eu3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy3+ and Eu3+ ions. In this host, the maximum relative sensitivity Sr can be reached at 1.71% K−1, being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.
“…Among many reported RE ions doped materials for temperature sensing based on the change of fluorescence intensity ratio (FIR) of two thermally-coupled energy levels (TCELs) with temperature [3,[12][13][14][15][16][17][18][19], Eu 3 þ , Ho 3 þ and Tm 3 þ have TCELs with energy differences over 1500 cm À 1 , which could lead to thermal decoupling at low temperature. While the energy differences of TCELs of Yb 3 þ and Pr 3 þ are too small, which go against high temperature sensitivity.…”
“…Furthermore, Xu et al mentioned that strong green UC emissions can be observed in Er doped (Ba 0.99 Ca 0.01 )(Ti 0.98 Zr 0.02 )O 3 ceramics [23]. Compared with glasses and fluorides [24][25][26], ferroelectrics have superior physical, chemical and thermal stabilities. Also, excellent temperature sensing properties have been obtained in RE doped ferroelectrics [5,27].…”
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