The impact of Eu 3+ concentration on charge transfer and f–f transitions in KLa 1−x Eu x P 4 O 12 nanocrystals

Marciniak, Ł.; Guyot, Y.; Hreniak, D.; Stręk, W.

doi:10.1016/j.jlumin.2015.08.053

Cited by 11 publications

(3 citation statements)

References 41 publications

(42 reference statements)

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“…This is the result of the aforementioned lower emission intensity resulting from ESA stimulation of Tb 3+ ions than the emission resulting from efficient GSA stimulation of Eu 3+ ions. The higher the concentration of Eu 3+ ions, the higher is the relative intensity of the Eu 3+ band because the absorption cross section increases, and 5% is not yet the amount of the dopant at which in tetraphosphates a significant concentration quenching of luminescence takes place . Temperature elevation activates the changes in the intensity of emission of both ions.…”

Section: Resultsmentioning

confidence: 99%

“…30 The Tb 3+ ions are eightfold coordinated by O 2− ions, and they can be substituted by Eu 3+ and Cr 3+ ions as was previously shown. 31,32 The favorable properties of the tetraphosphates as a host material for optically active ions result from the fact that the crystallographic positions occupied by Tb 3+ , Eu 3+ , or Cr 3+ are strongly separated from each other (by around 0.6544 nm), 34 as shown in Figure 2a, which significantly reduce the probability of the luminescence concentration quenching process. 24 The used co-precipitation method of synthesis allows for simple preparation of nanocrystallites, showing a certain degree of agglomeration and size distribution as presented in the transmission electron microscopy (TEM) image in Figure 2b.…”

Section: Resultsmentioning

confidence: 99%

“…The higher the concentration of Eu 3+ ions, the higher is the relative intensity of the Eu 3+ band because the absorption cross section increases, and 5% is not yet the amount of the dopant at which in tetraphosphates a significant concentration quenching of luminescence takes place. 35 Temperature elevation activates the changes in the intensity of emission of both ions. When the temperature is increased from 0 to 200 °C, an enhancement of the emission intensity of Tb 3+ ions is observed in each case; however, the greater the enhancement, the lower is the concentration of Eu 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

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Excited State Absorption for Ratiometric Thermal Imaging

Drabik

Marciniak

2020

ACS Appl. Mater. Interfaces

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Luminescence thermometry, an alternative to thermal imaging using the thermovision technique, requires the development of new approaches and a thorough understanding of the physical phenomena involved, in order to improve the temperature readout parameters. A phenomenon that has recently been shown to cause an extremely strong increase in the emission intensity for the temperature elevation is the thermally induced excited state absorption. This work demonstrates that taking advantage of the strong thermal dependence of the thermally induced excited state absorption process, the limitation associated with the two thermally coupled excited levels usually involved in the ratiometric temperature readout can be overcome, improving the thermometric properties of the luminescent thermometer. The same excitation wavelength was used to induce the emission resulting from the thermally induced excited state absorption of the Tb3+ ions and ground-state absorption of the other type of co-dopant ions causing the opposite nature of the thermal dependence of their emission intensities. Moreover, thanks to the strong color changes exhibited by the phosphors, it was possible to demonstrate the applicability of the proposed approach for through-object 2D thermal imaging of a microelectronic printed circuit board covered with a glass plate using an ordinary commercial digital camera, where the thermovision camera fails.

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Section: Resultsmentioning

confidence: 99%