YVO_4:Er^3+/Yb^3+ phosphor for multifunctional applications

Abstract

This article reports luminescence studies on wet-chemical route prepared YVO 4 :Er 3 ∕Yb 3 microdisc phosphor. The 980 nm laser excited upconversion (UC) emission intensity ratio of green to red bands is found too high to neglect the contribution from the red emission band, which is not observed normally in Er 3 ∕Yb 3 -doped materials. The red emission is also found absent in the downconversion emission under excitation at 316 nm. The variation of UC intensities with external temperature exhibits a well-fashioned pattern, which suggests that the 2 H 11∕2 and 4 S 3∕2 levels of Er 3 ion are thermally coupled. The YVO 4 :Er 3 ∕Yb 3 phosphor has shown outstanding temperature-sensing behavior with maximum sensitivity of 0.0117 K −1 at 400 K. This material is also employed to develop a latent fingerprint in green color. Furthermore, the present phosphor could be useful for solar cell concentrators, drug delivery, and disease therapy applications.

Incorporation of Zn2+ ions into BaTiO3:Er3+/Yb3+ nanophosphor: an effective way to enhance upconversion, defect luminescence and temperature sensing

“…The bright field TEM micrograph of the three samples is shown in Fig 5(d-f) with their selected area electron 30 diffraction (SAED) patterns in the inset. 6a), 50 the bands are observed at 455, 488, 541, 648 and 978 nm. The particles are appearing to be connected through grain boundaries.…”

“…Figure 3 (a-c) reflects that the slope is changed on Zn-incorporation. 50 The increase in strain with Zn addition reflects the increase of resultant distortion because of doping [32]. The tensile strain increases with the addition of Zn-content.…”

“…The minute incorporation of RE ions in barium titanate can extend its functionality towards 45 phosphor based applications including field emission displays, light emitting devices, remote temperature sensors, and security purposes. The structural information of this material can also be easily 50 obtained by monitoring the luminescence through doping of small quantity of RE ions [14]. The structural information of this material can also be easily 50 obtained by monitoring the luminescence through doping of small quantity of RE ions [14].…”

Demonstration of Temperature Dependent Energy Migration in Dual-Mode YVO4: Ho3+/Yb3+ Nanocrystals for Low Temperature Thermometry

“…The investigation performed in the current framework shows the importance of this material not only as a dual mode luminescent material but also as an excellent candidate for optical thermometry. Accurate temperature sensing in a non-invasive way is one of the most interesting and demanding applications because of its superiority over conventional contact based thermometers181920. In general, the temperature sensing of rare earth doped materials is determined by two commonly used methods i. e. decay time method and fluorescence intensity ratio (FIR) technique.…”

Enhanced temperature sensing response of upconversion luminescence in ZnO–CaTiO3: Er3+/Yb3+ nano-composite phosphor

“…Temperature sensing capability of the nano-composite phosphor is studied using fluorescence intensity ratio (FIR) technique [36]. The emission intensity of ions from specific energy levels in excited state depends upon a number of parameters like host material, the particular energy level of interest, etc.…”