Post annealing induced manipulation of phase and upconversion luminescence of Cr<sup>3+</sup> doped NaYF<sub>4</sub>:Yb,Er crystals

Nannuri, Shivanand H.; Kulkarni, Suresh D.; Karumuthil, Subash Cherumannil; Chidangil, Santhosh; George, Sajan D.

doi:10.1039/c9ra00115h

Cited by 20 publications

(10 citation statements)

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“…Importantly, Cu 2+ ion co-doping in Ln 3+ -doped nanoparticles to improve UCL offers a wide range of applications in sensors, solar cells, and photocatalysis. Furthermore, Nannuri et al 97 reported that the NaYF 4 :Yb 3+ ,Er 3+ nanoparticles co-doped with Cr 3+ ions at a concentration of 10–15% and post-annealed at 600 °C were found to be most effective in improving the upconversion luminescence with an enhancement factor of 24 for the green region and 33 for the red region. Under the excitation of a 980 nm continuous wave (CW) laser, Yb 3+ /Ho 3+ /Mn 2+ tri-doped CaF 2 microspheres exhibit green-yellow-red tuning colors and outstanding improvement of both red to green ratio (R/G) and red to blue ratio (R/B) when the Mn 2+ concentration was varied from 0 to 30 mol%.…”

Section: Enhancing Upconversion Intensity and Tunable Emission Throug...mentioning

confidence: 99%

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Mohanty

Kaczmarek

2022

Chem. Soc. Rev.

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Section: Enhancing Upconversion Intensity and Tunable Emission Throug...mentioning

confidence: 99%

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Mohanty

Kaczmarek

2022

Chem. Soc. Rev.

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“…However, these materials’ inherent quantum efficiencies are less than 1%. Therefore, of late, much effort has been devoted to improving their quantum efficiency via internal (codoping) and external (postsynthesis conditions such as annealing) approaches. , The drop in upconversion luminescence of β-NaYF 4 :Yb 3+ , Er 3+ particles primarily originates from the surface quenching of the excitation energy via nonradiative recombination. − To alleviate the surface quenching effect, strategies such as shell passivation, dye sensitization, aliovalent doping, strain engineering, etc. are currently being explored. − The most promising and emerging strategy is to have engineered core–shell structures around the upconversion particles.…”

Section: Introductionmentioning

confidence: 99%

Excitation Laser Power and Temperature-Dependent Luminescence of Optically Trapped Upconversion Particles

Karmegam,

Kolikkaje,

Bankapur

et al. 2023

J. Phys. Chem. C

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The routinely adopted ensemble luminescence spectroscopy of rare-earth-ion-doped upconversion micro-/nanoparticles does not provide insights into the role of shell passivation and plasmonic particle incorporation at a single-particle level. Herein, we compare the results of silica shell formation as well as further incorporation of plasmonic nanoparticles onto the green 1 ( 2 H 11/2 to 4 I 15/2 transition, λ�520 nm), green 2 ( 4 S 3/2 to 4 I 15/2 , transition, λ� 540 nm), and red ( 4 F 9/2 to 4 I 15/2 transition) upconversion luminescence of an optically trapped single upconversion particle. Analysis of the results at a single upconversion particle level illustrates that the core−shell particle exhibits a higher intensity for green as well as red emission, and the effect is further pronounced with attachment of plasmonic nanoparticles (NPs) onto the SiO 2 shell. Trapping laser power-dependent studies of an optically trapped particle show a linear increasing behavior for green 1, green 2, and red emissions with a slope value near 1. On the other hand, laser power-dependent studies using the Yb resonant 980 nm laser with a laser power that is 2 orders of magnitude less than the trapping laser show two slope values (changing from less than 1 to more than 1) for the double-logarithmic plot of luminescence of the upconversion microparticle (UCMP) and UCMP@SiO 2 trapped particles, whereas the signal intensity saturates with a single slope value for a UCMP@SiO 2 @Au particle. The temperature-dependent luminescence of the thermally coupled intensity ratio of emission green 1 (520 nm) and green 2 (540 nm) can be applied as a temperature sensor. The thermal sensitivity measurements within the biologically relevant temperature range (298−333 K), using optically trapped particles, reveal distinctions in thermal sensitivity among UCMP, UCMP@SiO 2 , and UCMP@SiO 2 @Au. The results from the present study can find applications in bioimaging, single-cell studies, optical thermometers, photothermal converters, etc.

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“…The challenge is two-fold, first is controlling or eliminating the phase transition of β-LBSO on cooling to room temperature and the second is growing large β-LBSO single crystals. The strategies such as strain adjustment, grain size control, annealing process, and doping are commonly used to manipulate the phase composition or phase transition of functional materials such as VO 2 , TiO 2 , and ZrO 2 . The metal–insulator transition (MIT) temperature of the VO 2 film could be lowered from 68 to 31 °C by adjusting the strain/stress between the film and the substrate .…”

Section: Introductionmentioning

confidence: 99%

Triple-Wavelength Lasing with a Stabilized β-LaBSiO₅:Nd³⁺ Crystal

Huang

Shi

et al. 2022

J. Am. Chem. Soc.

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Multi-wavelength lasers, especially the triple-wavelength laser around 1060 nm, could be produced by the 4F3/2 → 4I11/2 transition of Nd3+ and present numerous challenges and opportunities in the field of optoelectronics. The Nd3+-doped high-temperature phase of LaBSiO5 (β-LBSO) is an ideal crystal to produce triple-wavelength lasers; however, the crystal growth is challenging because of the phase transition from β-LBSO to low-temperature phase (α-LBSO) at 162 °C. This phase transition is successfully suppressed when the doping content of Nd3+ is larger than 6.3 at. %, and the Nd3+-doped β-LBSO is stable at room temperature. The local disorder of BO4 tetrahedra due to Nd3+ doping is essential to the stabilization of β-LBSO. For the first time, the β-LBSO:8%Nd3+ crystal with a dimension of 1.8 × 1.8 × 1.8 cm3 is obtained through the top-seeded solution method. The crystal shows strong optical absorption in the range of 785–815 nm, matching well with the commercial laser diode pumping source. The optical emission of 4F3/2 → 4I11/2 splits into four peaks with the highest optical emission cross section of 2.14 × 10–20 cm2 at 1068 nm. The continuous-wave triple-wavelength generation of coherent light at 1047, 1071, and 1092 nm is achieved with the highest output power of 235 mW and efficiency of 12.1%.

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Post annealing induced manipulation of phase and upconversion luminescence of Cr³⁺ doped NaYF₄:Yb,Er crystals

Abstract: Co-dopant (Cr3+ ion) concentration as well as post annealing found to change the structural as well as luminescence properties of Cr3+ ion doped NaY80%F4:Yb17%,Er3% prepared via a co-precipitation method.

Cited by 20 publications

References 56 publications

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Excitation Laser Power and Temperature-Dependent Luminescence of Optically Trapped Upconversion Particles

Triple-Wavelength Lasing with a Stabilized β-LaBSiO₅:Nd³⁺ Crystal

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Post annealing induced manipulation of phase and upconversion luminescence of Cr3+ doped NaYF4:Yb,Er crystals

Abstract: Co-dopant (Cr3+ ion) concentration as well as post annealing found to change the structural as well as luminescence properties of Cr3+ ion doped NaY80%F4:Yb17%,Er3% prepared via a co-precipitation method.

Cited by 20 publications

References 56 publications

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Unravelling the benefits of transition-metal-co-doping in lanthanide upconversion nanoparticles

Excitation Laser Power and Temperature-Dependent Luminescence of Optically Trapped Upconversion Particles

Triple-Wavelength Lasing with a Stabilized β-LaBSiO5:Nd3+ Crystal

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Product

Resources

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Post annealing induced manipulation of phase and upconversion luminescence of Cr³⁺ doped NaYF₄:Yb,Er crystals

Triple-Wavelength Lasing with a Stabilized β-LaBSiO₅:Nd³⁺ Crystal