Homo–hetero/core–shell structure design strategy of NaYF<sub>4</sub> nanocrystals for superior upconversion luminescence

Janjua, Raheel Ahmed; Iqbal, Obaid; Ahmed, Muhammad Aqeel; Al‐Kahtani, Abdullah A.; Saeed, Sara; Imran, Muhammad; Wattoo, Abdul Ghafar

doi:10.1039/d1ra02157e

Cited by 5 publications

(4 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oleate-based synthesis approach has several advantages, including a narrower particle size distribution, higher luminescence efficiency, and a higher level of phase purity in the final UCNPs. The synthesis of the α-phase is produced at lower temperatures below 300 • C, demonstrating that the process in oleic acid is kinetically regulated despite the thermodynamic preference for the hexagonal bulk phase at low temperatures [137,138].…”

Section: Synthesis Of Nanoscale Nayf 4 Particlesmentioning

confidence: 98%

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Janjua,

Ji,

Shah

et al. 2023

PIER M

View full text Add to dashboard Cite

The optical characteristics and varied applications of lanthanide-doped NaYF4 upconversion nanocrystals have received considerable interest in recent years, such as in ratiometric thermometry. This review thoroughly examines the various synthesis processes utilized in producing these nanocrystals and their application in temperature sensing. Synthesis of NaYF4 upconversion nanocrystals is a complex procedure that requires careful management of dopant concentrations, crystal phase, size, and shape. The distinctive luminescent characteristics of lanthanide ions, which facilitate the transformation of photons with low energy into emissions with higher energy, render NaYF4 nanocrystals suitable for ratiometric thermometry applications. We explore the fundamental concepts underlying upconversion luminescence in developing ratiometric temperature sensors. In this discourse, we examine the selection of lanthanide dopants, the mechanics underlying their energy transmission, and the development of customized sensor architectures. This review covers the recent progress and utilization of NaYF4 upconversion nanocrystals in ratiometric thermometry, including diverse areas such as biological temperature detection, environmental surveillance, and materials research. We evaluate the obstacles and potential advancements in this domain, specifically emphasizing approaches to improving temperature sensors' precision, responsiveness, and applicability based on upconversion.

show abstract

Section: Synthesis Of Nanoscale Nayf 4 Particlesmentioning

confidence: 98%

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Janjua,

Ji,

Shah

et al. 2023

PIER M

View full text Add to dashboard Cite

show abstract

“…Guo et al 39 demonstrated that enhanced emission intensity in GdVO 4 :Yb/Er nanoparticles doped with Lu 3+ , Y 3+ and PO 4 3− ions was realized by 980 & 1550 nm excitation. However, TSTF UCNPs often surfer from low luminescent efficiency [42][43][44] , attributing to the concentration quenching and surface defects [45][46][47][48][49][50] , which partly restrict the further applications in 3-D display. For enhancing UCL efficiency, many approaches, such as doping sensitizer, fabricating core/shell structures, changing the hosts are widely studied [51][52][53][54] .…”

Section: Introductionmentioning

confidence: 99%

“…Many excellent studies on TSTF UCNPs have been reported. [42][43][44] attributed to concentration quenching and surface defects, [45][46][47][48][49][50] which partly restrict further applications in the 3-D display. To enhance UCL efficiency, many approaches, such as doping sensitizers, fabricating core/shell structures, and changing the hosts, have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Enhanced two-step two-frequency upconversion luminescence in a core/shell/shell nanostructure

et al. 2023

View full text Add to dashboard Cite

show abstract

“…For example, even at nanoscale, the hexagonal phase NaYF 4 offers an order of magnitude improved emission as compared to their cubic counterpart [36]. The hexagonal phase of the particles is normally achieved via high reaction temperature or prolonged heat treatment [37,38].…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis and upconversion luminescence of NaYF4:Yb, Gd, Er and NaYF4:Yb, Gd, Tm nanorods

Nannuri¹,

Singh²,

Misra³

et al. 2022

Methods Appl. Fluoresc.

View full text Add to dashboard Cite

Anisotropic rare-earth ion (RE3+) doped fluoride upconversion particles are emerging as a potential candidate in diverse areas, ranging from biomedical imaging to photonics. Here, we develop a facile strategy to synthesize NaYF4:Yb, Er, Gd and NaYF4:Yb, Tm, Gd upconversion nanorods via microwave synthesis route by controlling the synthesis time and compared the optical properties of similar nanorods prepared via solvothermal technique. With the increase in synthesis time, the phase of the particle was found to change from mixed-phase to purely hexagonal and the morphology of the particles change the mixed phase of spherical and rod-shaped particles to completely nanorods for a synthesis time of 60 minutes. Further, the intrinsically hydrophobic particles changed to hydrophilic by removal of oleic capping via acid treatment and the amine-functionalized silica coating. The upconversion luminescence, as well as laser power-dependent emission properties of the surface-modified particles, elucidate that the surface modification route influence the upconversion luminescence as well as solvent-dependent emission properties. Moreover, the laser power-dependent studies elucidate that the upconversion process in a multi-photon process.

show abstract

Homo–hetero/core–shell structure design strategy of NaYF₄ nanocrystals for superior upconversion luminescence

Abstract: Establishment of essential conditions of different phases of NaYF4 and their utilization for the synthesis of core/shell structures to achieve the enhancement of UCL intensities.

Cited by 5 publications

References 57 publications

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Enhanced two-step two-frequency upconversion luminescence in a core/shell/shell nanostructure

Microwave-assisted synthesis and upconversion luminescence of NaYF4:Yb, Gd, Er and NaYF4:Yb, Gd, Tm nanorods

Contact Info

Product

Resources

About

Homo–hetero/core–shell structure design strategy of NaYF4 nanocrystals for superior upconversion luminescence

Abstract: Establishment of essential conditions of different phases of NaYF4 and their utilization for the synthesis of core/shell structures to achieve the enhancement of UCL intensities.

Cited by 5 publications

References 57 publications

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Advances in Synthesis Strategies for Lanthanide-based NaYF4 Upconversion Nanocrystals and Their Applications in Ratiometric Thermometry

Enhanced two-step two-frequency upconversion luminescence in a core/shell/shell nanostructure

Microwave-assisted synthesis and upconversion luminescence of NaYF4:Yb, Gd, Er and NaYF4:Yb, Gd, Tm nanorods

Contact Info

Product

Resources

About

Homo–hetero/core–shell structure design strategy of NaYF₄ nanocrystals for superior upconversion luminescence