Microstructure and upconversion luminescence of Yb3+ and Ho3+ co-doped BST thick films

Zhang, Tianjin; Lin, Yi-Hsiu; Wang, Jingyang; Wu, Ji-qing

doi:10.1007/s10853-010-4781-0

Cited by 9 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The properties of the host lattice and its interaction with the dopant ions therefore have a strong influence on the UC process [9]. It has been shown that UC emission efficiency depends strongly on host phonon energy, where in low-phonon-energy hosts, multi-phonon relaxation processes are depressed and efficiency-enhanced [10]. Because of their excellent chemical stability, broad transparency range, and good thermal conductivity, rare-earth sesquioxides are well-suited host materials [11].…”

Section: Introductionmentioning

confidence: 99%

Color-tunable up-conversion emission in Y2O3:Yb3+, Er3+ nanoparticles prepared by polymer complex solution method

2013

View full text Add to dashboard Cite

Powders of Y2O3 co-doped with Yb3+ and Er3+ composed of well-crystallized nanoparticles (30 to 50 nm in diameter) with no adsorbed ligand species on their surface are prepared by polymer complex solution method. These powders exhibit up-conversion emission upon 978-nm excitation with a color that can be tuned from green to red by changing the Yb3+/Er3+ concentration ratio. The mechanism underlying up-conversion color changes is presented along with material structural and optical properties.PACS42.70.-a, 78.55.Hx, 78.60.-b

show abstract

Section: Introductionmentioning

confidence: 99%

Color-tunable up-conversion emission in Y2O3:Yb3+, Er3+ nanoparticles prepared by polymer complex solution method

2013

View full text Add to dashboard Cite

show abstract

“…The above emission process is a typical ET (energy transfer) process from Yb 3+ to Ho 3+ . Which existed other energy transfer processes to produce the above emissions, such as GAT (energy transfer through absorption energy by ground state) [44] or EAT (excitation state absorption) [45], but ET process was mainly responsible for the energy transfer in Ho 3+ -Yb 3+ co-doped phosphors because Yb 3+ has much larger absorption section than Ho 3+ for 980 nm exciting light. It is well agreement with the fact that the UC emission intensity is relatively weak for Ho 3+ single-doped BTO phosphors [9].…”

Section: Resultsmentioning

confidence: 99%

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

et al. 2021

View full text Add to dashboard Cite

A series of novel Li+ doped Bi3.46Ho0.04Yb0.5Ti3O12 (BHYTO: xLi, 0 ≤ x ≤ 0.15) upconversion phosphors were prepared through a sol-gel-sintering method. There exist three emission bands centered at 545 nm, 658 nm, and 756 nm in the upconversion emission spectra at 980 nm excitation, corresponding to energy transitions of 5F4/5S2 → 5I8, 5F5 → 5I8 and 5F4/5S2 → 5I7 of Ho3+, and the upconversion emission intensity of BHYTO: 0.05Li is about 2.2 times stronger than that of BHYTO samples. The luminescent lifetime of the strongest emission (545 nm) is in the range of 45.25 to 65.99 μs for the different BHYTO: xLi phosphors. The energy transfers during the upconversion pumping process from Yb3+ to Ho3+ are mainly responsible for all the emissions, each belonging to a double-photon process. Li+ mainly entered into the interspace sites or occupied Bi3+ sites in Bi4Ti3O12 host during the fabrication process according to its dosage, and the possibility is very low for Li+ to take part in the energy transfer process directly due to its lack of matching levels with 4f of Ho3+ and Yb3+. However, Li+ doping can not only increase the size of crystal grains to improve crystallinity through XRD analysis, but also reduced oxygen vacancies to decrease the number of quenching centers through XPS analysis. The improved crystallinity and reduced quenching centers are proposed to be the main causes for the enhanced upconversion luminescence of the Li+ doped BHYTO phosphor.

show abstract

“…Moreover, of particular impor-tance is the controlled synthesis of the host lattice having targeting crystal structure which determines the distance between the dop-ant ions, their relative spatial position, their coordination numbers, and the type of anions surrounding the dopant. In addition, the low symmetry and low phonon energies of the host lattice are essential for reducing the multiphonon relaxation and increasing the life-time of the intermediate states involved in upconversion [10]. Most of research are concerned with halide host matrix processing and particularly with the hexagonal sodium yttrium fluoride which has been regarded as one of the most efficient up conversion host matrix having the phonon energies below 500 cm À1 [11][12][13].Of the medium phonon energies host matrices, cubic yttria posses high chemical and thermal stability and is one of the most efficient nonhalide host material [11].…”

Section: Introductionmentioning

confidence: 99%

Aerosol route as a feasible bottom-up chemical approach for up-converting phosphor particles processing

Dugandžić

Lojpur

Mančić

et al. 2013

Advanced Powder Technology

View full text Add to dashboard Cite

Abstract:The opportunities of the hot wall aerosol synthesis, i.e. conventional spray pyrolysis (CSP) method are demonstrated for the generation of highly spherical threedimensional (3D) nanostructured phosphor particles with uniformly distributed components, phases and nano-clustered inner structure. With the presumption that certain particle morphology is formed during the evaporation/drying stage, the aerosol transport properties and powder generation are correlated with the particles structural and morpholog-ical features. With the help of various analyzing techniques like Field Emission Scanning Electron Micros-copy (FE-SEM), Transmission Electron Microscopy (TEM) coupled with energy dispersive X-ray Analysis and STEM mode (TEM/EDS), X-ray Powder Diffraction (XRPD) and fluorescence measurements the feasi-ble processing of up-conversion rare-earth Y 2 O 3 :Er, Yb phosphors powders are discussed.

show abstract

Microstructure and upconversion luminescence of Yb3+ and Ho3+ co-doped BST thick films

Cited by 9 publications

References 21 publications

Color-tunable up-conversion emission in Y2O3:Yb3+, Er3+ nanoparticles prepared by polymer complex solution method

Color-tunable up-conversion emission in Y2O3:Yb3+, Er3+ nanoparticles prepared by polymer complex solution method

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

Aerosol route as a feasible bottom-up chemical approach for up-converting phosphor particles processing

Contact Info

Product

Resources

About