Synthesis of Y3Al5O12:Eu and Y3Al5O12:Eu,Si phosphors by combustion method: Comparative investigations on the structural and spectral properties

Upasani, Manisha

doi:10.1007/s40145-016-0208-y

Cited by 52 publications

(18 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Now, it has been justified that the doping of Li + ions increases the crystallite size of the Ho 3+ −Yb 3+ -doped ZnGa 2 O 4 phosphor, which is a signature of high crystallinity in the phosphor samples. 5,42 The dislocation density is an important parameter for the good quality of a phosphor material. We have also calculated the dislocation density (δ) for Ho 3+ −Yb 3+ and Ho 3+ −Yb 3+ −Li + co-doped ZnGa 2 O 4 phosphors by using the following formula 42…”

Section: Resultsmentioning

confidence: 99%

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

et al. 2020

View full text Add to dashboard Cite

We report on highly pure green upconversion (UC) photoluminescence in a Ho 3+ /Yb 3+ /Li + co-doped ZnGa 2 O 4 phosphor prepared by the solid-state reaction method for the first time. The crystallite size, dislocation density, and microstrain values show the crystalline nature of the phosphors. The scanning electron micrographs show shapes and sizes of the phosphor, and they change in the presence of Li + ions. The energy-dispersive X-ray spectroscopic analysis reveals the presence of Ga, Zn, Ho, Yb, and O elements in the phosphor. Fourier transform infrared studies show vibrational bands because of Zn−O and Ga−O groups. The diffuse reflectance spectra contain large number of absorption bands of Ho 3+ and Yb 3+ ions. The optical band gap of the phosphor sample slightly decreases through Li + doping. The Ho 3+ /Yb 3+ co-doped phosphor shows intense green along with weak blue, red, and near-infrared UC emissions excited at 980 nm. The intensity of green UC emission at 537 nm is a dominant one. The emission intensity of the Ho 3+ -doped phosphor is enhanced upto 372 times via Yb 3+ doping, which further enhanced upto 966 times via Li + doping. It is because of the increase in the local crystal structure and particle size. The spectral color purity (S gr ) is achieved as 0.98 in the phosphor. The lifetimes of the 5 F 4 state of Ho 3+ ions are increased in the presence of Li + ions. Interestingly, the variation of pump power gives rise to intrinsic optical bistability sensing in the Ho 3+ /Yb 3+ /Li + co-doped ZnGa 2 O 4 phosphor, and it gives efficient sensing for the green emission. Thus, the Ho 3+ /Yb 3+ /Li + co-doped ZnGa 2 O 4 phosphor may be used in green-emitting sources, UC-based devices, optical memory devices, and optically bistable devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

et al. 2020

View full text Add to dashboard Cite

show abstract

“…YAG-based ceramics can accept a variety of active doping agents such as Ce 3+ and Nd 3+ for fluorescence LED or solid laser host material applications 1,4,5,37 . Luminescence properties were measured on a Ce 3+ -doped YAG-Al 2 O 3 composite ceramic (AY26 glass crystallized for 2 h at 1100 °C).…”

Section: Resultsmentioning

confidence: 99%

“…Transparent crystalline yttrium aluminum garnet (YAG; Y 3 Al 5 O 12 ) is particularly noteworthy due to its importance as a host material in solid state lasers 1–4 , phosphors 5–8 , and scintillators 9 . Commercial YAG materials are usually single crystals, which are grown by directional solidification from melts and demonstrate outstanding optical performances 10 .…”

Section: Introductionmentioning

confidence: 99%

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

et al. 2018

Nat Commun

148

115

View full text Add to dashboard Cite

Transparent crystalline yttrium aluminum garnet (YAG; Y3Al5O12) is a dominant host material used in phosphors, scintillators, and solid state lasers. However, YAG single crystals and transparent ceramics face several technological limitations including complex, time-consuming, and costly synthetic approaches. Here we report facile elaboration of transparent YAG-based ceramics by pressureless nano-crystallization of Y2O3–Al2O3 bulk glasses. The resulting ceramics present a nanostructuration composed of YAG nanocrystals (77 wt%) separated by small Al2O3 crystalline domains (23 wt%). The hardness of these YAG-Al2O3 nanoceramics is 10% higher than that of YAG single crystals. When doped by Ce3+, the YAG-Al2O3 ceramics show a 87.5% quantum efficiency. The combination of these mechanical and optical properties, coupled with their simple, economical, and innovative preparation method, could drive the development of technologically relevant materials with potential applications in wide optical fields such as scintillators, lenses, gem stones, and phosphor converters in high-power white-light LED and laser diode.

show abstract

“…It is well known that the ratio of emission intensity of the 5 D 0 / 7 F 2 to the 5 D 0 / 7 F 1 transitions can be used as a probe of symmetry of Eu 3+ site (asymmetric ratio, R) and if the value increases, the inversion symmetry of europium site decreases. [18][19][20][21] Value of R calculated using emission intensities is equal to 5 and 3 for the spectra excited at 393 and 395, respectively. Due to the fact that the symmetry of calcium sites is described as C 1 (less symmetrical) and yttrium sitesas C 3 , it can be concluded that the radiation equal to 395 nm excites mainly Eu 3+ incorporated into the yttrium sites (Eu Â Y ), while the radiation of 393 nm excites mainly Eu 3+ in Ca 2+ sites ðEu Ca Þ: However, it is difficult to distinguish the emissions from individual calcium sites since they all have C 1 symmetry.…”

Section: Resultsmentioning

confidence: 99%

Influence of Al³⁺co-doping on the spectral properties of europium doped Ca₉Y(PO₄)₇

2020

View full text Add to dashboard Cite

show abstract

Synthesis of Y3Al5O12:Eu and Y3Al5O12:Eu,Si phosphors by combustion method: Comparative investigations on the structural and spectral properties

Cited by 52 publications

References 38 publications

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

Influence of Al³⁺co-doping on the spectral properties of europium doped Ca₉Y(PO₄)₇

Contact Info

Product

Resources

About

Synthesis of Y3Al5O12:Eu and Y3Al5O12:Eu,Si phosphors by combustion method: Comparative investigations on the structural and spectral properties

Cited by 52 publications

References 38 publications

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho3+/Yb3+ Co-Doped ZnGa2O4 Phosphor through Li+ Doping

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho3+/Yb3+ Co-Doped ZnGa2O4 Phosphor through Li+ Doping

Pressureless glass crystallization of transparent yttrium aluminum garnet-based nanoceramics

Influence of Al3+co-doping on the spectral properties of europium doped Ca9Y(PO4)7

Contact Info

Product

Resources

About

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

Near-Infrared Light Excited Highly Pure Green Upconversion Photoluminescence and Intrinsic Optical Bistability Sensing in a Ho³⁺/Yb³⁺ Co-Doped ZnGa₂O₄ Phosphor through Li⁺ Doping

Influence of Al³⁺co-doping on the spectral properties of europium doped Ca₉Y(PO₄)₇