Spectroscopic properties and martensitic phase transition of Y4Al2O9:Ce single crystals under high pressure

Wang, Yongjie; Hrubiak, Rostislav; Turczyński, S.; Pawlak, Dorota A.; Malinowski, M.; Włodarczyk, Damian; Kosyl, Katarzyna M.; Paszkowicz, W.; Przybylińska, H.; Wittlin, A.; Kamińska, A.; Zhydachevskyy, Yaroslav; Brik, M.G.; Li, Li; Ma, Chensheng; Suchocki, A.

doi:10.1016/j.actamat.2018.11.057

Cited by 17 publications

(27 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured XRD spectrum, presented in Figure 1, corresponds well with features attributed to Y 4 Al 2 O 9 (YAM) in the database. Locations of the lower-lying 5d bands of Ce 3+ the absorption spectrum of thin YAM: 0.2% Ce 3+ sample had been previously measured and established at 350 nm, 370 nm, and 390 nm [10] in general agreement with a more detailed study [11]. Photoluminescence spectra of the YAM: 0.5% Ce 3+ + 1% Yb 3+ system, confirming the existence of a strong energy transfer mechanism from Ce 3+ to Yb 3+, are presented in Figure 2.…”

Section: Resultssupporting

confidence: 74%

“…The profiles were normalized to unity. The Ce 3+ 5d luminescence decay times in YAM were reported under different excitations and temperatures [10,11,22]. The luminescence decay profiles do not follow single exponential decay; it is also not possible to satisfactorily approximate them with double or triple exponential decay.…”

Section: Resultsmentioning

confidence: 99%

“…The broad width of the Ce 3+ 5d absorption band, along with a significant Stokes shift, introduces a trade-off between these two requirements [6]. From this point of view Yttrium Aluminum Monoclinic (YAM-Y 4 Al 2 O 9 ) is known to fulfill requirements for Ce 3+ host material very well, with favorably located 5d bands' absorption and emission ranges in this host [10,11]. This makes YAM an attractive candidate host material from the point of view of further down-conversion to Yb 3+ ions, but also for down-shifting in the YAM: Ce 3+ system, which may be beneficial for some solar cells.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

et al. 2021

View full text Add to dashboard Cite

In this work, we investigate Ce3+ to Yb3+ energy transfer in Y4Al2O9 (YAM) for potential application in solar spectrum down-converting layers for photovoltaic devices. Photoluminescence properties set, of 10 samples, of the YAM host activated with Ce3+ and Yb3+ with varying concentrations are presented, and the Ce3+ to Yb3+ energy transfer is proven. Measurement of highly non-exponential luminescence decays of Ce3+ 5d band allowed for the calculation of maximal theoretical quantum efficiency, of the expected down-conversion process, equal to 123%. Measurements of Yb3+ emission intensity, in the function of excitation power, confirmed the predominantly single-photon downshifting character of Ce3+ to Yb3+ energy transfer. Favorable location of the Ce3+ 5d bands in YAM makes this system a great candidate for down-converting, and down-shifting, luminescent layers for photovoltaics.

show abstract

Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The same Ce 3+ impurity in YAM was a subject of spectroscopic investigations in Refs. [ 5 , 6 ], whereas triply (Yb 3+ /Ho 3+ /Tm 3+ ) doped YAM nanoparticles were investigated in Ref. [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

First Principles Calculations of Atomic and Electronic Structure of TiAl3+- and TiAl2+-Doped YAlO3

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this paper, the density functional theory accompanied with linear combination of atomic orbitals (LCAO) method is applied to study the atomic and electronic structure of the Ti3+ and Ti2+ ions substituted for the host Al atom in orthorhombic Pbnm bulk YAlO3 crystals. The disordered crystalline structure of YAlO3 was modelled in a large supercell containing 160 atoms, allowing simulation of a substitutional dopant with a concentration of about 3%. In the case of the Ti2+-doped YAlO3, compensated F-center (oxygen vacancy with two trapped electrons) is inserted close to the Ti to make the unit cell neutral. Changes of the interatomic distances and angles between the chemical bonds in the defect-containing lattices were analyzed and quantified. The positions of various defect levels in the host band gap were determined.

show abstract

“…The Raman spectra of pure Y 4 Al 2 O 9 show several modes occurring at 406, 598, 741, and 814 cm –1 along with a broad signal in the range 310–460 cm –1 assigned to Y 4 Al 2 O 9 (Figure d) . Such broad modes are a consequence of the small particle size below 10 nm.…”

Section: Results and Discussionmentioning

confidence: 95%

Rare-Earth-Doped Y₄Al₂O₉ Nanoparticles for Stable Light-Converting Phosphors

Liu

Pokhrel

Tessarek

et al. 2019

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The ternary mixed metal oxides with high specific surface area are industrially important for sensors, catalysis, energy storage, and optoelectronics. However, synthesis of such metal oxides is always challenging, especially when multicomponent mixtures occur due to very narrow formation temperature windows. Flame spray pyrolysis is one of the best known techniques which enable formation of pure phases optimizing the temperature profile via control over the fuel/oxidizer ratio. Here, Y4Al2O9 (monoclinic phase of yttrium aluminum oxide, also known as YAM) and Y4–x Eu x Al2O9 (x = 0.05–1.0) were strategically synthesized with specific precursor–solvent chemistry. While the hydrated yttrium nitrate with 28.2% water was unsuitable for the formation of crystalline Y4Al2O9 particles, the use of organic precursor–solvent combinations (Y/Al 2:1) resulted in 16 nm phase pure, highly crystalline Y4Al2O9 particles. All the materials were characterized by using X-ray diffraction with Rietveld refinement, Raman spectroscopy, and transmission electron microscopy. To develop a stable light-converting phosphor, the Y4Al2O9 host was doped with Eu to investigate the photoluminescence properties of Y4–x Eu x Al2O9 (x = 0.05–1.0). The results indicated increased photoluminescence intensity with increasing Eu3+ concentration up to x = 0.5, i.e., Y3.5Eu0.5Al2O9, and a subsequent drop or decrease in intensity for x ≥ 0.7. Hence, Y3.5Eu0.5Al2O9 is proposed for a potential light-converting phosphor.

show abstract

Spectroscopic properties and martensitic phase transition of Y4Al2O9:Ce single crystals under high pressure

Cited by 17 publications

References 51 publications

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

First Principles Calculations of Atomic and Electronic Structure of TiAl3+- and TiAl2+-Doped YAlO3

Rare-Earth-Doped Y₄Al₂O₉ Nanoparticles for Stable Light-Converting Phosphors

Contact Info

Product

Resources

About

Spectroscopic properties and martensitic phase transition of Y4Al2O9:Ce single crystals under high pressure

Cited by 17 publications

References 51 publications

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

Down-Shifting in the YAM: Ce3+ + Yb3+ System for Solar Cells

First Principles Calculations of Atomic and Electronic Structure of TiAl3+- and TiAl2+-Doped YAlO3

Rare-Earth-Doped Y4Al2O9 Nanoparticles for Stable Light-Converting Phosphors

Contact Info

Product

Resources

About

Rare-Earth-Doped Y₄Al₂O₉ Nanoparticles for Stable Light-Converting Phosphors