Distribution coefficient of rare-earth dopants in Y3Al5O12 garnet

Tachibana, Makoto; Iwanade, Akio; Miyakawa, Kokoro

doi:10.1016/j.jcrysgro.2021.126191

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The variation of Pr 3+ concentration over the length measured in the as‐grown sample is given in Figure a and follows the normal‐freeze distribution curve for distribution coefficient 0.11. [ 30 ] The calculated Ca concentrations (by taking the distribution coefficient equal to 0.1 [ 31 ] ) are given in the figure legend. Absorption in the second plate subjected to annealing is presented in Figure 2b and shows a gradual increase, when going to the last portions with the highest concentration of both Pr and Ca and converting the color to reddish.…”

Section: Resultsmentioning

confidence: 99%

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Derdzyan

Hovhannesyan

Santos

et al. 2022

Physica Status Solidi (a)

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Single crystals of yttrium aluminum garnet (YAG) with Pr3+ and Ca2+ ions grown by the vertical Bridgman method are submitted to air anneal. The influence of this process on optical absorption, photo‐, and radioluminescence is investigated in a set of samples with different concentrations of Pr and Ca. Absorption induced by the heat treatment in the 300–600 nm range in YAG:Pr,Ca is discussed, in comparison with that in YAG:Ca crystals. Photo‐ and radioluminescence spectra in as‐grown and air‐annealed samples recorded at room temperature are discussed. The features of emission decrease at 5d–4f and 4f–4f transitions of Pr3+ ions after heat treatment are considered.

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Section: Resultsmentioning

confidence: 99%

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Derdzyan

Hovhannesyan

Santos

et al. 2022

Physica Status Solidi (a)

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“…This can be easily melted at 1250 °C, which is considerably lower than the melting point of pure YAG (1940 C). [44] Molten salt synthesis of ZnAl 2 O 4 had has been described by Li et al [45] The formation of ZnAl 2 O 4 started at about 700 °C in LiCl and 800 °C in NaCl and KCl. Preparation of MgAl 2 O 4 by the same method requires a higher temperature of 1100 °C, [46] but it is still considerably lower than the melting point of MgAl 2 O 4 (2135 °C).…”

Section: Application To the Preparation Of Aluminatesmentioning

confidence: 98%

“…This can be easily melted at 1250 °C, which is considerably lower than the melting point of pure YAG (1940 C). [ 44 ]…”

Section: Aluminate Synthesismentioning

confidence: 99%

Luminescent Materials Based on Aluminates: A Review

Revankar

Gedekar²,

Moharil

2022

Physica Status Solidi (a)

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An aluminate is a compound containing an oxyanion of aluminum. Many aluminates are found in nature. A large number of phosphors that are used in various applications, such as scintillation detectors, optical thermometry, longlasting phosphorescence, solid-state lighting, solid-state lasers, upconversion, bioimaging, and plasma display panels, are based on aluminate formulae. This review focuses on the synthesis and characteristics of such phosphors. The conventional as well as novel methods of synthesizing these phosphors are reviewed. The emphasis on commercially important aluminate phosphors is discussed.

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“…In this work, yellow–green phosphors with garnet structure were prepared by co‐ion substitution and integrated into PiG films by co‐sintering at low temperatures. The color rendering quality of warm‐white‐light devices is improved by making up for blue and yellow depressions 21–23 . We used Ba 2+ –Si 4+ cations to replace dodecahedral and tetrahedral sites in the garnet structure.…”

Section: Introductionmentioning

confidence: 99%

“…The color rendering quality of warm-white-light devices is improved by making up for blue and yellow depressions. [21][22][23] We used Ba 2+ -Si 4+ cations to replace dodecahedral and tetrahedral sites in the garnet structure. Furthermore, SiO 2 -BaO-Al 2 O 3 -ZnO-Na 2 O glass powder was chosen to synthesize YAG-based PiG.…”

Section: Introductionmentioning

confidence: 99%

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Zhang

Zhao

et al. 2023

J Am Ceram Soc.

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Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and renders precisely controllable emissions due to the abundant lattice control positions. In this work, we regulate the coordination field of Ce3+ ion based on the co‐substitution method and achieve the spectra regulation in the yellow–green range. We used Ba2+–Si4+ cations to replace Y3+–Al3+ cations in Y3Al5O12 (YAG) matrix to obtain blue‐shift of the emission peak from 552 to 539 nm. The centroid shift and crystal field splitting decrease with the decreasing covalency of the bond between the Ce3+ ion and the surrounding anions owing to the higher electronegativity of Si4+ ions than Al3+ ions. The corresponding fluorescent films were prepared by a low‐temperature co‐sintering process based on the as‐made Ba2+–Si4+ co‐substituted phosphor. X‐ray powder diffractometer and scanning electron microscopy images showed that the fluorescence crystals were less eroded and evenly dispersed in the glass matrix. Spectral analysis showed that the garnet phase was protected by using lead‐free borosilicate glass with a low melting point, and the quantum efficiency of phosphor‐in‐glass (PiG) retains 98% of the corresponding phosphor. By adjusting the ratio of garnet phosphor to commercial red nitride phosphors, a warm white fluorescence with a color rendering index of 80.3 and color temperature of 3899 K was obtained. The prepared warm white film has potential application value in the whole spectra field.

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Distribution coefficient of rare-earth dopants in Y3Al5O12 garnet

Cited by 5 publications

References 26 publications

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Luminescent Materials Based on Aluminates: A Review

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

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Distribution coefficient of rare-earth dopants in Y3Al5O12 garnet

Cited by 5 publications

References 26 publications

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Influence of Air Annealing on Optical and Scintillation Properties of YAG:Pr,Ca

Luminescent Materials Based on Aluminates: A Review

Inorganic remote glass film based on yellowish‐green (Y, Ba)3(Al, Si)5O12:Ce garnet phosphor for warm white LEDs

Contact Info

Product

Resources

About

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs