Luminescence studies on lanthanide ions (Gd3+, Tb3+) doped YAG:Ce phosphors by combustion synthesis

Upasani, Manisha; Butey, Bhavana

doi:10.9790/4861-06232833

Cited by 11 publications

(11 citation statements)

References 22 publications

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“…As seen, projections of the areas of empty cells and phosphor microparticles for the layer P 1 As it follows from the equations (24) and (25),…”

Section: S S S S S Smentioning

confidence: 88%

“…Let us add the layer P 2 to the layer P 1 and find the probability of overlapping between projections of areas inherent to empty cells and those of phosphor microparticles in these layers, in other words, the probabilities of overlapping between areas S E (2) and S E (1) , S E (2) and S P (1) , S P (2) and S P (1) , S P (2) and S P (1) (superscript indicates the layer number). Since microparticles and empty cells in P 1 and P 2 layers are placed in a chaotic way, the probabilities of overlapping between these areas are equal to the product of the respective probabilities, namely: [21].…”

Section: Development Of the Modelmentioning

confidence: 99%

“…Therefore, both the theory of these substances and their practical application are based exclusively on investigations of luminescent emission [1][2][3][4][5][6][7], diffuse reflection [8][9][10][11][12] and transmission spectra [13], excitation spectra [14][15][16][17][18] as well as on the absorption ones [19]. Since these investigations cannot provide separated registration of the parts of the scattered and absorbed light, it is not possible to calculate the main optical characteristic of powder materials -their absorption coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Khmil¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Developed in the work has been the mathematical model of the composite film, which enables to calculate the wavelength dependence of the absorption coefficient of microcrystals in the phosphor composition. Also, developed has been a new method for determining the spectrum of the absorption coefficient for microparticles of powderlike materials. Being based on this method, obtained has been the wavelength dependence for the absorption coefficient of microparticles of inorganic phosphor ФЛЖ-7-01. At the emission peak of a blue LED (456 nm) their absorption coefficient is close to 684 cm -1 .

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“…As seen, projections of the areas of empty cells and phosphor microparticles for the layer P 1 As it follows from the equations (24) and (25),…”

Section: S S S S S Smentioning

confidence: 88%

Section: Development Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Khmil¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The XRD pattern of YAG:Ce and YAG:Ce, Re reveals a cubic garnet structure, polycrystalline, with the main peak centred at 2q = 33.41°a nd it may be attributed to (420) Miller indices. [6,18,20,25,63].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

“…Ionic radii for Y 3+ (VIII coordina− tion) 1.019 A°, Al 3+ (IV coordination) 0.39A°and (VI coor− dination) 0.535 A°, dopants: Ce 3+ (VIII coordination) 1.143 A°, Pr 3+ (VIII coordination) 1.126 A°, Eu 3+ (VIII coordina− tion) 1.066 A°, Gd 3+ (VIII coordination) 1.053A°, Tb 3+ (VIII coordination) 1.04A°, Ga 3+ (IV coordination) 0.47A°a nd (VI coordination) 0.62 A°, etc. [25,[66][67][68][69].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Synthesis and characterization of YAG:Ce phosphors for white LEDs

Ţucureanu

Matei

Avram

2015

Opto-Electronics Review

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Worldwide commercial interest in the production of cerium doped yttrium aluminium garnet (YAG:Ce) phosphors is reflected in the widespread use of white light emitting devices. Despite of the fact that YAG:Ce is considered a “cool phosphor” it is the most important in white LED technology. This article reviews the developed techniques for producing phosphors with superior photoluminescence efficiency, including solid-state reaction, sol-gel and (co)precipitation methods. Also, by co-doping with rare earth elements, a red/blue shift is reached in the spectrum. The characteristics of YAG:Ce phosphors are investigated because the properties of the phosphors are strongly influenced by the synthesis routes and the sintering temperature treatment. After the phase analysis, morphology and emission studies of the phosphors there may be seen the conditions when the transition from the amorphous phase to the crystalline phase appears, when luminescent properties are influenced by the crystalline form, purity, average size of the particles, co-doping and so on.

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Effect of Ga³⁺ and Gd³⁺ ions substitution on the structural and optical properties of Ce³⁺‐doped yttrium aluminium garnet phosphor nanopowders

2016

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The structural and optical properties of commercially obtained Y Al O :Ce phosphor were investigated by replacing Al with Ga and Y with Gd in the Y Al O :Ce structure to form Y (Al,Ga) O :Ce and (Y,Gd) Al O :Ce . X-Ray diffraction (XRD) results showed slight 2-theta peak shifts to lower angles when Ga was used and to higher angles when Gd was used, with respect to peaks from Y Al O :Ce and JCPDS card no. 73-1370. This could be attributed to induced crystal-field effects due to the different ionic sizes of Ga and Gd compared with Al and Y . The photoluminescence (PL) spectra showed broad excitation from 350 to 550 nm with a maximum at 472 nm, and broad emission bands from 500 to 650 nm, centred at 578 nm for Y Al O :Ce arising from the 5d → 4f transition of Ce . PL revealed a blue shift for Ga substitution and a red shift for Gd substitution. UV-Vis showed two absorption peaks at 357 and 457 nm for Y Al O :Ce , with peaks shifting to 432 nm for Ga and 460 nm for Gd substitutions. Changes in the trap levels or in the depth and number of traps due to Ce were analysed using thermoluminescence (TL) spectroscopy. This revealed the existence of shallow and deep traps. It was observed that Ga substitution contributes to the shallowest traps at 74 °C and fewer deep traps at 163 °C, followed by Gd with shallow traps at 87 °C and deep traps at 146 °C. Copyright © 2016 John Wiley & Sons, Ltd.

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Luminescence studies on lanthanide ions (Gd3+, Tb3+) doped YAG:Ce phosphors by combustion synthesis

Cited by 11 publications

References 22 publications

Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Synthesis and characterization of YAG:Ce phosphors for white LEDs

Effect of Ga³⁺ and Gd³⁺ ions substitution on the structural and optical properties of Ce³⁺‐doped yttrium aluminium garnet phosphor nanopowders

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Luminescence studies on lanthanide ions (Gd3+, Tb3+) doped YAG:Ce phosphors by combustion synthesis

Cited by 11 publications

References 22 publications

Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Determination of the spectral dependence for the absorption coefficient of phosphor inorganic microparticles

Synthesis and characterization of YAG:Ce phosphors for white LEDs

Effect of Ga3+ and Gd3+ ions substitution on the structural and optical properties of Ce3+‐doped yttrium aluminium garnet phosphor nanopowders

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Effect of Ga³⁺ and Gd³⁺ ions substitution on the structural and optical properties of Ce³⁺‐doped yttrium aluminium garnet phosphor nanopowders