Photoluminescence Characteristic of Ce3+-Eu3+Co-doped Y3Al5O12Phosphor Prepared by Combustion Method

Kwak, Hyun Ho; Kim, Se Jun; Park, Yong Seo; Yoon, Hyun Hee; Park, Sang Joon; Choi, Hyung-Wook

doi:10.1080/15421400903195908

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…Based on the results presented in this work, the core-shell methodology presents some advantages in comparison with the materials prepared by co-doping such as (a) no competition between Ce and Eu for substituting the Y position in the YAG matrix; and (b) the core and the shell can be optimized independently, achieving the highest PL emission in both cases and avoiding the Ln quenching at high concentrations [3,5].…”

Section: Resultsmentioning

confidence: 99%

“…YAG:Ce is a yellow phosphor with a high quantum efficiency and good thermal and chemical stability [2][3][4]. The strategies to achieve warmer white light have been codoping YAG:Ce with Pr, Cr, Gd and Eu among others [5][6][7][8][9] or to prepare dual-layered YAG-based materials [1,7] to increase the red component in the emission, and to use transparent YAG:Ce ceramics to solve the thermal decomposition of the organic resin and to decrease the scattering [9][10][11]. In the case of the co-doping strategy, the red component in the emission is increased but a decrease in the intensity of the yellow band and in the luminous efficacy occurs as a side effect.…”

Section: Introductionmentioning

confidence: 99%

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Ce3+ and Eu3+ emissions in YAG via a core-shell strategy for warm white LED lighting

Borlaf

Frankowska

Kubiak

et al. 2018

J Sol-Gel Sci Technol

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YAG:Ce and YAG:Eu sols were synthesized by a polymeric sol-gel route. The crystallization temperature of YAG was determined by X-ray diffraction as a function of the calcination temperature, revealing that YAG starts to crystallize directly from the amorphous phase at 800 °C. The effects of the thermal treatment and the dopant amount on the photoluminescent properties were studied, observing the highest emission after calcination at 1000 °C for 1 h in both cases and with a concentration of 1 and 3 mol% of Ce and Eu, respectively. Core-shell materials were prepared by dipping YAG:Ce or YAG: Eu sintered pellets into the synthesized sols and then, these materials were calcined at 1000 °C for 1 h. An effective energy transfer from Ce to Eu was observed in the sample YAG:Eu (core)-YAG:Ce (shell) when blue light (λ = 465 nm) is used as excitation source. This wavelength excites the Ce but not the Eu; however, in the photoluminescence emission spectrum, the bands associated to both ions can be clearly detected, confirming that the core-shell strategy is a good method for the preparation of warmer white LEDs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ce3+ and Eu3+ emissions in YAG via a core-shell strategy for warm white LED lighting

Borlaf

Frankowska

Kubiak

et al. 2018

J Sol-Gel Sci Technol

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“…Yttrium aluminum garnet (Y 3 Al 5 O 12 , YAG) is a ceramic material of high importance as a host of rare earth ions for optical applications . Among the lanthanide ions, cerium (Ce 3+ ) is one of the most interesting for doping YAG producing YAG:Ce phosphors extensively studied for blue to white light conversion .…”

Section: Introductionmentioning

confidence: 99%

Deep submicrometer YAG:Ce phosphor particles with high photoluminescent quantum yield prepared by flame spray synthesis

et al. 2017

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YAG:Ce materials have been extensively studied as phosphors for blue to white light conversion. In the last years, the preparation methods of YAG:Ce powders in the nanometric scale have received intensive attention due to their special optical properties. In this context, the preparation of luminescent particles with high quantum yield (QY) and particle size in the deep submicrometer range is the main focus of this work. Amorphous and hexagonal YAG:Ce nanoparticles (<20 nm) with the stoichiometric composition of YAG:Ce were synthesized by liquid-feed flame spray synthesis. The crystal phase, particle size, and specific surface area (SSA) evolution with the calcination temperature were investigated. A direct conversion from the amorphous/hexagonal phase to the cubic one was observed at T≥900°C, together with an increase in the particle size into the range 100-350 nm and a corresponding decrease in the SSA. Zeta potential of the particles in aqueous dispersions and their photoluminescent properties were characterized. The QY increased for the phosphor powders with lower Ce 3+ concentration. The highest QY of 70%-72% was obtained for powders containing cerium doping of 0.1 mol % and spanning the size range between 130 and 270 nm. K E Y W O R D SCe, flame spray synthesis, photoluminescence, quantum yield, YAG

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“…Thus, WLEDs fabricated with YAG have low color rendering index ( R a ) and high color temperature ( T c ) because of the absence of red components in their spectra [5,6,7]. In order to enhance the emission of YAG in red regions, YAG is optimized by doping with some rare earth ions (such as Eu 3+ , or Pr 3+ ) [6,7,8]. Although optimized YAG exhibit slightly red emission, but the yellow emission of the phosphors is obviously decreased.…”

Section: Introductionmentioning

confidence: 99%

The Photoluminescent Properties of New Cationic Iridium(III) Complexes Using Different Anions and Their Applications in White Light-Emitting Diodes

Yang¹,

Meng²,

Zhou³

et al. 2015

Materials

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Three cationic iridium(III) complexes [Ir(ppy)2(phen)][PF6] (C1), [Ir(ppy)2(phen)]2SiF6 (C2) and [Ir(ppy)2(phen)]2TiF6 (C3) (ppy: 2-phenylpyridine, phen: 1, 10-phenanthroline) using different anions were synthesized and characterized by 1H Nuclear magnetic resonance (1HNMR), mass spectra (MS), Fourier transform infrared (FTIR) spectra and element analysis (EA). After the ultraviolet visible (UV-vis) absorption spectra, photoluminescent (PL) properties and thermal properties of the complexes were investigated, complex C1 and C3 with good optical properties and high thermal stability were used in white light-emitting diodes (WLEDs) as luminescence conversion materials by incorporation with 460 nm-emitting blue GaN chips. The integrative performances of the WLEDs fabricated with complex C1 and C3 are better than those fabricated with the widely used yellow phosphor Y3Al5O12:Ce3+ (YAG). The color rendering indexes of the WLEDs with C1 and C3 are 82.0 and 82.6, the color temperatures of them are 5912 K and 3717 K, and the maximum power efficiencies of them are 10.61 Lm·W−1 and 11.41 Lm·W−1, respectively.

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Photoluminescence Characteristic of Ce³⁺-Eu³⁺Co-doped Y₃Al₅O₁₂Phosphor Prepared by Combustion Method

Cited by 11 publications

References 10 publications

Ce3+ and Eu3+ emissions in YAG via a core-shell strategy for warm white LED lighting

Ce3+ and Eu3+ emissions in YAG via a core-shell strategy for warm white LED lighting

Deep submicrometer YAG:Ce phosphor particles with high photoluminescent quantum yield prepared by flame spray synthesis

The Photoluminescent Properties of New Cationic Iridium(III) Complexes Using Different Anions and Their Applications in White Light-Emitting Diodes

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