Transmitting, emitting and controlling light: Processing of transparent ceramics using current-activated pressure-assisted densification

Kodera, Yasuhiro; Hardin, Corey; Garay, Javier E.

doi:10.1016/j.scriptamat.2013.02.013

Cited by 58 publications

(35 citation statements)

References 36 publications

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“…It should be noted that the transparency of a polycrystalline ceramic scintillator material is influenced by both scattering and absorption [14,15]. Optical scattering in ceramic scintillators is mainly caused by the birefringence (in non-cubic systems) or by second phases scattering (including entrapped gas pores in grains and microstructural components with different refractive index at grain boundaries).…”

Section: Resultsmentioning

confidence: 99%

Microstructure and optical characteristics of Ce:Gd3(Ga,Al)5O12 ceramic for scintillator application

Luo

Jiang

et al. 2015

Ceramics International

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Section: Resultsmentioning

confidence: 99%

Microstructure and optical characteristics of Ce:Gd3(Ga,Al)5O12 ceramic for scintillator application

Luo

Jiang

et al. 2015

Ceramics International

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“…17,19 CAPAD processing yielded translucent Ce:AlN with greater than 99% relative density in all samples. Figure 1 shows SE and BSE SEM micrographs for samples 2, 3, and 4.…”

confidence: 91%

“…[13][14][15] Of particular importance are the high heating and cooling rates that allow for higher than equilibrium doping in ceramics. 16,17 The inset in the top left corner of Figure 1 is a picture of a CAPAD processed Ce:AlN ceramic on top of a commercial UV-LED (365 nm, LED World). The light emitted is white, demonstrating a proof of the concept that Ce:AlN is viable for SSL applications.…”

confidence: 99%

Broadband white light emission from Ce:AlN ceramics: High thermal conductivity down-converters for LED and laser-driven solid state lighting

et al. 2016

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We introduce high thermal conductivity aluminum nitride (AlN) as a transparent ceramic host for Ce3+, a well-known active ion dopant. We show that the Ce:AlN ceramics have overlapping photoluminescent (PL) emission peaks that cover almost the entire visible range resulting in a white appearance under 375 nm excitation without the need for color mixing. The PL is due to a combination of intrinsic AlN defect complexes and Ce3+ electronic transitions. Importantly, the peak intensities can be tuned by varying the Ce concentration and processing parameters, causing different shades of white light without the need for multiple phosphors or light sources. The Commission Internationale de l’Eclairage coordinates calculated from the measured spectra confirm white light emission. In addition, we demonstrate the viability of laser driven white light emission by coupling the Ce:AlN to a readily available frequency tripled Nd-YAG laser emitting at 355 nm. The high thermal conductivity of these ceramic down-converters holds significant promise for producing higher power white light sources than those available today.

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“…Transparent ceramics synthesized by FAST/SPS include a large number of optically isotropic materials [132] like yttrium-aluminum-garnet (YAG), pure or doped with rare earths, [133][134][135][136] yttria, [137] magnesia, [138] magnesium aluminum spinel, [139,140] fully stabilized zirconia, [141] and lutetium based oxides. [142] Optically anisotropic ceramics are even more challenging, as the transparency decreases drastically as grain size increases, and alumina, [143][144][145][146] tetragonal zirconia, [147] or hydroxyapatite [148] have been synthesized with improving success.…”

Section: Transparent Ceramicsmentioning

confidence: 99%

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

et al. 2014

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Field-assisted sintering technology/Spark plasma sintering is a low voltage, direct current (DC) pulsed current activated, pressure-assisted sintering, and synthesis technique, which has been widely applied for materials processing in the recent years. After a description of its working principles and historical background, mechanical, thermal, electrical effects in FAST/SPS are presented along with the role of atmosphere. A selection of successful materials development including refractory materials, nanocrystalline functional ceramics, graded, and non-equilibrium materials is then discussed. Finally, technological aspects (advanced tool concepts, temperature measurement, finite element simulations) are covered.

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Transmitting, emitting and controlling light: Processing of transparent ceramics using current-activated pressure-assisted densification

Cited by 58 publications

References 36 publications

Microstructure and optical characteristics of Ce:Gd3(Ga,Al)5O12 ceramic for scintillator application

Microstructure and optical characteristics of Ce:Gd3(Ga,Al)5O12 ceramic for scintillator application

Broadband white light emission from Ce:AlN ceramics: High thermal conductivity down-converters for LED and laser-driven solid state lighting

Field‐Assisted Sintering Technology/Spark Plasma Sintering: Mechanisms, Materials, and Technology Developments

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