Solid-state lighting using laser diodes is an exciting new development that requires new phosphor geometries to handle the greater light fluxes involved. The greater flux from the source results in more conversion and therefore more conversion loss in the phosphor, which generates self-heating, surpassing the stability of current encapsulation strategies used for light-emitting diodes, usually based on silicones. Here, we present a rapid method using spark plasma sintering (SPS) for preparing ceramic phosphor composites of the canonical yellow-emitting phosphor Ce-doped yttrium aluminum garnet (Ce:YAG) combined with a chemically compatible and thermally stable oxide, α-Al2O3. SPS allows for compositional modulation, and phase fraction, microstructure, and luminescent properties of ceramic composites with varying compositions are studied here in detail. The relationship between density, thermal conductivity, and temperature rise during laser-driven phosphor conversion is elucidated, showing that only modes...

/pdf/stable-heat-conducting-phosphor-composites-for-high-power-3vf17aht5d.pdf

Stable, Heat-Conducting Phosphor Composites for High-Power Laser Lighting.

Classic transparent ceramics for laser gain medium and window materials may benefit from their distinctive features of structural homogeneity and high transparency at large scales. However, this has restricted the ability of the ceramics for local light management. Herein, a strategy for ceramic-phosphor design was conducted in the present work via introducing light-scattering centers into single phased YAG: Ce3+ transparent ceramics, and an enhancement of light extraction was experimentally realized through the control of Al2O3 grain size. UV–vis-NIR diffuse reflectance spectra further confirmed the important roles of the excrescent Al2O3 grains. More importantly, PL characterization shows orange-white light emission with high brightness at high temperature. The results highlight that the unique configuration enables simultaneous control of light propagation, luminous efficiency and thermal stability of luminescence, and the design strategy may create great opportunities for laser lighting and displays with high laser power density.

Phase composition, microstructure and luminescent property evolutions in “light-scattering enhanced” Al2O3-Y3Al5O12: Ce3+ ceramic phosphors

A dielectric ceramic composition comprises as a main component, Cu oxide, Si oxide and one selected from the group consisting of Zn oxide alone and a combination of Mg oxide and Zn oxide, as a subcomponent, a glass component including B oxide and at least one selected from the group consisting of Si oxide, Ba oxide, Ca oxide, Sr oxide, Li oxide and Zn oxide, and having a glass softening point is 750° C. or less, wherein a content of said glass component is 1.5 to 15 wt % with respect to 100 wt % of said main component. According to the present invention, a dielectric ceramic composition can be provided which is available to be sintered at low temperature (for example, 950° C. or lower) while comparatively decreasing contents of a glass component, which shows good properties (specific permittivity, loss Q value and insulation resistance), and which is available to perform cofiring different materials.

Dielectric ceramic composition, multilayer complex electronic device, multilayer common mode filter, multilayer ceramic coil and multilayer ceramic capacitor

Colony structure in Ce-doped Al2O3/YAG eutectic systems grown by vertical Bridgman technique

Tunable colorimetric performance of Al2O3-YAG:Ce3+ eutectic crystal by Ce3+ concentration

Vertical Bridgman growth of Al2O3/YAG:Ce melt growth composite

Provided are a ceramic composite for light conversion, which is capable of maintaining a high radiant flux even when the proportion of Gd and Ce is increased to tune the fluorescence peak wavelength to the longer wavelength side, a process for producing the ceramic composite, and a light emitting device including the ceramic composite. The ceramic composite for light conversion is a solidification product including a composition that is represented by a specific formula, and has a texture of continuously and three-dimensionally mutually entangled oxide phases including at least two phases of a first phase and a second phase, characterized in that the first phase is a Y 3 Al 5 O 12 fluorescent phase activated with Ce, and the second phase is an Al 2 O 3 phase, and the first phase and second phase account for 97% by area or more of a cross section of the solidification product, or characterized in that the first phase is a Y 3 Al 5 O 12 fluorescent phase activated with Gd and Ce, and the second phase is an Al 2 O 3 phase, and the first phase and second phase account for 97% by area or more of a cross section of the solidification product.

Ceramic composites for light conversion, process for production thereof, and light-emitting devices provided with same

A dielectric ceramic composition which can be formed into a built-in or multilayer structure through simultaneously firing with a low resistance conductor such as Ag or Cu and can be fired at 800 to 1000°C into a dielectric ceramic exhibiting a dielectric constant (er) of 10 or below, a large Q×f0 value and an absolute value of temperature coefficient (τf) of resonance frequency (f0) of 20 ppm/°C or less whose regulation is easy. The dielectric ceramic composition comprises 5 to 150 pts.wt. of glass component per 100 pts.wt. of main components of the general formula: aZnAl2O4-bZn2SiO4-cTiO2-dZn2TiO4 wherein the molar fractions a, b, c and d of individual components satisfy the relationships: 5.0 ≤ a ≤ 80.0 mol%, 5.0 ≤ b ≤ 70.0 mol%,5.0 ≤ c ≤ 27.5 mol% and 0 ≤ d ≤ 30.0 mol% (provided that a + b + c + d = 100 mol%).

Dielectric ceramic composition, dielectric ceramic and laminated ceramic part including the same

PROBLEM TO BE SOLVED: To provide a dielectric ceramic composition which is fired at 800-1,000°C to be simultaneously fired with Ag, Cu or the like as a low resistance conductor and in which a dielectric ceramic obtained by firing the composition has large Q×f 0 value of ≥9,000 (GHz), ≤30 ppm/°C absolute value of the temperature coefficient τf of resonance frequency f 0 and specific dielectric constant e r of 20-45 which is a freely controllable range. SOLUTION: The dielectric ceramic composition is expressed by general formula, xCaNb 2 O 6 -yZnTiNb 2 O 8 -zTiO 2 . In a triangular chart having CaNb 2 O 6 , ZnTiNb 2 O 8 and TiO 2 as apexes, when the composition is expressed by (x, y, and z), 3-30 pts.wt. glass is blended to 100 pts.wt. main component in a quadrangle range having 4 composition points A (0, 0.46, 0.54), B (0, 0.54, 0.46), C (0.90, 0, 0.10), and D (0.65, 0, 0.35) as apexes. In the composition (x, y, z), x=0 and y=0 are excluded. COPYRIGHT: (C)2005,JPO&NCIPI

Dielectric ceramic composition and laminated ceramic component using the same

Provided is a ceramic complex for light conversion that can lengthen a fluorescent dominant wavelength to 580 nm and can arbitrarily adjust the wavelength within a range of 570 to 580 nm, in which the fluorescent light intensity is not reduced even though the wavelength is lengthened, and that suppresses variation in light emittance. Further provided is a ceramic complex for light conversion with excellent heat resistance and suitable for increased output of a white-light-emitting device. Further provided is a light-emitting device that uses this ceramic complex for light conversion. The present invention is a ceramic complex for light conversion, which is a solidified material made from a composition expressed by formula (1) having an organization where at least two oxide phases, a first phase and a second phase, are continuously, three-dimensionally, and mutually entangled; wherein the first phase is a (Tb, Y)3Al5O12 phase activated by Ce that emits fluorescent light, and the second phase is an Al2O3 phase.

Ceramic complex for light conversion and light-emitting device using same

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