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Ceramic composition

一种陶瓷组合物、组合物的技术，应用在稀土金属化合物、稀土金属氧化物/氢氧化物、可持续建筑等方向，能够解决白色LED颜色不均、透过率下降、耐热性差等问题，达到提高内量子效率、抑制发光效率的下降的效果

Active Publication Date: 2019-07-19
KONOSHIMA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, such white light-emitting diodes must use translucent resins such as epoxy resins and silicone resins to form mold members, and it is difficult to ensure the uniformity of the mixed state of phosphor powder and resin and to control the stability of the thickness of the coating film. etc., it is easy to produce color unevenness and deviation (バラツキ) of white LED
[0005] In addition, in order to enclose or coat phosphor powder, or to allow part of the blue light of the light source to pass through the coating film without light conversion, a light-transmitting resin is required. Since the heat resistance of the light-transmitting resin is poor, Therefore, it is easy to cause a drop in transmittance due to modification by heat from the light emitting element
Therefore, it has become a bottleneck for increasing the output of white LEDs

Method used

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Examples

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preparation example Construction

[0110] The preparation method of the ceramic composition of the present invention is not particularly limited, but it can be obtained, for example, by firing a composition (precursor composition, ceramic precursor composition) containing a fluorescent material and lanthanum oxide (sintering treatment). .

[0111] As the fluorescent material, commercially available items may be used, or prepared products may be used. The method for producing the fluorescent material can be appropriately selected according to the type of fluorescent material, and is not particularly limited, and a commonly used method can be used.

[0112] For example, it can be obtained by heat-treating (firing, calcining) a fluorescent material source [for example, yttrium salt, aluminum salt, and if necessary, a rare earth element salt (cerium salt, etc.)] in the presence of oxygen.

[0113] In addition, the heat treatment temperature may be, for example, 500°C or higher (for example, 600 to 2000°C), prefera...

Embodiment 1

[0152] Embodiment 1: Ce:YAG+scattering source LAP

[0153] [Fluorescence material (Ce 0.15%:YAG)]

[0154] 14.98 L of 0.5 mol / L high-purity (rare earth elements are more than 99.99%, hereinafter the same) yttrium chloride aqueous solution, 0.02 L of 0.5 mol / L high-purity cerium nitrate aqueous solution, 25 L of 0.5 mol / L high Pure aluminum chloride aqueous solution is mixed to make a mixed solution composed of garnet (YAG).

[0155] A mixed solution composed of YAG was added dropwise at a rate of 1.5 L / min to 40 L of a 2 mol / L ammonium bicarbonate aqueous solution whose pH was adjusted to 8.2 using ammonia water. At this time, the mixed solution composed of YAG and the ammonium bicarbonate aqueous solution were simultaneously maintained at 32°C.

[0156]After the dropwise addition, aging at 32° C. for 48 hours, filtration and water washing were repeated 6 times to obtain a YAG precursor. The obtained YAG precursor was calcined at 1200° C. for 5 hours in the air and pulveri...

Embodiment 2

[0171] Embodiment 2: Ce: (Y, Gd) AG+scattering source LAP

[0172] Except for using the fluorescent material (Ce:(Y,Gd)AG) obtained by the following method as the fluorescent material in Example 1, molding and firing were carried out in the same manner as in Example 1 to obtain a sintered body (ceramic) .

[0173] As in Example 1, the obtained sintered body had a structure in which individual particles (single crystal particles) in micron units were closely aggregated (the width of the grain boundary was less than 1 nm), almost no voids were confirmed, and there were no impurities in the grain boundaries. In addition, it was confirmed that some crystal grains were grains with different contrasts, and were composed of two different substances.

[0174] Furthermore, the obtained sintered body was arranged on the blue LED, and the luminance in the vertical direction and at an angle of 45 degrees was compared using a luminance meter, and the luminance was about the same. From ...

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Abstract

Provided is a ceramic composition which can impart a light scattering function while keeping the optical properties thereof at high levels. The ceramic composition is composed of a fluorescent phase formed of a fluorescent material and a light-scattering phase formed from a lanthanum oxide. The lanthanum oxide may comprise, for example, at least one compound selected from LaAlO3 and La2O3. The ratio of the fluorescent material (or the fluorescent phase) to the lanthanum oxide (or the light-scattering phase), i.e., the (former) / (latter) ratio (by volume), may be 99.9 / 0.1 to 50 / 50.

Description

technical field [0001] The present invention relates to a ceramic composition (ceramic material) comprising a light-scattering agent composed of lanthanum oxide and lanthanum oxide as a light-scattering phase. Background technique [0002] White LEDs (Light Emitting Diodes) are manufactured by combining blue LEDs with yellow phosphors. [0003] For example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2000-208815) discloses a light-emitting diode capable of emitting white light, which is characterized in that the light-emitting diode has: A light-emitting element capable of emitting blue light with a light-emitting layer composed of a compound semiconductor; a coating part provided on the light-emitting element; and a mold member (mold member) for protecting the coating part. A yellow photoluminescent phosphor that fluoresces by converting at least a part of the blue light emitted by the light emitting element into a wavelength, and the mold mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/08C04B35/50C09K11/80G02B5/20H01L33/50H01L33/58
CPCC04B35/50H01L33/50H01L33/58G02B5/20C09K11/7774Y02B20/00C01F17/206C01F17/34C01P2006/60C09K11/025H01L33/502
Inventor 柳谷高公村松克洋远藤笃子盐田一成
Owner KONOSHIMA CHEMICAL CO LTD
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