In Japan, Ceratec, which is engaged in the business of high-performance ceramic products, has developed a fluorescent plate "PhosCera" (registered trademark registration) for LED lamps consisting only of high-performance ceramic components, and has recently started sampling. Ceratec expects to achieve low prices through mass production and the like.
The fluorescent plates developed this time are mainly used for LED lamps using the "remote phosphor" method. The remote phosphor refers to a method in which a fluorescent plate is disposed separately from a substrate in which a plurality of blue LED elements (used as a heat source and a light source) are packaged. The green-yellow-red phosphors (average particle size 10μ~20μm) in the fluorescent plate coating are excited by the blue LED light source to emit light of various colors. When these lights are mixed, an illumination such as white is formed. The fluorescent plates developed this time are mainly used for large-scale LED lighting fixtures such as large commercial facilities and factories.
On the surface of the green, yellow and red phosphor particles, a layer of fine special ceramic particles (having a particle size of several nm) is first coated as a bonding layer, and then such particles and ceramic particles forming the coating mother phase (average particle diameter) Mixing 10 μ ~ 20 μm), dispersing it in a solvent to make "ink", and then applying the "ink" to the surface of the heat-resistant glass (inside) as a substrate of the fluorescent sheet by screen printing, and then drying, It is fired to form a coating of a fluorescent sheet. It is estimated that the coating can be adhered to the surface of the glass by the bonding function of the ceramic particles. On the prototype, the thickness of the coating of the green-yellow-red phosphors uniformly dispersed in the ceramic matrix was about 80 μm.
According to Ceratec, ceramic particles are binders for forming coatings, the main component of which is SiO2 ceramics, "phosphor powders are made of YAG (a garnet structure crystal composed of a composite oxide of yttrium and aluminum Y3Al5O12) phosphors and sulfides. Phosphor composition." Generally, moisture in the air easily causes deterioration of the phosphor, but after the phosphor is mixed in the matrix phase of the ceramic particles, moisture can be blocked and durability can be improved.
Makita, a remote phosphor-based LED luminaire supplied by other companies, is estimated to use a resin glue called an organic binder to fix the phosphors. According to Ceratec, "Compared with organic binders, the heat resistance, light resistance and luminous efficiency of the lamps will increase with the mother phase formed by ceramic particles," especially the luminous efficiency will be greatly improved.
Regarding the heat resistance, in the long-term heat resistance test using the prototype, in the exposure test of 2000 hours, at the temperature of 200 ° C, the peeling of the coating from the substrate glass occurred in the test. The sample "heat resistance is above 500 ° C".
Ceratec said that the fluorescent plate developed this time has excellent light resistance, so it can be used for applications such as ultraviolet LEDs and lasers that require excellent light resistance.
The fluorescent plates developed this time are mainly used for LED lamps using the "remote phosphor" method. The remote phosphor refers to a method in which a fluorescent plate is disposed separately from a substrate in which a plurality of blue LED elements (used as a heat source and a light source) are packaged. The green-yellow-red phosphors (average particle size 10μ~20μm) in the fluorescent plate coating are excited by the blue LED light source to emit light of various colors. When these lights are mixed, an illumination such as white is formed. The fluorescent plates developed this time are mainly used for large-scale LED lighting fixtures such as large commercial facilities and factories.
On the surface of the green, yellow and red phosphor particles, a layer of fine special ceramic particles (having a particle size of several nm) is first coated as a bonding layer, and then such particles and ceramic particles forming the coating mother phase (average particle diameter) Mixing 10 μ ~ 20 μm), dispersing it in a solvent to make "ink", and then applying the "ink" to the surface of the heat-resistant glass (inside) as a substrate of the fluorescent sheet by screen printing, and then drying, It is fired to form a coating of a fluorescent sheet. It is estimated that the coating can be adhered to the surface of the glass by the bonding function of the ceramic particles. On the prototype, the thickness of the coating of the green-yellow-red phosphors uniformly dispersed in the ceramic matrix was about 80 μm.
According to Ceratec, ceramic particles are binders for forming coatings, the main component of which is SiO2 ceramics, "phosphor powders are made of YAG (a garnet structure crystal composed of a composite oxide of yttrium and aluminum Y3Al5O12) phosphors and sulfides. Phosphor composition." Generally, moisture in the air easily causes deterioration of the phosphor, but after the phosphor is mixed in the matrix phase of the ceramic particles, moisture can be blocked and durability can be improved.
Makita, a remote phosphor-based LED luminaire supplied by other companies, is estimated to use a resin glue called an organic binder to fix the phosphors. According to Ceratec, "Compared with organic binders, the heat resistance, light resistance and luminous efficiency of the lamps will increase with the mother phase formed by ceramic particles," especially the luminous efficiency will be greatly improved.
Regarding the heat resistance, in the long-term heat resistance test using the prototype, in the exposure test of 2000 hours, at the temperature of 200 ° C, the peeling of the coating from the substrate glass occurred in the test. The sample "heat resistance is above 500 ° C".
Ceratec said that the fluorescent plate developed this time has excellent light resistance, so it can be used for applications such as ultraviolet LEDs and lasers that require excellent light resistance.
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