KR101004845B1 - Phosphor element, led device using thereof and methods for manufacturing thereof - Google Patents

Abstract

The present invention is an optical fiber; And it provides a phosphor device comprising a fluorescent material applied to the end of the optical fiber.

The present invention also provides a LED device comprising a phosphor unit consisting of an LED light source and a plurality of phosphor elements, wherein the phosphor element comprises an optical fiber and a fluorescent material applied to the ends of the optical fiber.

LED, light emitting device, white light emitting, phosphor

Description

Phosphor element, LED device using same, and manufacturing method thereof {PHOSPHOR ELEMENT, LED DEVICE USING THEREOF AND METHODS FOR MANUFACTURING THEREOF}

The present invention relates to a phosphor device, an LED device using the same, and a method for manufacturing the same. More specifically, the phosphor device is low in light loss, and can realize light having various color temperatures, colors, and color rendering indexes, and an LED device using the same. And methods for their preparation.

Recently, LED (Light Emitting Diode) has attracted attention as an environmentally friendly light source that does not contain a substance causing pollution, and in particular, a white LED device that can be used for lighting has been attracting attention. There are the following methods for generating white light for lighting using the LED device.

First, there is a method of producing white light by mixing the three colors by manufacturing LEDs emitting red, green, and blue light into one package. However, this method has a disadvantage in that the manufacturing cost is high, the driving circuit is complicated, the size of the product is increased, and the temperature characteristics of each light emitting diode are different, which may adversely affect the optical properties and reliability of the product.

Next, there is a method of converting one color of light emitted from the LED into white through the phosphor. For example, there is a method of converting blue light emitted from a blue LED into white light using a yellow phosphor such as Yttrium Aluminum Garnet (YAG). However, this method has a problem in that the color rendering index is poor and the color is not properly expressed, and therefore, it is not suitable for use for lighting that requires high color rendering.

In another method of generating white light using an LED, a UV LED is used as a light source, and a composition in which red, green, and blue phosphors are mixed or red, green, and blue phosphors are sequentially stacked on the light source to be converted into white light. There is a way. However, in the method of emitting white light by combining red, green, and blue phosphors, light loss occurs because light excited in the blue phosphor is excited again by the red phosphor or green phosphor, and the light passes through the phosphor many times. As a result, refraction and reflection occur, and thus the emission efficiency is further reduced. In addition, since it is difficult to control the combination of the phosphor, there is also a problem that it is difficult to implement a light having a desired color and color rendering index.

The present invention is to solve the problems as described above, to provide a phosphor device, a LED device using the same and a method of manufacturing the same that has a low light loss, and can realize a light having a variety of color temperature, color and color rendering index The purpose.

To this end, the present invention is an optical fiber; And it provides a phosphor device comprising a fluorescent material laminated on the end of the optical fiber.

In this case, the optical fiber preferably has a cross-sectional diameter of about 100 μm to about 1 mm, and the fluorescent material may be a red fluorescent material, a green fluorescent material, or a blue fluorescent material.

In addition, the fluorescent material is preferably laminated in a hemispherical shape.

On the other hand, the phosphor element may be manufactured by spraying a fluorescent material on the end of the optical fiber or the phosphor element by immersing the end of the optical fiber in the fluorescent material.

The present invention also provides a LED device comprising a phosphor unit consisting of an LED light source and a plurality of phosphor elements, wherein the phosphor element comprises an optical fiber and a fluorescent material applied to the ends of the optical fiber.

At this time, the fluorescent material is preferably of the liquid type (liquid type).

In addition, the LED light source is preferably a UV LED, the phosphor unit may include two or more kinds of phosphor elements stacked with different phosphors, in particular phosphor elements stacked with red phosphor material, green phosphor material is stacked It can be made of a combination of the phosphor element and the phosphor element laminated blue phosphor.

On the other hand, the phosphor unit is preferably the bottom surface is cut in the hemispherical form.

In addition, the present invention comprises the steps of preparing a phosphor device by laminating a phosphor on the optical fiber terminal; Combining the phosphor elements to form a phosphor unit; And stacking the phosphor unit on the LED light source.

The LED device manufacturing method of the present invention may further comprise the step of cutting the lower surface of the phosphor unit in a hemispherical shape.

When using the phosphor element of the present invention, light loss is reduced because each phosphor element absorbs light independently and is not affected by other phosphors.

In addition, by changing the combination of individual phosphor elements included in the phosphor unit, it is possible to implement light having various color temperature, color and color rendering index.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 shows a phosphor element of the present invention. As shown in FIG. 1, the phosphor element of the present invention includes an optical fiber 10 and a fluorescent material 20 laminated at an end of the optical fiber.

The optical fiber 10 is a fibrous waveguide for transmitting light, and has a double cylindrical structure that forms a center of a material having a high refractive index and surrounds the outside of the center with a material having a low refractive index. Since the optical fiber has a higher refractive index at the center than the outside, light is transmitted through total reflection and has very little energy loss. In general, the optical fiber has a cross-sectional diameter of several hundred μm to several mm, and the refractive index is about 1.4 to 1.5.

In this invention, it is preferable to use the optical fiber whose cross-sectional diameter is 1 mm or less, Preferably it is 100um-1mm. This is because, when the cross-sectional diameter of the optical fiber is less than 100um, it is difficult to manufacture, and when the phosphor unit to be described later is formed when it exceeds 1mm, the gap between the phosphor elements becomes large and light loss increases.

On the other hand, the fluorescent material 20 refers to a material that converts various excitation energies such as photons, electrons, heat, and electric fields to emit visible light, and synthesizes an appropriate activator ion and a parent material to obtain a desired emission wavelength. . The excitation energy transferred through the parent of the phosphor is converted from the activator ions into visible light to emit light. At this time, the emission wavelength is determined by a combination of a given parent and an active agent doped in the parent, and each phosphor has a unique emission wavelength. Various fluorescent materials for LEDs are currently being developed and used, and the present invention can be implemented using the fluorescent materials 20 well known in the art. For example, by applying red, green, and blue phosphors to the ends of the optical fiber 10, a red phosphor, a green phosphor, and a blue phosphor may be manufactured, and white light may be realized by appropriately combining them.

On the other hand, in the phosphor device of the present invention, the fluorescent material stacked on the optical fiber terminal is not limited thereto, but is preferably stacked in a hemispherical shape as shown in FIG. This is because the transmittance is best when the fluorescent material is formed in a hemispherical shape.

To this end, in the present invention, it is preferable to use a liquid type (liquid type) rather than a powder type as a fluorescent material. This is because, when the liquid type fluorescent material is used, the fluorescent material may be formed in a hemispherical shape by surface tension.

When the light is incident on the phosphor element 1 of the present invention made as described above, the incident light is moved along the optical fiber 10 to reach the fluorescent material 20 laminated at the end of the optical fiber, to excite the fluorescent material It generates light with one color. As described above, since the phosphor device of the present invention independently absorbs light without being affected by other phosphors in the surroundings, it solves the light loss problem generated by the re-absorption of light excited by the existing blue phosphor into the red phosphor or the green phosphor. It becomes possible.

The phosphor device of the present invention may be manufactured by spraying a desired phosphor, that is, a red, green or blue phosphor on the optical fiber bundle. In addition, the end of the optical fiber bundle may be immersed in the fluorescent material to be produced by the method to bury the fluorescent material on the optical fiber terminal. In the case of manufacturing the phosphor element of the present invention by such a method, the manufacturing method is simple, and a large number of phosphor elements can be manufactured at one time by using an optical fiber bundle, so the manufacturing cost is low and the process time is short.

Next, the LED device of this invention using the said fluorescent element is demonstrated.

The LED device of the present invention comprises an LED light source, a phosphor unit consisting of a plurality of phosphor elements on top of the light source, wherein the phosphor element comprises an optical fiber and a fluorescent material applied to the ends of the optical fiber. do.

2 shows an embodiment of the LED device of the present invention. As shown in FIG. 2, in the LED device 100 of the present invention, the light source 120 is disposed in a recess of the casing 120, and the phosphor unit 130 may be stacked thereon.

In this case, the light source is for supplying energy to the fluorescent material, and light sources generally used in the art may be used in the present invention. For example, in the present invention, a monochromatic LED or a UV LED may be used as the light source.

On the other hand, the phosphor unit 130 is composed of a plurality of phosphor elements of the present invention described above. The phosphor unit 130 of the present invention may be made of one kind of phosphor elements having the same emission spectrum, or may be made of a combination of two or more kinds of phosphor elements having different emission spectra. For example, the LED device of the present invention can be made by using a blue LED as a light source, and laminated a phosphor unit composed of phosphor elements stacked with yellow phosphors thereon, using a UV LED as a light source, and FIG. 2. As shown in FIG. 5, a phosphor unit including a combination of a phosphor element 131 on which a blue phosphor material is stacked, a phosphor element phosphor element 132 coated with a red phosphor material, and a green phosphor element 133 is disposed on a UV LED. It may be made by laminating.

In the case of the phosphor unit 130 of the LED device of the present invention, since each phosphor element is independently present by an optical fiber, it is not affected by other phosphor elements. That is, since the light generated from the light source is moved through the optical fiber, it is not influenced by other phosphor elements, and as a result, the light loss generated when the light excited by the blue phosphor is reabsorbed by the red or green phosphor is significantly reduced. Can be.

In addition, in the phosphor unit 130 of the present invention, since the phosphor elements are independently present by the optical fiber, it is possible to easily change the combination of the phosphor elements included in the phosphor unit, and as a result, the desired color temperature, color and color rendering index It is possible to realize the light having a relatively accurate.

 On the other hand, the phosphor unit 130, but is not limited to this, as shown in Figure 3, it is preferable that the lower surface 140 is formed in a hemisphere cut shape. This is because when the lower surface of the phosphor unit 130 is formed in a hemispherical shape, the transmittance of light emitted from the light source is improved, and as a result, the light utilization efficiency is improved.

The LED device of the present invention is manufactured by stacking a fluorescent material at an optical fiber terminal to produce a phosphor element, combining the phosphor elements to form a phosphor unit, and stacking the phosphor unit on the light source. Can be.

As described above, the phosphor element may be manufactured by spraying a fluorescent material on the optical fiber bundle or immersing the end of the optical fiber bundle in the fluorescent material.

When the phosphor element is manufactured by the method as described above, the phosphor elements are combined at a desired ratio to form a phosphor unit. The phosphor unit may be formed by fixing optical fibers of the phosphor element using an adhesive or the like.

After forming a phosphor unit to which phosphor elements are combined, a step of cutting the lower surface of the phosphor unit into a hemispherical shape may be performed as necessary. As described above, when the lower surface of the phosphor unit is formed in a hemispherical shape, the transmittance of light emitted from the light source is improved.

When the phosphor unit is formed through the above process, the phosphor unit is stacked on the light source to manufacture an LED device. In this case, the phosphor unit may be fixed on the light source using a transparent binder such as an epoxy resin or a silicone resin.

The above-described embodiments and the accompanying drawings are only examples for describing the present invention, but the present invention is not limited thereto. In addition, the invention described in the claims of the present invention can be substituted, modified and changed in various forms without departing from the technical spirit.

1 is a view for explaining a phosphor element of the present invention.

2 is a view for explaining an embodiment of the LED device of the present invention.

3 is a view for explaining an embodiment of the phosphor unit of the present invention.

Claims (14)

delete Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The optical fiber is a phosphor element, characterized in that the cross section diameter of 100㎛ to 1mm. Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The fluorescent material is a phosphor, characterized in that the red phosphor, green phosphor or blue phosphor. Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The phosphor is laminated in hemispherical phosphor element. Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The phosphor is laminated on the optical fiber terminal by spraying the fluorescent material on the optical fiber terminal. Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The phosphor is laminated on the end of the optical fiber by immersing the optical fiber end in the fluorescent material. Optical fiber; And Comprising a fluorescent material laminated on the end of the optical fiber, The fluorescent material is a liquid crystal device, characterized in that the liquid type (liquid type). LED light source; A phosphor unit composed of a plurality of phosphor elements on top of the LED light source, The phosphor device includes an optical fiber and a fluorescent material applied to the end of the optical fiber. The method of claim 8, LED device, characterized in that the LED light source is a UV LED. The method of claim 8, The phosphor unit LED device, characterized in that it comprises two or more phosphor elements stacked on different phosphors. The method of claim 10, The phosphor unit is a LED device, characterized in that consisting of a combination of phosphor elements stacked with a red phosphor material, phosphor elements stacked with a green phosphor material and phosphor elements stacked with a blue phosphor material. The method of claim 8, The phosphor unit is a LED device, characterized in that the bottom surface is formed in a hemispherical shape. Stacking a phosphor on an optical fiber terminal to produce a phosphor device; Combining the phosphor elements to form a phosphor unit; And Stacking the phosphor unit on top of the LED light source. The method of claim 13, And cutting the lower surface of the phosphor unit into a hemispherical shape after the forming of the phosphor unit.

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