TWI498599B - Method for manufacturing a low temperature glass phosphor lens and the lens manufactured thereof - Google Patents

Description

Method for manufacturing low temperature glass phosphor lens and lens made by the same

The present invention relates to a lens that can be applied to a white light illumination module or as a package structure for a light emitting diode.

In recent years, white light-emitting diodes have gradually replaced traditional light bulb sources because of their long service life, small size, and good luminous efficiency, making them the products most concerned by consumers.

Referring to FIG. 1 , a white light emitting diode of the present invention has a substrate 10 , a short-wavelength light-emitting diode 11 disposed on the substrate 10 , and a short-wavelength LED 11 disposed on the short-wavelength LED 11 . The one color conversion layer 12 and the color conversion layer 12 and the short wavelength light emitting diode 11 are sealed by one of the package elements 13. The short-wavelength light-emitting diode 11 emits a short-wavelength light, and the color conversion layer 12 excites complementary light complementary to the light by the light emitted by the short-wavelength light-emitting diode 11 and The light and the complementary light form a white light using the principle of color mixing. For example, most of the current use of a blue light wafer with a polymer fluorescent glue coated on a blue light wafer, such that the blue light penetrates the polymer fluorescent glue, and is mixed to form a white light source; wherein the polymer fluorescent glue system Contains yttrium aluminum garnet (YAG) phosphor and silicone.

In general, if the thermal energy generated by the light-emitting diode is not able to be derived, the junction temperature of the light-emitting diode will be too high, thereby affecting the product life cycle, luminous efficiency and stability. For example, when a blue light wafer needs to be applied to a high-brightness occasion and a higher power is required, the thermal energy generated on the surface of the blue light wafer will cause the silicone rubber to deteriorate rapidly, which will cause the lumen loss of the light-emitting source to be intensified, and the chromaticity drift tends to be severe. Poor quality stability.

On the other hand, since the glass has good light transmittance and has the ability to be uniformly mixed with the fluorescent powder, the inventors propose to replace the silicone with a glass material having better heat resistance and mix and sinter with the fluorescent powder to form A glass phosphor having both glass characteristics and fluorescent characteristics, and greatly improving the intrinsic limitation of the temperature of the polymer material, and thus is an LED packaging material which is less susceptible to aging caused by the thermal energy emitted from the LED wafer.

Nevertheless, the processing temperature of the glass material is generally above 1000 ° C. In addition to increasing the difficulty in the process, the structure of the phosphor powder is easily destroyed during the high temperature processing process and the fluorescent power is lost.

In view of this, the inventors have conceived and further studied, and finally invented a method for manufacturing a low-temperature glass phosphor lens and a lens made by the method.

The invention is a method for manufacturing a low-temperature glass phosphor lens and a lens made by the method thereof, and the main object thereof is to provide a glass phosphor lens having high thermal stability and low process temperature.

To achieve the foregoing objective, the present invention provides a method of manufacturing a low temperature glass phosphor lens which is formed by sintering a low temperature glass material and a phosphor powder, the method comprising the following steps: (a) a mixing sintering step: Drying the glass material with the fluorescent powder to form a mixture of powder or granules; (b) mixing the mixture: grinding the mixture to a particle size of 15 μm to 20 μm to obtain a uniformly mixed glass fluorescing (c) hot press forming step: hot pressing the glass phosphor into a glass phosphor at a temperature of 500 ° C to 1000 ° C; and (d) processing forming step: grinding the glass phosphor, Polished into a lens.

Preferably, the phosphor powder is selected from the group consisting of yttrium aluminum garnet (YAG), nitride (Nitride) and silicate (silicate), the glass material is selected from the group consisting of bismuth citrate A group of systems, phosphate systems, borate systems, and citrate systems.

The invention utilizes the provided method for manufacturing a low-temperature glass phosphor lens and the lens made by the method, and the effect obtained by mixing and sintering with the fluorescent powder by replacing the conventional silicone with a glass phosphor is formed. A glass phosphor having both glass characteristics and fluorescent characteristics, and thus is an LED packaging material which is less susceptible to aging caused by thermal energy emitted from the LED wafer; in addition, by controlling the process temperature below 1000 ° C, the reduction can be reduced In addition to equipment costs, the structure of the phosphor powder can be kept stable.

With regard to the techniques, means and other functions of the present invention for achieving the above objects, a preferred embodiment is described in detail in conjunction with the drawings. As shown later.

[study]

10‧‧‧Substrate

11‧‧‧Short-wavelength light-emitting diodes

12‧‧‧Color conversion layer

13‧‧‧Package components

[this creation]

20‧‧‧ lens

20B‧‧ lens

20C‧‧ lens

20D‧‧ lens

21‧‧‧ glass phosphor

22‧‧‧glass materials

23‧‧‧Fluorescent powder

30‧‧‧Substrate

31‧‧‧ wafer

32‧‧‧PMMA lens

Figure 1 is a schematic diagram of a conventional LED module package structure.

Figure 2 is a schematic view of an embodiment of the invention.

Figure 3 is a schematic view of another embodiment of the present invention.

Figure 4 is a schematic view of still another embodiment of the present invention.

Figure 5 is a schematic view of still another embodiment of the present invention.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

In order to enable the reviewing committee to have a better understanding and understanding of the purpose, features and effects of the present invention, please refer to the following [detailed description of the drawings] as follows. In the embodiment of the present invention, a low temperature manufacturing method will be described. Method of glass phosphor lens and lens made by the method: Referring to FIG. 2, the lens 20 is made of a glass phosphor 21 which is sintered by a glass material 22 and a phosphor powder 23. The phosphor powder 23 is selected. a group of free yttrium aluminum garnet (YAG), nitride (Nitride) and silicate (silicate) fluorescent materials selected from the group consisting of a citrate system, a phosphate system, and a borate system And the group formed by the citrate system.

Preferably, the glass material 22 is composed of 70% by weight of SiO ₂ , 20% by weight of Na ₂ O, 7% by weight of Al ₂ O ₃ and 10% by weight of CaO.

As shown in FIG. 2, the present invention includes a substrate 30, a wafer 31, and a lens 20, wherein the wafer 31 is fixed on the substrate 30, and the wafer 31 is used for A light source is generated. The lens 20 is a curved surface that is disposed at two ends of the substrate 30. The wafer 31 is received between the substrate 30 and the lens 20. The light source of the wafer 31 is directed toward The lens 20 is projected outside.

The method for manufacturing the low-temperature glass phosphor lens of the present invention is mainly manufactured by using the foregoing glass material 22 and the phosphor powder 23, wherein the method step comprises: (a) a mixing sintering step: the glass material 22 and The phosphor powder 23 is dry-mixed to form a mixture of powder or granules; for example, the glass material 22 and the phosphor powder 23 can be placed in a rotary mixer and stirred for 30 to 60 minutes to obtain the mixture. (b) Mixture grinding step: grinding the mixture to a particle size of 15 μm to 20 μm to obtain a uniformly mixed glass phosphor; for example, the mixture may be ground in a mortar for 20 to 30 minutes to obtain the glass fluorescent film. (c) hot press forming step: hot pressing the glass phosphor powder into a glass phosphor 21 at a temperature of 500 ° C to 1000 ° C; and (d) processing forming step: the glass phosphor 21 Grinding and polishing into a lens 20.

Wherein, the glass material 22 can be subjected to the following steps in advance: (a1) a low-temperature sintering step: placing a glass material in a container and performing low-temperature sintering at 1000 ° C to 1500 ° C; (a2) quenching molding step: The glass material is placed in water, alcohol or liquid nitrogen to be cooled, and the low temperature glass material is cooled to form the glass material 22; (a3) grinding step: the glass material 22 is ground to a particle diameter of 15 μm to 20 μm.

The inventor of the present invention has specifically stated that the structure of the lens 20 may be different according to actual needs, and may be a single glass phosphor lens, or may be combined with other optical films having light field correction characteristics, for example, Referring to FIG. 2, it is a single aspherical curved glass phosphor lens 20; or as shown in FIG. 3, it is a single planar glass phosphor lens 20B; or as shown in FIG. As shown in the figure, it is a lens 20C of a single lenticular glass phosphor; as shown in Fig. 5, a PMMA lens 32 can be attached to one end of the lens 20D of the glass phosphor.

The present invention mixes and sinters with the phosphor powder 23 by replacing the conventional silicone rubber with the glass material 22 to form a glass phosphor 21 having both glass characteristics and fluorescent characteristics, and thus is emitted from a wafer which is not susceptible to the light-emitting diode. The thermal energy affects the light-emitting diode packaging material which causes aging phenomenon; in addition, by controlling the process temperature below 1000 ° C, in addition to reducing the equipment cost, the structure of the fluorescent powder 23 can be kept in a stable state. In addition, the present invention by using phosphor powder 23 It is mixed with the glass material 22, and has the functions of a color conversion layer and a lens, and thus has the effects of color conversion and light field correction.

From the above, it is known that the present invention truly conforms to "industrial availability," "novelty," and "progressiveness", and submits an invention patent application in accordance with the law, praying for review and early granting of a patent, and it is truly sensible.

20‧‧‧ lens

21‧‧‧ glass phosphor

22‧‧‧glass materials

23‧‧‧Fluorescent powder

30‧‧‧Substrate

31‧‧‧ wafer

Claims (8)

A low temperature glass phosphor lens made of a material comprising a glass material and a phosphor powder; characterized in that the phosphor powder is selected from the group consisting of yttrium aluminum garnet (YAG), nitride (Nitride) and tannic acid A group of phosphorescent materials consisting of at least SiO ₂ , Na ₂ O, CaO, and Al ₂ O ₃ in a composition ratio. The low temperature glass phosphor lens of claim 1, wherein the lens is a planar lens, an aspherical lens or a microlens. The low temperature glass phosphor lens of claim 1, wherein a PMMA lens is further attached to the lens. The low-temperature glass phosphor lens of claim 1, wherein the lens is disposed at two ends of a substrate, and a wafer is disposed between the substrate and the lens, and the chip is used to generate a light source. The light source is projected outside the lens. The method for producing a low-temperature glass phosphor lens according to claim 1, wherein the glass material is composed of 70 wt% of SiO ₂ , 20 wt% of Na ₂ O, 7 wt% of Al ₂ O ₃ and 10 wt%. % CaO is composed. A method for producing a low-temperature glass phosphor lens, which is prepared by using a glass material and a phosphor powder as described in claim 1, wherein the method comprises the following steps: (a) mixing step: a glass material Dry mixing with a fluorescent powder to form a mixture of powder or granules; (b) mixing step of the mixture: grinding the mixture to a particle size of 15 μm to 20 μm to obtain a uniformly mixed glass phosphor powder; (c) a hot press forming step: hot pressing the glass phosphor powder into a glass phosphor at a temperature of 500 ° C to 1000 ° C; and (d) processing forming step: grinding and polishing the glass phosphor a lens. The method for manufacturing a low-temperature glass phosphor lens according to claim 6, wherein the glass material is subjected to the following steps: (a1) a low-temperature sintering step: placing a glass material in a container, and Low temperature sintering at 1000 ° C to 1500 ° C; (a2) quenching step: cooling the glass material in water, alcohol or liquid nitrogen to cool the low temperature glass material to form the glass material; and (a3) grinding step : The glass material is ground to a particle size of 15 μm to 20 μm. The method for producing a low-temperature glass phosphor lens according to claim 6 or 7, wherein the phosphor powder is selected from the group consisting of yttrium aluminum garnet (YAG), nitride (Nitride), and silicate (Silicate). A group of fluorescent materials consisting of 70% by weight of SiO ₂ , 20% by weight of Na ₂ O, 7% by weight of Al ₂ O ₃ and 10% by weight of CaO.