Silica glass member for hermetic sealing of ultraviolet SMD LED element and method for manufacturing quartz glass member for ultraviolet LED

Pending Publication Date: 2021-07-22
SHIN ETABU QUARTZ PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0059]First, the present invention exhibits the remarkable effect capable of providing the silica glass member to be used for hermetic sealing of an ultraviolet LED configured to emit ultraviolet light in a wavelength range of from 200 nm to 350 nm, in particular, the silica glass member for hermetic sealing of an ultraviolet SMD LED element to be suitably used for hermetic sealing of, and as a transmission window material for, a surface mount-type package (SMD) having an ultraviolet LED mounted thereon and configured to e

Problems solved by technology

However, a range of use of the gas light source is limited because of its short lifetime, its emission wavelength, which is limited only to an emission line of a gas, a substance contained therein that is harmful to a human body/environment, such as mercury, and an extremely large size and power consumption of the light source.
The ultraviolet LED emits light having a wavelength of from 200 nm to 400 nm, and has a problem in that a lens made of a silicone resin, which has hitherto been used for a visible light LED, undergoes deterioration of the resin or does not transmit the light.
In addition, there is also a problem in that light extraction efficiency from an ultraviolet LED element is extremely low.
However, there are problems in that, with a window plate made of quartz glass, light is diffused, and hence a desired light intensity is not obtained, and a hemispherical lens is difficult to mount on a package.
This method can provide a transparent quartz glass body by degreasing and purifying a molded body, followed by firing, but has a problem in that purification treatment with chlorine or hydrogen chloride generates an optical absorption band at a wavelength of about 250 nm (5.0 eV) due to an oxygen-deficient defect (N

Method used

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  • Silica glass member for hermetic sealing of ultraviolet SMD LED element and method for manufacturing quartz glass member for ultraviolet LED
  • Silica glass member for hermetic sealing of ultraviolet SMD LED element and method for manufacturing quartz glass member for ultraviolet LED
  • Silica glass member for hermetic sealing of ultraviolet SMD LED element and method for manufacturing quartz glass member for ultraviolet LED

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

[0091](Formation of Plastic Matter)

[0092]79 Parts by weight of mixed powder obtained by mixing spherical synthetic silica powder having a diameter of 1.2 μm (product name: ADMAFINE SO-E3) and spherical synthetic silica powder having a diameter of 2 μm (product name: ADMAFINE SO-E5) at a weight ratio of 1:1, 20 parts by weight of an aqueous solution of 7.8 wt % METOLOSE (product name: SM-4000), and 1 part by weight of a lubricant (product name: UNILUBE 50 MB-2) were mixed and then kneaded with a triple roll mill to form plastic matter. The term “plastic matter” as used herein refers to a kneaded product of silica glass powder, in a state of having higher viscosity than a slurry, and having hardness and plasticity comparable to those of a clay.

[0093](Degassing Operation)

[0094]The formed plastic matter is degassed by being further kneaded under reduced pressure. Specifically, for example, kneading extrusion is performed using a kneading extrusion molding machine manufactured b...

Example

Comparative Example 1

[0118]A planar silica glass plate material and a hemispherical lens were each independently produced, polished, and bonded to each other using any of adhesives A to E described below to produce a silica glass member having a shape similar to that of Example 1, which was subjected to transmittance measurement. The results are shown in FIG. 8. In FIG. 8, for comparison, the transmittance of the silica glass member of Example 1 is also shown. As apparent from FIG. 8, all the silica glass members joined with the adhesives were found not to have sufficient transmission properties for UVB (falling within a wavelength range of from 315 nm to 280 nm) and UVC (falling within a wavelength range of from 280 nm to 200 nm).

[0119]The adhesives A to E are as described below.

[0120]Adhesive A: vinyl chloride resin-based adhesive AR-066 manufactured by Cemedine Co., Ltd. (for bonding a vinyl chloride tube)

[0121]Adhesive B: thermosetting silicone-based adhesive KE-1886 manufacture...

Example

Example 2

[0125](Molding Step)

[0126]79 Parts by weight of mixed powder obtained by mixing powder having an average particle diameter of 1.0 μm (ADMAFINE SO-E3 manufactured by Admatechs Company Limited) and powder having an average particle diameter of 2.0 μm (ADMAFINE SO-E5 manufactured by Admatechs Company Limited) at a weight ratio of 1:1, 20 parts by weight of an aqueous solution of 7.8% methylcellulose (METOLOSE SM-4000 manufactured by Shin-Etsu Chemical Co., Ltd.), and 1 part by weight of a lubricant (UNILUBE 50 MB-2 manufactured by NOF Corporation) were mixed and then kneaded with a triple roll mill. Through the use of a vacuum extrusion molding machine, the mixture was degassed, and subjected to kneading extrusion under a reduced pressure of 0.1 MPa.

[0127]The mixture of the silica powder and the binder subjected to the degassing treatment was injection-molded into a metal mold at an increased pressure of 120 MPa to provide a molded body having a predetermined shape. Here, with...

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Abstract

Provided is a silica glass member for hermetic sealing of an ultraviolet SMD LED element to be suitably used for hermetic sealing of, and as a transmission window material for, a surface mount-type package (SMD) having an ultraviolet LED mounted thereon and configured to emit ultraviolet light in a wavelength range of from 200 nm to 350 nm. The silica glass member for hermetic sealing includes a silica glass substrate, which is homogeneously and integrally formed without an internal boundary, wherein the silica glass substrate has: a first surface on an inside opposed to an SMD LED element; and a second surface on an outside corresponding to the first surface, wherein an outer peripheral portion of the first surface has formed therein a substrate joining plain surface for joining to the container outer periphery joining plain surface, and wherein the second surface on the outside corresponding to the first surface has formed therein a lens-like convex portion configured to process emitted light from the ultraviolet SMD LED element.

Description

TECHNICAL FIELD[0001]The present invention firstly relates to a silica glass member to be used for hermetic sealing of an ultraviolet LED configured to emit ultraviolet light in a wavelength range of from 200 nm to 350 nm, and more specifically, to a silica glass member to be suitably used for hermetic sealing of, and as a transmission window material for, a surface mount-type package (commonly called a surface mount device (SMD)) having an ultraviolet LED mounted thereon and configured to emit ultraviolet light in a wavelength range of from 200 nm to 350 nm. The present invention secondly relates to a method of manufacturing a quartz glass member for an ultraviolet LED at a wavelength of from 200 nm to 400 nm.BACKGROUND ART[0002]An ultraviolet LED configured to emit light in a deep ultraviolet wavelength band is expected to be applied in a wide range of fields, such as virus sterilization, drinking water, air purification, resin curing, decomposition of environmental pollutants, a ...

Claims

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Application Information

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IPC IPC(8): H01L33/58C03B19/06H01L25/075H01L33/48
CPCH01L33/58C03B19/066H01L33/32H01L33/486C03B2201/04H01L25/0753C03C3/06C03C4/0085F21V5/00C03B2201/03C03C2201/02H01L2933/0058G02B19/0061F21Y2115/10F21V5/007C03C2201/80C03C2201/23C03C2203/54C03B20/00H01L33/56
Inventor FUJINOKI, AKIRANISHIMURA, HIROYUKISATO, AKIRAYOKOSAWA, YUYAMORI, TATSUYA
Owner SHIN ETABU QUARTZ PRODS
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