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Luminescent ceramics and wavelength converter

A technology of wavelength conversion device and luminescent ceramics, applied in luminescent materials, chemical instruments and methods, electrical components, etc., can solve problems such as the reduction of luminous amount, and achieve the effect of being less prone to light degradation

Active Publication Date: 2020-02-21
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, the following Patent Document 2 describes that when a phosphor is exposed to light with a high energy density for a long time, the amount of light emitted gradually decreases.

Method used

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  • Luminescent ceramics and wavelength converter
  • Luminescent ceramics and wavelength converter
  • Luminescent ceramics and wavelength converter

Examples

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experiment example

[0048] Next, the present invention will be further described in detail by describing experimental examples of the luminescent ceramics of the present invention. In addition, this invention is not limited to the following experimental example.

[0049] Hereinafter, the present invention will be described more specifically by giving specific experimental examples of the present invention.

experiment example 1

[0051] As a raw material, prepare La(OH) 3 、Gd 2 o 3 , Y 2 o 3 , Yb 2 o 3 、Lu 2 o 3 , ZrO 2 , HfO 2 , SnO 2 , Nb 2 o 5 、 Ta 2 o 5 , Sb 2 o 3 and Bi 2 o 3 . These raw materials were weighed so that the compositions shown in the molar ratios in Table 1 below were obtained, and wet mixing was performed for 20 hours using a ball mill. After drying the obtained mixture, it baked at 1300 degreeC for 3 hours, and obtained the baked product. The obtained calcined product was put into a ball mill together with water and an organic dispersant, and wet pulverized for 12 hours. Using the obtained pulverized product, it was molded into a disk-like shape with a diameter of 30 mm and a thickness of 5 mm by a wet molding method. The obtained molded product was embedded in a powder having the same composition as the molded product, and fired at a temperature of 1700°C for 20 hours in an oxygen atmosphere (about 98 vol% oxygen concentration). Thus a sintered body was obtai...

experiment example 2

[0069] In the same manner as in Experimental Example 1, samples for evaluation of Sample No. 15 to Sample No. 42 shown in Table 2, Table 3, and Table 4 below were obtained.

[0070] For each of the obtained samples for evaluation, the quantum yield, in-line transmittance, and relative luminous intensity were determined in the same manner as in Experimental Example 1. The results are shown in Table 2, Table 3 and Table 4 below. It should be noted that the feed composition ratios in Table 2, Table 3, and Table 4 are molar ratios, and are values ​​normalized so that X+Y+Z=2.0. In addition, the values ​​of X, Y, and Z were set so as to satisfy 3X+4Y+5Z=7.0 or its vicinity similarly to Experimental Example 1. The values ​​of X, Y, and Z are also shown together in Table 2, Table 3, and Table 4 below.

[0071]

[0072] Sample No. 15 to Sample No. 18 in Table 2 show the results when Ta is the pentavalent ion Z=0.050 and the total charge of the cation, that is, 3X+4Y+5Z deviates f...

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Abstract

Provided are luminescent ceramics in which photodegradation does not tend to occur. The luminescent ceramics comprise a pyrochlore compound comprising at least 0.01 mol% of Bi with respect to 100 mol%of general formula M1XM2YM3ZOW (where M1 is at least one element selected from the group consisting of La, Y, Gd, Yb, and Lu, M2 is at least one element selected from the group consisting of Zr, Sn,and Hf, M3 is at least one element selected from the group consisting of Ta, Nb, and Sb, and X, Y, Z, and W are positive numbers to maintain electrical neutrality), wherein when X+Y+Z=2.0, 0.005<=Z<=0.2, and wherein 3X+4Y+5Z is 7.02 or less.

Description

technical field [0001] The present invention relates to a luminescent ceramic and a wavelength conversion device using the luminescent ceramic. Background technique [0002] Conventionally, there are known luminescent ceramics that, when irradiated with light, emit light having a wavelength different from that of the irradiated light. The luminescent ceramics described in the following Patent Document 1 are prepared by treating ABO in a reducing atmosphere. W (Wherein, A contains at least one selected from La, Y, Gd, Yb and Lu, B contains at least one selected from Zr, Sn and Hf and Bi, W is a positive number for maintaining electrical neutrality ) is obtained by heat-treating ceramics mainly composed of pyrochlore-type compounds. [0003] In addition, Patent Document 2 below describes that when a phosphor is exposed to light with a high energy density for a long period of time, the amount of light emitted gradually decreases. [0004] prior art literature [0005] paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCH01L33/502C04B2235/76C04B2235/9653C04B2235/9646C04B35/486C04B2235/3227C04B2235/3251C04B2235/3298C04B35/495C04B35/50C04B2235/3294C04B2235/3225C04B2235/3224C04B35/505C04B2235/6567C04B35/62615C04B2235/6585C04B2235/6584C04B2235/6581C04B2235/664C04B2235/3244C04B2235/3293
Inventor 吴竹悟志
Owner MURATA MFG CO LTD
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