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Ceramic composite for light conversion and light-emitting device using same

A light-emitting device and composite technology, which is applied in the application of gas discharge lamps, light-emitting materials, electric solid-state devices, etc., can solve the problem of uneven light, and achieve excellent heat resistance, high output, and suppression of uneven light emission. Effect

Active Publication Date: 2015-11-25
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] However, it has been found that the ceramic composite for light conversion obtained by the method described in Patent Document 4 has the following problem: Although the ratio of Gd or Ce is increased to adjust the fluorescence wavelength to, for example, 570 nm or more, it can maintain a high radiation beam, but in Light unevenness occurs in the light emission surface of the ceramic composite for light conversion

Method used

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  • Ceramic composite for light conversion and light-emitting device using same
  • Ceramic composite for light conversion and light-emitting device using same
  • Ceramic composite for light conversion and light-emitting device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Weigh in AlO 3 / 2 Converted to 0.773 moles of α-Al 2 o 3 Powder (purity 99.99%), with TbO 7 / 4 Converted to 0.227×0.997 moles of Tb 4 o 7 Powder (purity 99.9%), 0.227 x 0.003 moles of CeO 2 Powder (purity 99.9%). After the powder was wet-mixed in ethanol by a ball mill for 16 hours, the ethanol was removed using an evaporator to obtain a raw material powder. The raw material powder is pre-melted in a vacuum furnace to obtain a unidirectionally solidified raw material.

[0099] Then, this raw material was directly put into a molybdenum crucible, and it was designed to be unidirectionally solidified by providing a melting holding zone in the upper part and a cooling zone in the lower part with a temperature gradient of 50°C / cm in the vertical direction (solidification direction). The melt holding area of ​​the device, at 1.33 x 10 -3 Pa(10 -5 The raw material is melted under the pressure of Torr). Then, under the same environment, the molybdenum crucible is lowere...

Embodiment 2

[0105] α-Al 2 o 3 Powder (purity 99.99%) with AlO 3 / 2 Converted to 0.773 moles, Tb 4 o 7 Powder (purity 99.9%) with TbO 7 / 4 Converted to 0.227×0.994 mol, CeO 2 The raw material was weighed so that the powder (purity: 99.9%) was 0.227×0.006 mol. A ceramic composite for light conversion of Example 2 was obtained in the same manner as in Example 1 except that the moving speed of the molybdenum crucible was 10 mm / hr. By the same method as in Example 1, it was confirmed that the photoconverting ceramic composite of Example 2 was made of Tb activated by Ce. 3 Al 5 o 12Phase and Al 2 o 3 constituted by phase. Table 1 shows the dominant fluorescence wavelength and relative fluorescence intensity of the obtained ceramic composite for light conversion.

[0106] In addition, except that the thickness of the flat plate-shaped ceramic composite for light conversion was set to 0.14, 0.19, and 0.24 mm, a light-emitting device was produced for each thickness of the ceramic composi...

Embodiment 3

[0108] Weigh in AlO 3 / 2 Converted to 0.773 moles of α-Al 2 o 3 Powder (purity 99.99%), with TbO 7 / 4 Converted to 0.227×0.99 moles of Tb 4 o 7 Powder (purity 99.9%), 0.227×0.01 mol of CeO 2 Powder (purity 99.9%). A ceramic composite for light conversion was obtained by the same method as in Example 1 except that the moving speed of the molybdenum crucible was 10 mm / hr. By the same method as in Example 1, it was confirmed that the photoconverting ceramic composite of Example 3 was made of Tb activated by Ce. 3 al 5 o 12 Phase and Al 2 o 3 constituted by phase. Table 1 shows the dominant fluorescence wavelength and relative fluorescence intensity of the obtained ceramic composite for light conversion.

[0109] In addition, except that the thickness of the flat plate-shaped ceramic composite for light conversion was set to 0.10, 0.15, and 0.19 mm to produce a light-emitting device, the same method as in Example 1 was used to determine the thickness of the flat plate sh...

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Abstract

Provided is a ceramic composite for light conversion, which can make the fluorescence dominant wavelength longer up to 580 nm, further arbitrarily adjust the wavelength in the range of 570 to 580 nm, and undergoes no decrease in fluorescence intensity even when the fluorescence dominant wavelength is made longer, with luminescence unevenness suppressed. Furthermore, a ceramic composite for light conversion is provided which is excellent in heat resistance, and preferred for increasing the output of a white light-emitting device. Furthermore, a light-emitting device is provided which uses the ceramic composite for light conversion mentioned above. The ceramic composite for light conversion is a solidified body including a composition expressed by the following formula (1), where the composition has a structure where at least two oxide phases of a first phase and a second phase are continuously and three-dimensionally entangled mutually, and the ceramic composite for light conversion is characterized in that the first phase is a (Tb, Y) 3 Al 5 O 12 phase activated with Ce for producing fluorescence, whereas the second phase is an Al 2 O 3 phase.

Description

technical field [0001] The present invention relates to a ceramic composite body for light conversion used in light-emitting devices such as light-emitting diodes that can be used in displays, lighting, and backlight sources. Background technique [0002] In recent years, research and development of white light-emitting devices using blue light-emitting elements as light-emitting sources has been extensively carried out. In particular, white light-emitting diodes using blue light-emitting diode elements are expected to rapidly increase in demand in the future because they are light in weight, do not use mercury, and have a long life. Furthermore, a light emitting device using a light emitting diode element as a light emitting element is called a light emitting diode (LED). As a method of converting blue light from a blue light-emitting diode element into white light, the most commonly performed method is to obtain a similar white color by mixing with yellow, which has a com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/08C09K11/80H01L33/50
CPCC09K11/7774C04B35/117C04B35/44C04B35/652C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/764C04B2235/80H01L33/502Y02B20/181H01L2224/16225Y02B20/00
Inventor 射场久善石飞信一市薗泰之
Owner UBE IND LTD
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