Wavelength conversion member and method for manufacturing same, and light-emitting device
A wavelength conversion and manufacturing method technology, applied in the direction of luminescent materials, lighting devices, chemical instruments and methods, etc., can solve the problems of discoloration, mold resin degradation, deformation, etc., and achieve the effect of suppressing the decline of luminous intensity
Pending Publication Date: 2019-07-12
NIPPON ELECTRIC GLASS CO LTD
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Problems solved by technology
However, when using this wavelength conversion member, there is a problem that the luminance of the light-emitting device tends to decrease due to deterioration of the resin due to the light from the excitation light source.
In particular, there is a problem of discoloration or deformation due to deterioration of the mold resin due to heat generated by the excitation light source or high-energy short-wavelength (blue to ultraviolet) light.
Method used
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Experimental program
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Effect test
Embodiment
[0076] Hereinafter, the wavelength conversion member of the present invention will be described in detail using examples, but the present invention is not limited to the following examples.
[0077]Table 1 shows Examples (No. 1-10) and Comparative Examples (No. 11-13) of the present invention.
[0078] [Table 1]
[0079]
[0080] Mixed powder was obtained by mixing the thermally conductive filler, the inorganic binder, and the phosphor powder at the ratios described in Table 1. Wherein, in the table, the content of the phosphor powder accounts for the content of the mixed powder, and the thermally conductive filler and the inorganic binder account for the rest. As each material, the following compounds were used.
[0081] (a) Thermally conductive filler
[0082] MgO (thermal conductivity: about 42W / m·K, average particle size D 50 : 43μm or 8μm)
[0083] Al 2 o 3 (Thermal conductivity: about 20W / m K, average particle size D 50 : 9μm)
[0084] MgAl 2 o 4 (Thermal c...
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Abstract
Provided are a wavelength conversion member whereby a reduction in light emission intensity over time or melting of a constituent material can be suppressed in the case of irradiation by high-power excitation light, a method for manufacturing the wavelength conversion member, and a light-emitting device in which the wavelength conversion member is used. A wavelength conversion member (10) is characterized in that a phosphor powder (2) and a heat-conductive filler (3) are dispersed in an inorganic binder (1), the refractive index difference of the inorganic binder (1) and the heat-conductive filler (3) is 0.2 or less, and the volume ratio of the content of each of the inorganic binder (1) and the heat-conductive filler (3) is 40:60 to 5:95.
Description
technical field [0001] The present invention relates to a wavelength conversion member for converting the wavelength of light emitted by a light emitting diode (LED: Light Emitting Diode) or a laser diode (LD: Laser Diode) to another wavelength, a method for manufacturing the same, and a light emitting device using the wavelength conversion member . Background technique [0002] In recent years, as a next-generation light-emitting device to replace fluorescent lamps and incandescent lamps, attention has been paid to light-emitting devices using excitation light sources such as LEDs and LDs from the viewpoint of low power consumption, small size and light weight, and easy light adjustment. . As an example of such a next-generation light-emitting device, for example, Patent Document 1 discloses a light-emitting device in which an LED that emits blue light is provided with a wavelength conversion member that absorbs part of light from the LED and converts it into yellow light....
Claims
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IPC IPC(8): F21V9/32F21V9/45F21Y115/10
CPCF21V9/32F21V9/45F21Y2115/10F21Y2115/30C09K11/00C09K5/14C09K11/02C09K11/0883C09K11/646C09K11/7706
Inventor 古山忠仁
Owner NIPPON ELECTRIC GLASS CO LTD