wavelength conversion device
A wavelength conversion device and wavelength conversion technology, applied in projection devices, lighting devices, components of lighting devices, etc., can solve problems such as inability to obtain heat dissipation effects, reduced conversion efficiency of wavelength conversion components, and inability to obtain light output, etc.
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no. 1 approach ＞
[0025] figure 1 The wavelength conversion device 100 of this embodiment is shown. The wavelength conversion device 100 includes a heat sink 50 , a wavelength conversion member 10 provided on the heat sink 50 , and a connecting member 40 made of a metal material and connecting the heat sink 50 and the wavelength conversion member 10 . In particular, the wavelength conversion member 10 has an upper surface, side surfaces and a lower surface, and the connection member 40 is thermally connected to the side surfaces and the lower surface of the wavelength conversion member 10 .
[0026] Thereby, deterioration of the wavelength conversion member 10 can be suppressed. This is because the connection member 40 is thermally connected not only to the bottom surface but also to the side surface, so that heat dissipation paths can be increased.
[0027] Here, in this specification, for convenience of description, the lower side of the illustrated cross-sectional view is expressed as "lo...
no. 2 approach ＞
[0068] As a mode different from the wavelength conversion device 100, it is also possible to adopt image 3 The configuration of the wavelength conversion device 200 shown is the same. The wavelength conversion device 200 has a third reflective film 23 made of a dielectric multilayer film between the first reflective film 21 and the second reflective film 22 described in the first embodiment. The third reflective film 23 can mainly reflect light incident in a vertical direction with respect to the first reflective film 21 . In this configuration, although the reflectance is improved by the dielectric multilayer film, the heat dissipation is reduced. However, in the present invention, since the connection member is provided not only on the lower surface but also on the side surface, a certain effect can be expected.
[0069] As the dielectric multilayer film, two or more layers having different refractive indices among the materials of the dielectric film in which the first r...
Embodiment 1
[0071] based on figure 1 The wavelength conversion device of this embodiment will be described. First, a wafer-shaped wavelength conversion member obtained by sintering a support made of powdery LAG-based phosphor and powdery alumina by the SPS method was prepared. On the upper surface of the wafer-shaped wavelength conversion member, a protective film made of silicon oxide (film thickness 100 nm) is formed by sputtering, and a protective film made of silicon oxide (film thickness 100 nm) is formed by sputtering in order from the wavelength conversion member side on the lower surface of the wavelength conversion member. The first reflective film made of aluminum (film thickness 1000 nm), and the second reflective film made of silver (film thickness 1000 nm).
[0072] Next, using a bevel dicing blade, dicing was performed so that the side surface of the wavelength conversion member spread from the bottom to the top. At this time, the inclination angle (the angle formed by th...
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