Ngk Spark Plug Company, Limited

Yuki Shimura

Takeshi Mitsuoka

Yusuke Katsu

Tsuneyuki Ito

Jun Moteki

Shohei Takaku

Shinji Ban

Syohei Takaku

An optical wavelength converter () is configured such that an optical wavelength conversion member () is bonded to a heat dissipation member () having superior heat dissipation property. Thus, heat generated by light incident on the optical wavelength conversion member () can be efficiently dissipated. Therefore, even when high-energy light is incident on the optical wavelength converter, temperature quenching is less likely to occur, and thus high fluorescence intensity can be maintained. An intermediate film () is disposed between a reflective film () and a bonding portion (). The presence of the intermediate film () improves the adhesion between the reflective film () and the bonding portion (), thereby enhancing the heat dissipation from the optical wavelength conversion member () to the heat dissipation member (). Thus, the temperature quenching of the optical wavelength conversion member () can be prevented, thereby enhancing fluorescence intensity.

Optical wavelength converter and composite optical device

An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The optical wavelength conversion member () is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula ABO:Ce, where the element A is selected from Sc, Y, and lanthanoids (except for Ce), and the element B is selected from Al and Ga. In the optical wavelength conversion member (), 0.3&#x3c;a&#x3c;34 and 300 &#x3bc;m&#x3c;y&#x3c;1,050 &#x3bc;m are satisfied, wherein a represents the area ratio of the translucent phase to the fluorescent phase in a cross section of the optical wavelength conversion member (), and y represents the interfacial length of the fluorescent phase.

Optical wavelength conversion member and light-emitting device

Growing community of inventors

Nagoya, Japan

Yuki Shimura