Light Emitting Device and Luminaire

A luminaire comprising:

• a luminaire member;
• and
• a light-emitting device provided on the luminaire member, wherein
• the light-emitting device includes:
• a light-emitting section including:
• a mounting substrate section including:
• an insulative substrate including a first principal plane including a mounting region and a second principal plane on an opposite side of the first principal plane;
• a first metal layer provided on the first principal plane and including a plurality of mounting patterns provided in the mounting region;
• and
• a second metal layer provided on the second principal plane and electrically insulated from the first metal layer, at least a part of the second metal layer overlapping the mounting region when projected on a first plane parallel to the first principal plane;
• a light-emitting element section including:
• a plurality of semiconductor light-emitting elements provided on the first principal plane, each of the plurality of semiconductor light-emitting elements being electrically connected to any one mounting pattern among the plurality of mounting patterns and another one mounting pattern adjacent to the mounting pattern among the plurality of mounting patterns;
• and
• a wavelength conversion layer configured to cover at least parts of the plurality of semiconductor light-emitting elements, absorb at least a part of first light emitted from the plurality of semiconductor light-emitting elements, and emit second light having a wavelength different from a wavelength of the first light,
• luminous exitance of light emitted from the light-emitting element section being equal to or higher than 101 m/mm2 and equal to or lower than 1001 m/mm2;
• a thermal radiation member opposed to the second principal plane and having an area equal to or larger than five times an area of the mounting region when projected on the first plane;
• and
• a heat conduction layer provided between the thermal radiation member and the second metal layer, and
• heat conductivity of the thermal radiation member is larger than heat conductivity of the luminaire member and equal to or higher than 300 W/(m·K).

A light-emitting device comprising:

• a ceramic substrate including a first surface and a second surface located on an opposite side of the first surface and including a pair of first end sides and a pair of second end sides orthogonal to the first end sides and having length equal to or smaller than length of the first end sides;
• a first metal layer and a second metal layer formed on the first surface;
• a third metal layer formed on the second surface;
• a light-emitting section including a light-emitting element, one end of which is electrically connected to one end side of the first metal layer and the other end of which is electrically connected to one end side of the second metal layer;
• a first connector provided on the other end side of the first metal layer;
• a second connector provided on the other end side of the second metal layer;
• and
• a thermal radiation plate made of metal connected to the third metal layer to be opposed to the ceramic substrate via a solder layer, wherein
• when an axis passing a center of the ceramic substrate and extending along the first end side is represented as first axis and an axis passing the center of the ceramic substrate and extending along the second end side is represented as second axis, the light-emitting section is arranged such that a center of the light-emitting section substantially coincides with the center of the ceramic substrate, the center of the light-emitting section, the first connector, and the second connector are arranged on the first axis, and the first connector and the second connector are arranged to hold the light-emitting section therebetween.