Abstract: A light-emitting device includes a substrate including electrodes, a first group including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a second group including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a fluorescent layer disposed to receive light from the first group of blue light-emitting diode elements, and a phosphorescent layer disposed to receive light from the second group of blue light-emitting diode elements.

Abstract: A light-emitting device (10) includes a plurality of light-emitting areas (10a, 10b and 10c), and each of the light-emitting areas (10a, 10b and 10c) includes a first light-emitting block (3) and a second light-emitting block (4). Each respective first light-emitting blocks (3) include a plurality of first light-emitting elements (A1, A2, or A3), which are connected in series, and each respective second light-emitting blocks (4) include a plurality of second light-emitting elements (B1, B2, or B3), which are connected in series. The number of first light-emitting elements in each respective first light-emitting blocks (3) is the same with one another of the first light-emitting blocks (3), and the number of second light-emitting elements in each respective second light-emitting blocks (4) is the same with one another of the second light-emitting blocks (4).

Abstract: A light-emitting device (10) includes a plurality of light-emitting areas (10a, 10b and 10c), and each of the light-emitting areas (10a, 10b and 10c) includes a first light-emitting block (3) and a second light-emitting block (4). Each respective first light-emitting blocks (3) include a plurality of first light-emitting elements (A1, A2, or A3), which are connected in series, and each respective second light-emitting blocks (4) include a plurality of second light-emitting elements (B1, B2, or B3), which are connected in series. The number of first light-emitting elements in each respective first light-emitting blocks (3) is the same with one another of the first light-emitting blocks (3), and the number of second light-emitting elements in each respective second light-emitting blocks (4) is the same with one another of the second light-emitting blocks (4).

Abstract: A light-emitting device (10) includes a substrate (2) including electrodes, a first group (3) including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a second group (4) including a plurality of blue light-emitting diode elements that are disposed on the substrate and electrically connected to the electrodes, a fluorescent layer (3) disposed to receive light from the first group of blue light-emitting diode elements, and a phosphorescent layer (4) disposed to receive light from the second group of blue light-emitting diode elements.

Abstract: A semiconductor laser element which is composed of a compound semiconductor consisting of GaAs or the like, a silicon laser mount which is disposed beneath the semiconductor laser element so as to position the element, and on which an electrode layer as an electrode for the semiconductor laser element is formed, a heat sink which is disposed beneath the laser mount so as to dissipate, through the laser mount, the heat generated by the semiconductor laser element are mutually secured through hot contact bonding. The laser mount has a concave portion on the side opposite to its main surface on which the semiconductor layer element is secured, and the concave portion contains a heat dissipating body which is integrated thereinto and is made of copper having higher thermal conductivity than silicon.