Abstract: An embodiment optical connecting structure is an optical connecting structure in a package structure connected to an optical fiber and including a first electric wiring board and a second electric wiring board facing the first electric wiring board. The optical connecting structure includes an optical element arranged on either the first electric wiring board or the second electric wiring board and a GRIN lens arranged on a surface of the second electric wiring board facing the first electric wiring board, in which one end surface of the GRIN lens faces an end surface of the optical element.

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 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.