Abstract:
PROBLEM TO BE SOLVED: To provide a light emitting diode to which a plurality of light emitting cells are electrically connected on a substrate.SOLUTION: A light emitting element 300 includes: a substrate; a plurality of light emitting cells 100 and 200; and at least four electrodes formed on the substrate. A plurality of light emitting cells constitutes a first light emitting cell block and a second light emitting cell block. A first electrode 310 in four electrodes is connected to among an anode of a first light emitting cell in the second light emitting cell block, a cathode of a fourth light emitting cell, and an AC power supply. A second electrode 320 is connected to among the anode of a second light emitting cell in the second light emitting cell block, the cathode of a third light emitting cell, and the AC power supply. A third electrode 330 is connected to among the cathode of first light emitting cell, the cathode of second light emitting cell, and an external circuit connected to one end of the anode side in the first light emitting cell block. A fourth electrode 340 is connected to the anode in first light emitting cell block.
Abstract:
PROBLEM TO BE SOLVED: To provide a technology for manufacturing a nitride-system light-emitting diode that has an active layer having a good-quality quantum well structure by using a large-area nitride semiconductor substrate whose principal surface has an off angle of 1-10 degrees in terms of an absolute value to an m-plane.SOLUTION: A method of manufacturing a nitride-system light-emitting diode includes a first step of growing an active layer having a quantum well structure containing In on a growth principal surface of a nitride semiconductor substrate having the growth principal surface. The growth principal surface is a plane having an off angle of 1-10 degrees in terms of an absolute value to an m-plane. A growth temperature of the nitride semiconductor layer to be grown on the nitride semiconductor substrate is set to 950°C or less prior to the first step.
Abstract:
PROBLEM TO BE SOLVED: To provide a high-efficiency light-emitting diode.SOLUTION: A light-emitting diode includes: a semiconductor laminate structure 30 including a p-type compound semiconductor layer 29, an active layer 27, and an n-type compound semiconductor layer 25; a first electrode located above the semiconductor laminate structure 30; and a graphene-meta material laminate structure 50 at least partially located between the first electrode and the semiconductor laminate structure 30. The adoption of the meta material can prevent light loss due to the first electrode and can increase the light efficiency of the light-emitting diode.
Abstract:
PROBLEM TO BE SOLVED: To provide an epitaxial wafer having a relatively large cavity between a growth substrate and an epitaxial layer so that a chemical lift-off or stress lift-off technique can be applied thereto, and to provide a method for producing the same.SOLUTION: An epitaxial wafer includes a substrate, a mask pattern positioned on the substrate and having a masking area and an opening part area, and an epitaxial layer for covering the mask pattern. The epitaxial layer includes a cavity positioned on the masking area. Since the epitaxial layer includes the cavity positioned on the masking area, the epitaxial layer can be separated easily from a growth substrate by applying a chemical lift-off or stress lift-off technique thereto by using the cavity.