Light-emitting device, and electronic device and inspection method using same

A light emitting device, comprising:

• a light source that emits a primary light having a light energy density exceeding 0.5 W/mm2;
• and
• a first phosphor that absorbs the primary light to convert the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light,
• wherein the first phosphor includes a compound serving as a host, the compound being a simple oxide including one kind of metal element or a composite oxide including a plurality of different kinds of the simple oxide as an end member,
• when an energy conversion value at a peak wavelength of the primary light is E1 electron volts and an energy conversion value at a fluorescence peak wavelength of the first wavelength-converted light is E2 electron volts, a bandgap energy of a crystal of the simple oxide is larger than a sum of the E1 electron volts and the E2 electron volts, and
• the first wavelength-converted light includes fluorescence based on an electron energy transition of a transition metal ion, and an activator included in the first phosphor is at least one selected from the group consisting of Cr3+, V2+, Mn4+, Fe5+, Ce3+, and Eu2+.