A light emitting element suitable for a blue light lamp in a signal light apparatus is provided. The group III nitride compound semiconductor light emitting element includes a first light emitting layer for emitting a first light having a blue light and a second light emitting layer for emitting a second light having a green light. The first light and the second light are combined to provide a third light having a blue-green light synthesized from the first light and the second light.

 
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> Silicon nitride powder, silicon nitride sintered body, sintered silicon nitride substrate, and circuit board and thermoelectric module comprising such sintered silicon nitride substrate
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