LIGHT-EMITTING DEVICE USING NONSTOICHIOMETRIC TETRAGONAL-SYSTEM ALKALI EARTH SILICATE PHOSPHOR

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting device capable of preventing or relaxing the reduction of a luminous intensity due to a temperature rise.

SOLUTION: The light-emitting device has a light-emitting diode and a nonstoichiometric luminous substance being arranged around the light-emitting diode, absorbing at least a part of a light emitted from the light-emitting diode and emitting the light having a wavelength different from the absorbed light. The nonstoichiometric luminous substance has a tetragonal-system crystal structure, and consists of a silicate phosphor having silicon larger than the silicon phosphor having a stoichiometric crystal structure in a crystal lattice.

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