Disclosed are a red light-emitting nitride material, a light-emitting part and a light-emitting device comprising the same. The colorant may be fixed to the surface of the modifying agent, optionally with a surface treatment. Attachments may be coupled to a receptacle located in the retainer, wherein the attachment is inserted into a receptacle and rotated in a first direction to couple the attachment to the retainer, and wherein the attachment is rotated in a second direction and removed from the receptacle to uncouple the attachment from the retainer.