Light-emitting device and display device having the same

A light-emitting device, comprising:

• a semiconductor stack generating a first light;
• and
• a filter formed on the semiconductor stack, comprising a first surface facing the semiconductor stack and a second surface opposite to the first surface, wherein the filter comprises a plurality of pairs of layers with different refractive indexes alternately stacked;
• wherein:
• a portion of the first light is transmitted by the filter;
• the light emitting device emits a second light comprising the portion of the first light;
• the first light has a first FWHM and the second light has a second FWHM;
• and
• the second FWHM is smaller than the first FWHM, and/or the second light has a FWHM less than or equal to 25 nm.

A light-emitting device, comprising:

• a semiconductor stack generating a first light;
• a filter formed on the semiconductor stack, comprising a first surface facing the semiconductor stack and a second surface opposite to the first surface;
• and
• a transparent conductive layer formed on the semiconductor stack;
• wherein:
• the filter comprises a first dielectric layer and a second dielectric layer alternately stacked;
• the first surface contacts the transparent conductive layer;
• a portion of the first light is transmitted by the filter;
• and
• the light-emitting device has a beam angle in a range of 50 degrees to 110 degrees.