Light emitting device and light emitting module having the same

A light emitting module, comprising:

• a circuit board;
• and
• a plurality of light emitting devices arranged on the circuit board,
• each of the light emitting devices, comprising:
• a first sub-unit configured to emit light of a first wavelength;
• a second sub-unit disposed under the first sub-unit and configured to emit light of a second wavelength longer than the first wavelength;
• and
• a third sub-unit disposed under the second sub-unit and configured to emit light of a third wavelength longer than the first wavelength,
• wherein:
• the first sub-unit, the second sub-unit, and the third sub-unit comprise a first LED stack, a second LED stack, and a third LED stack, respectively;
• the first sub-unit further comprises a first upper contact electrode and a first lower contact electrode electrically connected to an upper surface and a lower surface of the first LED stack, respectively, and an extraction element configured to increase a light extraction efficiency of the first wavelength;
• and
• the extraction element is disposed between the first LED stack and the first upper contact electrode and covers the upper surface and a side surface of the first LED stack.