Light-emitting device

A light-emitting device comprising:

• a plurality of first electrodes disposed according to a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, respectively;
• a second electrode facing the plurality of first electrodes;
• a hole transport region disposed between the first electrode and the second electrode and comprising a hole injection layer or a hole transport layer;
• a first layer disposed between the hole transport region and the second electrode and integrated with the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel;
• a fourth emission layer disposed between the hole transport region and the second electrode, in a region corresponding to the fourth sub-pixel, and emitting near-infrared (NIR) light having a maximum emission wavelength of about 850 nm or more;
• and
• a fourth auxiliary layer disposed between the hole transport region and the fourth emission layer.