Display apparatus having a light-emitting layer

A display apparatus comprising:

• an anode;
• a cathode on the anode;
• a first charge generation layer between the anode and the cathode;
• a first emission stack between the anode and the first charge generation layer, the first emission stack including a blue emission material layer;
• and
• a second emission stack between the first charge generation layer and the cathode,
• wherein the second emission stack includes an emission buffer layer, a first phosphorescent emission material layer and a second phosphorescent emission material layer, which are sequentially stacked,
• wherein the emission buffer layer is disposed between the first charge generation layer and the first phosphorescent emission material layer,
• wherein the emission buffer layer includes a host having an electron transporting properties,
• wherein the emission buffer layer and the first phosphorescent emission material layer include a red dopant,
• wherein a content of the red dopant in the emission buffer layer decreases as a distance from the first charge generation layer increases such that a content of the red dopant in a portion of the emission buffer layer disposed close to the first charge generation layer is larger than a content of the red dopant in a portion of the emission buffer layer disposed close to the first phosphorescent emission material layer, and
• wherein the content of the red dopant in a portion of the emission buffer layer disposed close to the first charge generation layer is larger than a content of the red dopant in the first phosphorescent emission material layer.