Three stack hybrid white oled for enhanced efficiency and lifetime

A device comprising:

• a first electrode;
• a second electrode;
• and
• a hybrid emissive stack disposed between the first electrode and the second electrode, the stack comprising:
• a first emissive unit that comprises a first fluorescent blue organic emissive unit;
• a first charge generation layer that is disposed over the first emissive unit;
• a second emissive unit that comprises a second fluorescent blue organic emissive unit that is disposed over the first charge generation layer;
• a second charge generation layer that is disposed over the second emissive unit;
• a third emissive unit that comprises a third fluorescent blue organic emissive unit that is disposed over the second charge generation layer;
• a third charge generation layer that is disposed over the third emissive unit;
• and
• a fourth emissive unit that comprises a phosphorescent organic emissive unit that is disposed over the third charge generation layer.