White organic light emitting device

A white organic light emitting device, comprising:

• a first emission part between a first electrode and a second electrode, the first emission part having a first emission layer;
• a second emission part on the first emission part, the second emission part having a second emission layer;
• and
• a third emission part on the second emission part, the third emission part having a third emission layer,
• wherein emission positions of the first, second, and third emission layers are adjusted to enhance emission efficiency and a color viewing angle, based on a spectrum change rate and a cavity peak of each of the first, second, and third emission layers,
• wherein the emission position of the first emission layer is within a range of 100 nm to 150 nm with respect to the first electrode,
• wherein the emission position of the second emission layer is within a range of 240 nm to 280 nm with respect to the first electrode,
• wherein the emission position of the third emission layer is within a range of 370 nm to 410 nm with respect to the first electrode, and
• wherein a peak wavelength of the third emission layer is within a range of 540 nm to 650 nm.

A white organic light emitting device, comprising:

• a first emission part between a first electrode and a second electrode, the first emission part having a first emission layer;
• a second emission part on the first emission part, the second emission part having a second emission layer;
• and
• a third emission part on the second emission part, the third emission part having a third emission layer,
• wherein emission positions of the first, second, and third emission layers are adjusted to enhance emission efficiency and a color viewing angle, based on a spectrum change rate and a cavity peak of each of the first, second, and third emission layers,
• wherein the emission position of the first emission layer is within a range of 100 nm to 150 nm with respect to the first electrode,
• wherein the emission position of the second emission layer is within a range of 240 nm to 280 nm with respect to the first electrode,
• wherein the emission position of the third emission layer is within a range of 370 nm to 410 nm with respect to the first electrode,
• wherein at least two emission layers of the first, second, and third emission layers respectively emit light having a same color and the at least two emission layers are adjacent to each other,
• wherein the at least two emission layers comprise the first emission layer and the second emission layer,
• a peak wavelength of the first emission layer is within a range of 440 nm to 480 nm, and
• a peak wavelength of the second emission layer is within a range of 440 nm to 480 nm.