Lg Display Co., Ltd.

Sung-Jae Ko

Sung-Hoon Pieh

Ki-Woog Song

Hwa-Kyung Kim

Jae-II Song

Disclosed white organic light emitting device includes an anode and a cathode opposing each other; a charge generation layer interposed between the anode and the cathode; a first stack interposed between the anode and the charge generation layer, the first stack including a first hole transport layer and a first light emitting layer emitting blue fluorescent light; and a second stack interposed between the charge generation layer and the cathode, the second stack including a second hole transport layer and a second light emitting layer formed by doping one host with at least one of phosphorescent dopant, wherein a triplet energy level of the first hole transport layer is higher than a triplet energy level of the first light emitting layer, and a hole mobility of the first hole transport layer is 5.0&#xd7;10cm/s&#xb7;V to 9.9&#xd7;10cm/s&#xb7;V.

White organic light emitting device

A white organic light emitting device, with improved color shift characteristics and improved efficiency according to viewing angle changes by controlling conditions for designing an optical path in organic material layers between a cathode and an anode or adjusting interior or exterior thicknesses of the organic material layers, has a structure including a first electrode and layers between the first electrode and a second electrode satisfies an optical path condition represented by the following equation with respect to emissions of the first and second stacks, where &#x3bb; is an emission peak wavelength of the first stack or the second stack, nand dare a refractive index and a thickness of a transparent electrode selected from the first and second electrode, and nand dare a refractive index and a thickness of any one of the layers disposed between the first electrode and the second electrode, respectively.

Growing community of inventors

Chungcheongnam-do, South Korea

Sung-Jae Ko