Patent ID: 11956980
Assignee: LG DISPLAY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 13:
14. A display device comprising:
a substrate comprising a plurality of subpixels;
a thin film transistor provided in each of the plurality of subpixels; and
an organic light emitting device provided in each of the plurality of subpixels so as to be connected to the thin film transistor,
wherein the organic light emitting device comprises a first electrode and a second electrode arranged opposite each other, and a plurality of stacks provided between the first and second electrodes so as to be distinguished from each other by charge generation layers,
wherein the plurality of stacks comprise:
a first blue light emitting stack comprising at least one blue light emitting layer having at least one host, a blue phosphorescent dopant for a blue wavelength and a blue fluorescent dopant for the blue wavelength in a single layer; and
a long-wavelength light emitting stack arranged opposite to the first blue light emitting stack with the charge generation layers interposed therebetween so as to emit light of wavelengths longer than blue wavelengths,

wherein a light emission is concentrated upon the blue fluorescent dopant through energy transfers from the host and the blue phosphorescent dopant to the blue fluorescent dopant in the single layer,
wherein the blue phosphorescent dopant is configured to have a first triplet energy level; and
wherein the blue fluorescent dopant is configured to have a second triplet energy level lower than the first triplet energy level and to generate fluorescence and thermally activated delayed fluorescence (TADF).