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US 2021/0202876 A1Published application
Organic light emitting device and display device using the same
AssigneeLG Display Co., Ltd.
InventorsGyeong-Woo KIM, Hong-Seok CHOI, Seung-Ryong JOUNG, Jun-Ho LEE, Yoon-Deok HAN, Hee-Su BYEON
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Abstract
Discussed is an organic light emitting device in which a light emitting layer includes a host and different kinds of dopants, the fluorescent dopant is formed of a material having energy level properties facilitating thermally activated delayed fluorescence (TADF), and thus energy is concentratedly transferred to the fluorescent dopant so as to increase luminous efficacy of a single color.
Claims21
An organic light emitting device comprising:
- a light emitting layer provided between a first electrode and a second electrode arranged opposite each other,
- wherein the light emitting layer comprises:
- at least one host;
- a phosphorescent dopant configured to have a first triplet energy level;
- and
- a fluorescent dopant configured to have a second triplet energy level lower than the first triplet energy level and to generate thermally activated delayed fluorescence (TADF).
3 more elements
A display device comprising:
- a substrate comprising a plurality of subpixels;
- a thin film transistor provided in each of the subpixels;
- and
- an organic light emitting device provided in each of the 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, and
- wherein a light emitting layer of at least one of the stacks comprises:
- at least one host;
- a phosphorescent dopant configured to have a first triplet energy level;
- and
- a fluorescent dopant configured to have a second triplet energy level lower than the first triplet energy level and to generate thermally activated delayed fluorescence (TADF).
7 more elements
Dependencies are inferred from the claim text.