Patent ID: 11925047
Assignee: LG DISPLAY CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 15:
16. A light-emitting device comprising:
a first electrode;
a hole transport layer disposed on the first electrode;
a first emissive layer disposed on the hole transport layer;
a second emissive layer disposed directly on the first emissive layer; and
an electron transport layer disposed on the second emissive layer; and
a second electrode disposed on the electron transport layer, wherein
the first emissive layer comprises a first host and a first blue dopant,
the second emissive layer comprises a second host and a second blue dopant,
a triplet energy level of the first host is greater than a triplet energy level of the second host, and a triplet energy level of the first blue dopant is greater than the triplet energy level of the first host,
a singlet energy level of the first host is greater than a singlet energy level of the second host, and
the singlet energy level of the second host is greater than a singlet energy level of the first blue dopant.