Patent ID: 11944002
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 12:
13. The organic light-emitting device of claim 1, wherein
the first electrode is an anode,
the second electrode is a cathode,
the organic light-emitting device further comprises:
an mth light-emitting unit between the first electrode and the second electrode;
an (m−1)th light-emitting unit between the first electrode and the mth light-emitting unit; and
an (m−1)th charge generation layer between the mth light-emitting unit and the (m−1)th light-emitting unit,

the mth light-emitting unit comprises an mth emission layer,
the (m−1)th light-emitting unit comprises an (m−1)th emission layer,
the organic light-emitting device further comprises an (m−1)th hole transport region between the first electrode and the (m−1)th emission layer, the organic light-emitting device further comprises an (m−1)th electron transport region between the (m−1)th emission layer and the (m−1)th charge generation layer,
the organic light-emitting device further comprises an mth hole transport region between the (m−1)th charge generation layer and the mth emission layer,
the organic light-emitting device further comprises an mth electron transport region between the mth emission layer and the second electrode,
an electron transport material comprised in the mth electron transport region is different from the electron transport material comprised in the (m−1)th electron transport region,
the (m−1)th and mth hole transport regions each comprise a hole injection layer, a hole transport layer, an electron blocking layer, or any combination thereof, and
the (m−1)th and mth electron transport regions each comprise a hole blocking layer, an electron transport layer, an electron injection layer, a buffer layer, or any combination thereof.