US 12,284,859 B2
Organic light-emitting device and apparatus including the same
Seungjin Chu, Yongin-si (KR); Kyungsik Kim, Yongin-si (KR); Sungwook Kim, Yongin-si (KR); Seulong Kim, Yongin-si (KR); Tsuyoshi Naijo, Yongin-si (KR); Yunjee Park, Yongin-si (KR); Sungsoo Bae, Yongin-si (KR); Dongchan Lee, Yongin-si (KR); Hyewon Choi, Yongin-si (KR); and Jaeweon Hur, Yongin-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed on Mar. 6, 2023, as Appl. No. 18/179,306.
Application 18/179,306 is a continuation of application No. 16/996,599, filed on Aug. 18, 2020, granted, now 11,626,566.
Claims priority of application No. 10-2019-0168146 (KR), filed on Dec. 16, 2019.
Prior Publication US 2023/0225144 A1, Jul. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H10K 50/12 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01)
CPC H10K 50/12 (2023.02) [H10K 85/324 (2023.02); H10K 85/615 (2023.02); H10K 85/654 (2023.02); H10K 85/6572 (2023.02); H10K 85/6574 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02)] 20 Claims
OG exemplary drawing
 
1. An organic light-emitting device comprising:
a first electrode;
a second electrode facing the first electrode;
an emission layer between the first electrode and the second electrode;
a mixed layer between the first electrode and the emission layer; and
a buffer layer between the emission layer and the second electrode,
wherein the mixed layer comprises a first compound and a second compound,
the first compound and the second compound are different from each other,
the emission layer comprises a host and a dopant,
the host comprises the second compound, and
the organic light-emitting device satisfies at least one of Equation 1, Equation 2, or Equation 3:
Equation 1
T1(D)≥T1(Mix)+0.3 eV  1
Equation 2
T1(H)≥T1(Mix)+0.3 eV  2
Equation 3
T1(Mix)<T1(Buffer)+0.5 eV  3
wherein, in Equation 1 to Equation 3,
T1(D) is a triplet energy level (eV) of the dopant,
T1(H) is i) a triplet energy level (eV) of the second compound, if the host consists of the second compound, or ii) a highest triplet energy level (eV) among triplet energy levels (eV) of one or more additional compounds in the host, if the host further comprises the one or more additional compound other than the second compound,
T1(Mix) is a highest triplet energy level (eV) among triplet energy levels (eV) of one or more compounds in the mixed layer,
T1(Buffer) is i) a triplet energy level (eV) of a compound in the buffer layer, if the buffer layer consists of the compound, or ii) a highest triplet energy level (eV) among triplet energy levels (eV) of a plurality of compounds in the buffer layer, if the buffer layer comprises at least two compounds which are different from each other, and
T1(D), T1(H), T1(Mix), and T1(Buffer) are each evaluated utilizing a density functional method (DFT).