Organic light-emitting device
An organic light-emitting device and display apparatus, the device including a first electrode; a second electrode facing the first electrode; an emission layer between the first and second electrode; a hole control layer between the first electrode and the emission layer; and an electron control layer between the emission layer and the second electrode, wherein the emission layer includes a plurality of sub-emission layers to emit light having different wavelengths, at least portions of the plurality of sub-emission layers do not overlap one another, the plurality of sub-emission layers include: a first sub-emission layer including a first color light-emitting dopant, and a second sub-emission layer including a second color light-emitting dopant, the first and second sub-emission layers each include a hole-transporting and electron-transporting host which form an exciplex, and a triplet energy of the exciplex is equal to or greater than triplet energies of the first and second color light-emitting dopant.
1. An organic light-emitting device, comprising:
a first electrode;
a hole control layer on the first electrode;
an emission layer on the hole control layer;
an electron control layer on the emission layer;
a second electrode on the electron control layer; and
a capping layer on the second electrode,
wherein the emission layer comprises a first sub-emission layer, a second sub-emission layer, and a third sub-emission layer,
the first sub-emission layer comprises a first hole-transporting host, a first electron-transporting host, and a red light-emitting dopant,
the second sub-emission layer comprises a second hole-transporting host, a second electron-transporting host, and a green light-emitting dopant,
the third sub-emission layer comprises a third hole-transporting host, a third electron-transporting host, and a blue light-emitting dopant,
the red light-emitting dopant and green light-emitting dopant emit phosphorescent light, and
the blue light-emitting dopant emits thermally activated delayed fluorescence (TADF) light.
2. The organic light-emitting device as claimed in claim 1 ,
wherein the first hole-transporting host and the first electron-transporting host form a first exciplex, and
a triplet energy of the first exciplex is equal to or greater than a triplet energy of the red light-emitting dopant.
3. The organic light-emitting device as claimed in claim 2 ,
wherein the triplet energy of the first exciplex is about 2.4 eV to about 3.0 eV.
4. The organic light-emitting device as claimed in claim 1 ,
wherein the second hole-transporting host and the second electron-transporting host form a second exciplex, and
a triplet energy of the second exciplex is equal to or greater than a triplet energy of the green light-emitting dopant.
5. The organic light-emitting device as claimed in claim 4 ,
wherein the triplet energy of the second exciplex is about 2.4 eV to about 3.0 eV.
6. The organic light-emitting device as claimed in claim 1 ,
wherein the third hole-transporting host and the third electron-transporting host form a third exciplex, and
a difference between a triplet energy level of the third exciplex and a singlet energy level of the blue light-emitting dopant is about −0.1 eV to about 0.1 eV.
7. The organic light-emitting device as claimed in claim 1 ,
wherein the electron control layer comprises:
an electron transport layer; and
an electron injection layer on the electron transport layer,
wherein the electron injection layer comprises LiF, LiQ, Li2O, BaO, NaCl, Yb, CsF, RbCl, or RbI.
8. The organic light-emitting device as claimed in claim 1 ,
wherein the hole control layer comprises:
a hole injection layer; and
a hole transport layer on the hole injection layer,
the hole injection layer comprises p-type dopant, and
the p-type dopant is one selected from a quinone derivative, a metal oxide, and a cyano group-containing compound.
9. The organic light-emitting device as claimed in claim 1 ,
wherein the capping layer comprises at least one of an amine compound, a carbazole compound, or a naphthalene compound.
10. The organic light-emitting device as claimed in claim 1 ,
wherein a difference between a lowest unoccupied molecular orbital (LUMO) energy level of the first hole-transporting host and a LUMO energy level of the first electron-transporting host is about 0.2 eV or more.
11. The organic light-emitting device as claimed in claim 1 ,
wherein a difference between a lowest unoccupied molecular orbital (LUMO) energy level of the second hole-transporting host and a LUMO energy level of the second electron-transporting host is about 0.2 eV or more.
12. An organic light-emitting display apparatus, comprising:
a timing controller;
a scan driver;
a source driver; and
an organic light-emitting display panel including an organic light-emitting device,
wherein the organic light-emitting device comprises:
a first electrode;
a hole control layer on the first electrode;
an emission layer on the hole control layer;
an electron control layer on the emission layer; and
a second electrode on the electron control layer,
the emission layer comprises a first sub-emission layer, a second sub-emission layer, and a third sub-emission layer,
the first sub-emission layer comprises a first hole-transporting host, a first electron-transporting host, and a red light-emitting dopant,
the second sub-emission layer comprises a second hole-transporting host, a second electron-transporting host, and a green light-emitting dopant,
the third sub-emission layer comprises a third hole-transporting host, a third electron-transporting host, and a blue light-emitting dopant,
the red light-emitting dopant and green light-emitting dopant emit phosphorescent light, and
the blue light-emitting dopant emits phosphorescent light and thermally activated delayed fluorescence (TADF) light.
13. The organic light-emitting display apparatus as claimed in claim 12 ,
wherein the first hole-transporting host and the first electron-transporting host form a first exciplex, and
a triplet energy of the first exciplex is equal to or greater than a triplet energy of the red light-emitting dopant.
14. The organic light-emitting display apparatus as claimed in claim 12 ,
wherein the second hole-transporting host and the second electron-transporting host form a second exciplex, and
a triplet energy of the second exciplex is equal to or greater than a triplet energy of the green light-emitting dopant.
15. The organic light-emitting display apparatus as claimed in claim 12 ,
wherein the third hole-transporting host and the third electron-transporting host form a third exciplex, and
a difference between a triplet energy level of the third exciplex and a singlet energy level of the blue light-emitting dopant is about −0.1 eV to about 0.1 eV.