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 second electrode facing the first electrode;
an emission layer between the first electrode and the second electrode;
a hole control layer between the first electrode and the emission layer;
an electron control layer between the emission layer and the second electrode; and
a capping layer on the second electrode,
wherein the emission layer includes:
a first sub-emission layer including a first light-emitting dopant;
a second sub-emission layer including a second light-emitting dopant; and
a third sub-emission layer including a third light-emitting dopant;
the first to third sub-emission layers do not overlap one another in a thickness direction,
at least one of the first sub-emission layer and the second sub-emission layer includes a mixed hole-transporting host and an electron-transporting host which form an exciplex.
2. The organic light-emitting device as claimed in claim 1 ,
wherein the first to third sub-emission layers are spaced apart from one another in a plane.
3. The organic light-emitting device as claimed in claim 1 ,
wherein a triplet energy of the exciplex is equal to or greater than respective triplet energies of the first light-emitting dopant and the second light-emitting dopant.
4. The organic light-emitting device as claimed in claim 1 , wherein a triplet energy of the exciplex is about 2.5 eV to about 2.8 eV.
5. The organic light-emitting device as claimed in claim 1 ,
wherein the first light-emitting dopant is a red light-emitting dopant, the second light-emitting dopant is a green light-emitting dopant, and the third light-emitting dopant is a blue light-emitting dopant.
6. The organic light-emitting device as claimed in claim 5 , wherein the first light-emitting dopant and the second light-emitting dopant emit phosphorescent light, and the third light-emitting dopant emits fluorescence light.
7. The organic light-emitting device as claimed in claim 1 ,
wherein the capping layer includes at least one of an amine compound, a carbazole compound, or a naphthalene compound.
8. The organic light-emitting device as claimed in claim 1 ,
wherein the electron-transporting host is an organometallic complex, a spirofluorene-based compound, an oxidazole-based compound, a phenanthroline-based compound, a triazine-based compound, or a triazole-based compound.
9. The organic light-emitting device as claimed in claim 1 ,
wherein the electron control layer includes:
an electron transport layer; and
an electron injection layer on the electron transport layer, and
wherein the electron injection layer includes LiF, LiQ, Li 2 O, BaO, NaCl, Yb, CsF, RbCl, or RbI.
10. The organic light-emitting device as claimed in claim 1 ,
wherein the hole control layer includes:
a hole injection layer; and
a hole transport layer on the hole injection layer,
wherein the hole injection layer includes p-type dopant, and
wherein the p-type dopant is one selected from a quinone derivative, a metal oxide, and a cyano group-containing compound.
11. The organic light-emitting device as claimed in claim 1 ,
wherein the first electrode comprises at least one selected from Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, In, Sn, Zn, a compound of two or more thereof, a mixture of two or more thereof, and oxides thereof.
12. The organic light-emitting device as claimed in claim 1 , wherein the second electrode comprises at least one selected from Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/AI, Mo, Ti, In, Sn, Zn, a compound of two or more thereof, a mixture of two or more thereof, and oxides thereof.