Organic light emitting diode
AssigneeSamsung Display Co., Ltd.
InventorsJimyoung Ye, Hyomin Ko
Life of this patent
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Abstract
An organic light emitting diode includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The hole transport region includes a first hole transport layer which is directly disposed on the lower portion of the emission layer and has a first refractive index, and a second hole transport layer which is disposed on the lower portion of the first hole transport layer and has a second refractive index, thereby exhibiting an improved luminous efficiency characteristic.
Claims17
An organic light emitting diode comprising:
- a first electrode;
- a hole transport region disposed on the first electrode;
- an emission layer disposed on the hole transport region;
- an electron transport region disposed on the emission layer;
- and
- a second electrode disposed on the electron transport region,
- wherein the hole transport region comprises:
- a first hole transport layer having a first refractive index;
- and
- a second hole transport layer having a second refractive index greater than the first refractive index and being disposed under the first hole transport layer,
- wherein the first hole transport layer comprises a fluorene compound represented by Formula 1 below:
- wherein, in Formula 1 above,
- R1 and R2 are each independently a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
- n is an integer of 1 to 3, and
- Ar1 to Ar4 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 60 carbon atoms, or are bonded to an adjacent group to form a ring, and
- wherein R1 and R2 are each independently an unsubstituted n-butyl group or a n-pentyl group substituted with CF3, when n is 1.
An organic light emitting diode comprising:
- a first electrode;
- a hole transport region disposed on the first electrode;
- an emission layer disposed on the hole transport region;
- an electron transport region disposed on the emission layer;
- and
- a second electrode disposed on the electron transport region,
- wherein the hole transport region comprises a plurality of hole transport layers having different refractive indexes, and
- a layer, among the plurality of the hole transport layers, which is adjacent to the emission layer comprises a fluorene compound represented by Formula 1 below:
- wherein, in Formula 1 above,
- R1 and R2 are each independently a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms,
- n is an integer of 1 to 3, and
- Ar1 to Ar4 are each independently a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amino group, a substituted or unsubstituted aryl group having 6 to 60 carbon atoms, a substituted or unsubstituted heterocyclic group having 2 to 60 carbon atoms, or are bonded to an adjacent group to form a ring, and
- wherein R1 and R2 are each independently an unsubstituted n-butyl group or a n-pentyl group substituted with CF3, when n is 1.
Dependencies are inferred from the claim text.