Blue organic light emitting device
View Patent ↗A blue organic light emitting device is provided. The blue organic light emitting device comprises a first electrode; a second electrode; and an organic layer including an electron transport layer between the first electrode and the second electrode, wherein the electron transport layer includes a material having an energy gap of 2.8 eV or more between a highest occupied molecular orbital (HOMO) and a lowest unoccupied molecular orbital (LUMO).
1. A blue organic light emitting device comprising:
a substrate;
a first electrode disposed on the substrate;
a hole transport layer disposed on the first electrode;
a blue light emitting layer disposed on the hole transport layer;
an electron transport layer disposed on the blue light emitting layer;
a second electrode disposed on the electron transport layer,
the electron transport layer comprising a material with an energy gap of 2.8 eV or more between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO); and
a p-dopant material having a LUMO energy level lower than 5 eV and a HOMO energy level lower than 7 eV, wherein the p-dopant material is disposed between the first electrode and the blue light emitting layer.
2. The blue organic light emitting device of claim 1 , wherein the material with an energy gap of 2.8 eV or more between the HOMO and LUMO is selected from the group consisting of anthracene, a compound containing an anthracene unit, naphthalene, a compound containing a naphthalene unit, styrene, a compound containing a styrene unit, a silicon-containing compound, triphenylene, a compound containing a triphenylene unit, pyrene, a compound containing a pyrene unit, and combinations thereof.
3. The blue organic light emitting device of claim 1 , wherein the electron transport layer comprises an electron transporting material and an electron injection material.
4. The blue organic light emitting device of claim 3 , wherein the electron injection material is selected from the group consisting of LiQ, LiF, NaCl, CsF, Li 2 O, BaO, and combinations thereof.
5. The blue organic light emitting device of claim 1 , further comprising an intermediate layer between the first electrode and the blue light emitting layer, wherein the intermediate layer comprises the p-dopant material having a LUMO energy level lower than 5 eV and a HOMO energy level lower than 7 eV.
6. The blue organic light emitting device of claim 5 , wherein the intermediate layer comprises a hole transport layer.