Organic electroluminescence device and luminescence apparatus
View Patent ↗The invention provides an organic EL device including a pair of electrodes and at least one luminescent layer located between the pair of electrodes, the luminescent layer including a blue phosphorescent material having a luminescence peak in a range of from 420 nm to less than 500 nm, a green phosphorescent material having a luminescence peak in a range of from 500 nm to less than 570 nm, a red phosphorescent material having a luminescence peak in a range of from 570 nm to 650 nm, and a charge-transporting material, the charge-transporting material having a lowest excited triplet energy level (T 1 ) of 2.7 eV or more, and the T 1 of the charge-transporting material being higher than the T 1 of the blue phosphorescent material by 0.08 eV or more.
1. An organic EL device comprising a pair of electrodes, and a first luminescent layer and a second luminescent layer adjacent to each other and located between the pair of electrodes,
the first luminescent layer comprising, in one layer, a blue phosphorescent material having a luminescence peak in a range of from 420 nm to less than 500 nm and a charge-transporting material having a lowest excited triplet energy level (T 1 ) of 2.7 eV or more, each of which is mixed within the entire first luminescent layer;
the second luminescent layer comprising, in one layer, a green phosphorescent material having a luminescence peak in a range of from 500 nm to less than 570 nm and a red phosphorescent material having a luminescence peak in a range of from 570 nm to 650 nm, each of which is mixed within the entire second luminescent layer; and
the T 1 of the charge-transporting material being higher than the T 1 of the blue phosphorescent material by 0.08 eV or more.
2. The organic EL device according to claim 1 , wherein the concentration of the green phosphorescent material and the concentration of the red phosphorescent material in the second luminescent layer are each 0.2% by mass or more, respectively.
3. The organic EL device according to claim 1 , wherein the concentration of the blue phosphorescent material in the first luminescent layer is 5% by mass or more.
4. The organic EL device according to claim 1 , wherein at least one of the blue phosphorescent material, the green phosphorescent material, or the red phosphorescent material is a platinum complex.
5. The organic EL device according to claim 1 , wherein the T 1 of the charge-transporting material is 2.8 eV or more.
6. The organic EL device according to claim 1 , wherein the T 1 of the charge-transporting material is higher than the T 1 of the blue phosphorescent material by 0.2 eV or more.
7. An organic EL device comprising a pair of electrodes, and a first luminescent layer and a second luminescent layer adjacent to each other and located between the pair of electrodes,
the first luminescent layer comprising, in one layer, a blue phosphorescent material having a luminescence peak in a range of from 420 nm to less than 500 nm, which is mixed within the entire first luminescent layer;
the second luminescent layer comprising, in one layer, a green phosphorescent material having a luminescence peak in a range of from 500 nm to less than 570 nm, a red phosphorescent material having a luminescence peak in a range of from 570 nm to 650 nm, and a charge-transporting material having a lowest excited triplet energy level (T 1 ) of 2.7 eV or more, each of which is mixed within the entire second luminescent layer; and
the T 1 of the charge-transporting material being higher than the T 1 of the blue phosphorescent material by 0.08 eV or more.
8. The organic EL device according to claim 7 , wherein the concentration of the green phosphorescent material and the concentration of the red phosphorescent material in the second luminescent layer are each 0.2% by mass or more, respectively.
9. The organic EL device according to claim 7 , wherein the concentration of the blue phosphorescent material in the first luminescent layer is 5% by mass or more.
10. The organic EL device according to claim 7 , wherein at least one of the blue phosphorescent material, the green phosphorescent material, or the red phosphorescent material is a platinum complex.
11. The organic EL device according to claim 7 , wherein the T 1 of the charge-transporting material is 2.8 eV or more.
12. The organic EL device according to claim 7 , wherein the T 1 of the charge-transporting material is higher than the T 1 of the blue phosphorescent material by 0.2 eV or more.