Organic electroluminescent device comprising two-dimensional emissive layer
地域：
MI
MI Ann Arbor
摘要
An organic light emitting device comprises an anode and a cathode, at least one organic layer configured between the anode and the cathode, and at least one two-dimensional emissive layer configured between the anode and the cathode. A method of fabricating an organic light emitting device is also disclosed.
說明書
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where Isense is the measured intensity, FN(x) is the density of the excitons, ηoc(x) is the outcoupling efficiency, Φ(x) is the sensing layer PL quantum yield and Eph is the average photon energy from the sensing molecule. A 0.5 ? thick slab of Platinum Octaethylporphyrin (PtOEP) is used as the sensing layer due to the similarity of its energy levels with those of WS2. Since same amount of PtOEP was used for each slab sensing layer, Φ(x) and Eph are identical at all positions. Thus, FN(x) could be derived by measuring the external quantum efficiencies (EQE) and calculating ηoc(x). With reference to FIG. 6E , a slab of PtOEP 604 was placed in the emissive layer (EML) at different positions between the interface with the hole transport layer (HTL) 601 and the interface with the electron transport layer (ETL) 603 at 2.5 nm intervals. The exciton density profile in FIG. 6F shows that the excitons are formed at the EML-ETL interface and diffuse toward the HTL at higher current (exciton) densities. This leads to decreased EQE as the PtOEP slab moves further from the EML-ETL interface as shown in FIG. 6G . Also, as the PtOEP slab moves away from the EML-ETL interface, CBP emission rises because the generated excitons in the EML-ETL interface could not be efficiently collected via exciton diffusion due to the limited diffusion length. Thus, a device was fabricated having a sheet of monolayer WS2 at x=12 nm, to efficiently collect the generated excitons with a WS2 active layer.
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