title: Organic/Organic Heterointerface Engineering to Boost Carrier Injection in OLEDs.
abstract: We investigate dynamic formation of nanosheet charge accumulations by heterointerface engineering in double injection layer (DIL) based organic light emitting diodes (OLEDs). Our experimental results show that the device performance is considerably improved for the DIL device as the result of heterointerface injection layer (HIIL) formation, in comparison to reference devices, namely, the current density is doubled and even quadrupled and the turn-on voltage is favorably halved, to 3.7 V, which is promising for simple small-molecule OLEDs. The simulation reveals the (i) formation of dynamic p-type doping (DPD) region which treats the quasi Fermi level at the organic/electrode interface, and (ii) formation of dynamic dipole layer (DDL) and the associated electric field at the organic/organic interface which accelerates the ejection of the carriers and their transference to the successive layer. HIIL formation proposes alternate scenarios for device design. For instance, no prerequisite for plasma treatment of transparent anode electrode, our freedom in varying the thicknesses of the organic layers between 10 nm and 60 nm for the first layer and between 6 nm and 24 nm for the second layer. The implications of the present work give insight into the dynamic phenomena in OLEDs and facilitates the development of their inexpensive fabrication for lighting applications.
authors.affiliation: Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Fathollahi
authors.affiliation: Department of Physics, Bu-Ali Sina University, P.O. Box 65174, Hamedan, Iran.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Ameri
authors.affiliation: Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Ezeddin
authors.initials: E
authors.lastname: Mohajerani
authors.affiliation: Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Ebrahim
authors.initials: E
authors.lastname: Mehrparvar
authors.affiliation: Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran 1983963113, Iran.
authors.forename: Mohammadrasoul
authors.initials: M
authors.lastname: Babaei
mesh_terms: D004867:Equipment Design; D008029:Lighting / Q000295:instrumentation*; D053768:Metal Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D009930:Organic Chemicals / Q000737:chemistry*; D012666:Semiconductors
chemical_list: D009930:Organic Chemicals