Molecularly Controlled Interfacial Layer Strategy Toward Highly Efficient Simple‐Structured Organic Light‐Emitting Diodes

Abstract

A highly efficient simplified organic light-emitting diode (OLED) with a molecularly controlled strategy to form near-perfect interfacial layer on top of the anode is demonstrated. A self-organized polymeric hole injection layer (HIL) is exploited increasing hole injection, electron blocking, and reducing exciton quenching near the electrode or conducting polymers; this HIL allows simplified OLED comprised a single small-molecule fluorescent layer to exhibits a high current efficiency (∼20 cd/A).

Solvent-treated PEDOT:PSS on the improvement PTB7 based on polymer solar cells performance

“…[28,29] The tendency of V peak of both devices obtained in Fig.3 perfectly matches the V oc measured from J -V characteristics.…”

Universal high work function flexible anode for simplified ITO-free organic and perovskite light-emitting diodes with ultra-high efficiency

“…39 In addition, the surface-enriched insulating PFSA blocks electrons from cathodes and suppresses exciton quenching at the anode and MAPbBr 3 interface. 40,41 The MAPbBr 3 film on top of PEDOT:PSS (high conductivity), which directly contacted with the overlying MAPbBr 3 layer without the insulating PFSA, showed very short photoluminescence lifetime, and the photoluminescence lifetime was dramatically increased as the PFSA in AnoHIL increased (Supplementary Table S6 and Supplementary Figure S5). The variation of polymeric anodes did not influence the crystal structures of the overlying MAPbBr layer (Supplementary Figure S6).…”

Effects of thermal treatment on organic-inorganic hybrid perovskite films and luminous efficiency of light-emitting diodes

“…We chose CH 3 NH 3 PbBr 3 as an emitting layer (EML) because it has higher exciton binding energy (76 ~150 meV), shorter exciton diffusion length (~100 nm) at room temperature (RT) and more stable cubic phase [14,22] than do other perovskite materials (e.g., 2 ~ 50 meV, ~50 nm and distorted cubic phase for exciton binding energy, exciton diffusion length and crystal structure respectively of CH 3 NH 3 PbI 3 at RT) [23][24]. We used the self-organized buffer hole injection layer (Buf-HIL) composed of poly (3,4-ethylenedioxythiphene):poly(styrene sulfonate) (PEDOT:PSS) and perfluorinated polymeric acid, tetrafluoroethylene-perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid copolymer (PFI) to facilitate the hole injection to the OIP EML and prevent the exciton quenching at the interface [14,25,26]. rpm for 90 s. The CH 3 NH 3 PbBr 3 layer has both scattered large particles (> 1µm) and thin uniform film (~100 nm).…”