Role of bathocuproine as hole‐blocking and electron‐transporting layer in organic light emitting devices

Abstract

In this paper we present our results concerning the role of 2,9‐Dimethyl‐4,7‐diphenyl‐1,10‐phenanthroline (bathocuproine, BCP) in OLED structures with emissive layer of Tris‐(8‐hydroxyquinoline) aluminum (Alq3). It is established that instead of the higher working voltage of devices with bathocuproine their current efficiency significantly increased. This higher efficiency indicates strong hole‐blocking nature of bathocuproine (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Lead-chelating hole-transport layers for efficient and stable perovskite minimodules

“…We chose BCP for the PCE optimization. BCP has been broadly used as an electron transport material in p-i-n structure perovskite solar cells (35), and its hole-blocking property has been reported often (36)(37)(38). Thus, its loading ratio in PTAA needed to be optimized for optimal hole collection.…”

Pyrene–Oxadiazoles for Organic Light-Emitting Diodes: Triplet to Singlet Energy Transfer and Role of Hole-Injection/Hole-Blocking Materials

“…This can be ascribed to the efficient injection of holes from the ITO anode to the hole transport layer α-NPD. − Furthermore, in device IV, with the use of BCP as a HBL, there is a further increase in the efficiencies. This increase in efficiencies may be due to the confining of redundant holes in the emitting layer which did not recombine with the electrons in the emitting zone . The device structure IV was used for the other two derivatives ( 4 and 6 ).…”

“…This increase in efficiencies may be due to the confining of redundant holes in the emitting layer which did not recombine with the electrons in the emitting zone. 57 The device structure IV was used for the other two derivatives (4 and 6). It is evident from a Device configuration I: ITO (120 nm)/α-NPD (30 nm)/5 (35 nm)/BCP (6 nm)/Alq 3 (35 nm)/LiF (1 nm)/Al (150 nm).…”

Organic Light Emitting Diodes Based on Novel Zn and Al Complexes

“…Many effective methods have been reported to reduce the hole mobility and improve the balance of holes and electrons in the emitting layer (Troadec et al, 2002;Mori et al, 2008;Kim et al, 2005). 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (bathocuproine, BCP) was used in OLED and organic photovoltaic cell because of its multiple role as hole blocking (Adamovich et al, 2003;Kim et al, 2008;Tomova et al, , 2010, exciton-blocking layer Tripathi et al, 2008;Mori & Kato, 2007;Wu et al, 2003), electron transporting and buffer layer , or in combination with NPB in (NPB/BCP) n (n-number of layers) as hole-trapping layer ( Shi et al, 2006). In this work we present our results concerning the role of bathocuproine as hole blocking layer in OLED structure: ITO/HTL/EML/HBL/ETL/M.…”