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Enhanced Electroluminescence from Organic Light‐Emitting Diodes with an Organic–Inorganic Perovskite Host Layer
Author(s) -
Matsushima Toshinori,
Qin Chuanjiang,
Goushi Kenichi,
Bencheikh Fatima,
Komino Takeshi,
Leyden Matthew,
Sandanayaka Atula S. D.,
Adachi Chihaya
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802662
Subject(s) - oled , materials science , electroluminescence , optoelectronics , perovskite (structure) , diode , common emitter , layer (electronics) , fabrication , photoluminescence , quantum efficiency , band gap , nanotechnology , chemical engineering , medicine , alternative medicine , pathology , engineering
The development of host materials with high performance is essential for fabrication of efficient and stable organic light‐emitting diodes (OLEDs). Although host materials used in OLEDs are typically organics, in this study, it is shown that the organic–inorganic perovskite CH 3 NH 3 PbCl 3 (MAPbCl 3 ) can be used as a host layer for OLEDs. Vacuum‐evaporated MAPbCl 3 films have a wide band gap of about 3 eV and very high and relatively balanced hole and electron mobilities, which are suitable for the host material. Photoluminescence and electroluminescence take place through energy transfer from MAPbCl 3 to an organic emitter in films. Incorporation of an MAPbCl 3 host layer into OLEDs leads to a reduction of driving voltage and enhancement of external quantum efficiency as compared to devices with a conventional organic host layer. Additionally, OLEDs with an MAPbCl 3 host layer demonstrate very good operational stability under continuous current operation. These results can be extensively applied to organic‐ and perovskite‐based optoelectronics.