Enhanced Electroluminescence from Organic Light‐Emitting Diodes with an Organic–Inorganic Perovskite Host Layer |
| |
| Authors: | Toshinori Matsushima Chuanjiang Qin Kenichi Goushi Fatima Bencheikh Takeshi Komino Matthew Leyden Atula S D Sandanayaka Chihaya Adachi |
| |
| Affiliation: | 1. Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Nishi, Fukuoka, Japan;2. Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, Nishi, Fukuoka, Japan;3. International Institute for Carbon Neutral Energy Research (WPI‐I2CNER), Kyushu University, Nishi, Fukuoka, Japan;4. Education Center for Global Leaders in Molecular System for Devices, Kyushu University, Nishi, Fukuoka, Japan |
| |
| Abstract: | 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 CH3NH3PbCl3 (MAPbCl3) can be used as a host layer for OLEDs. Vacuum‐evaporated MAPbCl3 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 MAPbCl3 to an organic emitter in films. Incorporation of an MAPbCl3 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 MAPbCl3 host layer demonstrate very good operational stability under continuous current operation. These results can be extensively applied to organic‐ and perovskite‐based optoelectronics. |
| |
| Keywords: | energy transfer organic fluorescent molecules organic light‐emitting diodes organic– inorganic perovskite hosts singlet exciton generation |
|
|
