Electroluminescence devices
A highly efficient, low driving-voltage, phosphorescent material for electroluminescence devices has been developed by scientists in Asia.
Zhaomin Hou from RIKEN Advanced Science Institute, Japan and colleagues from Jilin University, China, have synthesised an iridium complex with highly efficient electroluminescence (EL) properties.
Organic light-emitting devices (OLEDs) use phosphorescent metal complexes as emitting materials as they can show much higher emission efficiency than that of the fluorescent counterparts. Unfortunately, high-performance phosphorescent OLEDs are usually fabricated by doping the emitters at a low concentration range. It is difficult to maintain a consistent control of the dopant concentration (less than 10 %) during the doping process, so the reproducibility of mass production is challenging.
Hou has demonstrated for the first time that phosphorescent metal complexes bearing a sterically demanding ancillary amidinate ligand can be used for the fabrication of OLEDs. Thus resulting in highly efficient, low driving-voltage phosphorescence, which can be used at a wide range of doping concentrations or even without requirement of doping the emitter into a host matrix.
It is thought that due to the excellent performance and the ease of synthesis of this amidinate-ligated phosphorescent iridium complex reported here; it should have future potential in practical applications such as flat-panel displays and organic lighting.
Original article: Yu Liu et. al.; "Amidinate-ligated iridium(III) bis(2-pyridyl)phenyl complex as an excellent phosphorescent material for electroluminescence devices"; Chem. Commun. 2009
Other news from the department science
Get the chemical industry in your inbox
From now on, don't miss a thing: Our newsletter for the chemical industry, analytics, lab technology and process engineering brings you up to date every Tuesday and Thursday. The latest industry news, product highlights and innovations - compact and easy to understand in your inbox. Researched by us so you don't have to.
Most read news
See the theme worlds for related content
Topic world Synthesis
Chemical synthesis is at the heart of modern chemistry and enables the targeted production of molecules with specific properties. By combining starting materials in defined reaction conditions, chemists can create a wide range of compounds, from simple molecules to complex active ingredients.
Topic world Synthesis
Chemical synthesis is at the heart of modern chemistry and enables the targeted production of molecules with specific properties. By combining starting materials in defined reaction conditions, chemists can create a wide range of compounds, from simple molecules to complex active ingredients.
