Publication

Efficient orange light-emitting electrochemical cells

Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Etienne Baranoff, Nail Malikovich Shavaleev
2012
Journal Articles

Abstract

We report the first bis-cyclometalated cationic iridium(III) complex with N-aryl-substituted 1H-imidazo [4,5-f][1,10]phenanthroline. The complex emits yellow-orange phosphorescence with a maximum at 583 nm, a quantum yield of 43%, and an excited-state lifetime of 910 ns in argon-saturated dichloromethane. Optimized orange light-emitting electrochemical cells with the new Ir(III) complex exhibit fast turn-on, a peak luminance of 684 cd m(-2) and a peak efficacy of 6.5 cd A(-1); in 850 h of continuous operation their luminance and efficacy decrease only by 20%.

Official source

https://infoscience.epfl.ch/entities/publication/1fe823b6-1d99-49b6-b332-3264cae262ec

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Michael Graetzel, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Etienne Baranoff, Nail Malikovich Shavaleev
2012
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1fe823b6-1d99-49b6-b332-3264cae262ec

About this result

Related concepts (26)

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

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An organic light-emitting diode (OLED), also known as organic electroluminescent (organic EL) diode, is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This organic layer is situated between two electrodes; typically, at least one of these electrodes is transparent. OLEDs are used to create digital displays in devices such as television screens, computer monitors, and portable systems such as smartphones and handheld game consoles.

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Related publications (23)

Efficient orange light-emitting electrochemical cells

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