Related Experiment Video
Updated: May 19, 2026
05:51
Fabrication of White Light-emitting Electrochemical Cells with Stable Emission from Exciplexes
Published on: November 15, 2016
Luminescent ionic transition-metal complexes for light-emitting electrochemical cells
Rubén D Costa1, Enrique Ortí, Henk J Bolink
1Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático J. Beltrán 2, 46980 Paterna, Valencia, Spain.
Angewandte Chemie (International Ed. in English)
|August 14, 2012
Summary
Ionic transition-metal complexes (iTMCs) offer a promising alternative in solid-state lighting (SSL). Research highlights the preparation and properties of cyclometalated Ir(III) complexes for efficient light-emitting electrochemical cells (LECs).
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Solid-state lighting (SSL) technologies, including LEDs and OLEDs, are crucial for energy efficiency.
- Light-emitting electrochemical cells (LECs) have emerged as a competitive SSL alternative.
- LECs utilize luminescent polymers or ionic species, notably ionic transition-metal complexes (iTMCs).
Purpose of the Study:
- To detail the preparation of cyclometalated iridium(III) complexes for LEC applications.
- To discuss the electronic, photophysical, and photochemical properties of these iTMCs.
- To review the performance advancements in iTMC-based LECs.
Main Methods:
- Synthesis and characterization of cyclometalated iridium(III) complexes.
- Investigation of photophysical properties (emission, quantum yield).
- Evaluation of electrochemical properties and device performance in LECs.
Main Results:
- Cyclometalated Ir(III) complexes are effectively prepared and exhibit tunable electronic and photophysical properties.
- These iTMCs demonstrate significant potential for high-performance LECs.
- Progress in LECs includes improved turn-on times, stability, efficiency, and color control.
Conclusions:
- Ionic transition-metal complexes, particularly Ir(III) derivatives, are key materials for advanced LECs.
- The unique properties of these complexes enable efficient and stable solid-state lighting.
- Further development of iTMC-based LECs promises enhanced energy efficiency in lighting applications.
Related Concept Videos
01:14Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
01:23Photoluminescence: Fluorescence and Phosphorescence
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:28Electrochemical Cells
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...