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RESEARCH PRODUCT
Near-Quantitative Internal Quantum Efficiency in a Light-Emitting Electrochemical Cell
Enrique OrtíHenk J. BolinkRubén D. CostaNora LardiésEugenio Coronadosubject
PhotoluminescenceChemistrybusiness.industrychemistry.chemical_elementQuantum yieldElectroluminescenceElectrochemical cellInorganic ChemistryOptoelectronicsQuantum efficiencyIridiumLight-emitting electrochemical cellPhysical and Theoretical ChemistrybusinessElectrical efficiencydescription
A green-light-emitting iridium(III) complex was prepared that has a photoluminescence quantum yield in a thin-film configuration of almost unity. When used in a simple solid-state single-layer light-emitting electrochemical cell, it yielded an external quantum efficiency of nearly 15% and a power efficiency of 38 Lm/W. We argue that these high external efficiencies are only possible if near-quantitative internal electron-to-photon conversion occurs. This shows that the limiting factor for the efficiency of these devices is the photoluminescence quantum yield in a solid film configuration. The observed efficiencies show the prospect of these simple electroluminescent devices for lighting and signage applications.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-09-24 | Inorganic Chemistry |