Excitonic singlet-triplet ratios in molecular and polymeric organic materials

Abstract

A simple technique employing reverse bias measurements of photoluminescent efficiency is described to determine the excitonic singlet-triplet formation statistics of electroluminescent organic thin films. Using this method, the singlet fractions in thin films of two organic emissive materials commonly used in organic light emitting devices, tris(8-hydroxyquinoline) aluminum $({\mathrm{Alq}}_{3})$ and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV), are found to be $(20\ifmmode\pm\else\textpm\fi{}1)%$ and $(20\ifmmode\pm\else\textpm\fi{}4)%,$ respectively. Results are confirmed using a sensitive synchronous detection scheme. We discuss other measurements and the current understanding of exciton formation statistics in polymeric and small molecular weight organic electroluminescent materials.

Keywords

ElectroluminescenceSinglet statePhotoluminescenceMaterials scienceExcitonThin filmOrganic semiconductorOLEDPhosphorescent organic light-emitting diodeOptoelectronicsPhotochemistryAnalytical Chemistry (journal)Atomic physicsNanotechnologyChemistryPhysicsCondensed matter physicsOrganic chemistryExcited state

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Publication Info

Year: 2003
Type: article
Volume: 68
Issue: 7
Citations: 353
Access: Closed

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APA Style

                            
                                
                                    Michael Segal, 
                                
                                    Marc A. Baldo, 
                                
                                    Russell J. Holmes
                                
                                et al.
                            
                            (2003). 
                            Excitonic singlet-triplet ratios in molecular and polymeric organic materials. 
                            Physical review. B, Condensed matter
                            , 68
                            (7)
                            .
                            https://doi.org/10.1103/physrevb.68.075211
                        

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DOI: 10.1103/physrevb.68.075211

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Data completeness: 81%