Bimolecular reactions of singlet excitons in tris(8‐hydroxyquinoline) aluminum

Autor:	Ardie D. Walser, Ching Wan Tang, I. Sokolik, Roger Dorsinville, Richard Priestley
Rok vydání:	1996
Předmět:	Condensed Matter::Materials Science Reaction rate constant Photoluminescence Physics and Astronomy (miscellaneous) Chemistry Exciton Diffusion Excited state Quantum efficiency Singlet state Electroluminescence Photochemistry
Zdroj:	Applied Physics Letters. 69:4168-4170
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.116974
Popis:	We have studied singlet excited state dynamics in thin films of tris(8‐hydroxyquinoline) aluminum (Alq3), a well known emitter for organic electroluminescent devices. Our experimental results show that bimolecular recombination dominates the singlet exciton decay in pristine films at high intensities, thus decreasing the photoluminescence quantum efficiency and the singlet lifetime. Because of the relatively low carrier concentration at which light emitting diodes operate the electroluminescence efficiency is not affected. The measured rate constant of singlet–singlet annihilation in Alq3 films is γss=(3.5±2.5)×10−11 cm3 s−1. The diffusion coefficient and the diffusion length of singlet excitons estimated from γss are Ds=(1.2±0.8)×10−5 cm2 s−1 and L=98±40 A, respectively.
Databáze:	OpenAIRE
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