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Triplet Formation In Polyfluorene Devices
Author(s) -
Dhoot A.S.,
Greenham N.C.
Publication year - 2002
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200290013
Subject(s) - polyfluorene , exciton , materials science , singlet state , optoelectronics , polymer , absorption (acoustics) , photoluminescence , copolymer , diode , photochemistry , condensed matter physics , atomic physics , physics , chemistry , composite material , excited state
The fraction of excitons formed as singlets governs the efficiency of a polymer light‐emitting diode (LED) (see Figure). By measuring absorptions due to triplet excitons in working poly(9,9‐dioctylfluorene) devices, the singlet formation probability is calculated. A lower limit of 58 % is found, significantly larger than that predicted statistically. In devices based on the copolymer F8BT, no triplet exciton absorption can be detected.