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Harvesting Singlet and Triplet Energy in Polymer LEDs
Author(s) -
Cleave Vicki,
Yahioglu Goghan,
Barny Pierre Le,
Friend Richard H.,
Tessler Nir
Publication year - 1999
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/(sici)1521-4095(199903)11:4<285::aid-adma285>3.0.co;2-n
Subject(s) - light emitting diode , materials science , singlet state , optoelectronics , common emitter , dopant , light emission , excited state , semiconductor , oled , diode , excitation , electroluminescence , phosphorescence , atomic physics , doping , optics , nanotechnology , fluorescence , physics , layer (electronics) , quantum mechanics
That it is possible to surpass the 25 % limit set by spin statistics and achieve very efficient molecular light‐emitting diodes (LEDs) is demonstrated by the experimental results presented here. It is shown that energy can be captured from both singlet and triplet excited states and transformed into emitted light. Studies of LEDs in which platinum octaethylporphyrin (PtOEP), an efficient triplet emitter, is used as a “dopant” in a semiconductor polymer host are described. Time‐resolved measurements of light emission are used to determine the mechanism of excitation of PtOEP.