Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes.
Solution-processed polymer organic light-emitting diodes (OLEDs) doped with triplet-triplet annihilation (TTA)-upconversion molecules, including 9,10-diphenylanthracene, perylene, rubrene and TIPS-pentacene, are reported. The fraction of triplet-generated electroluminescence approaches the theoretical limit. Record-high efficiencies in solution-processed OLEDs based on these materials are achieved. Unprecedented solid-state TTA-upconversion quantum yield of 23% (TTA-upconversion reaction efficiency of 70%) at electrical excitation well below one-sun equivalent is observed.
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Dawei
D
Di
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Le
L
Yang
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Johannes M
JM
Richter
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Lorenzo
L
Meraldi
King Abudulaziz City for Science and Technology, Riyadh, 12371, Saudi Arabia.
Rashid M
RM
Altamimi
King Abudulaziz City for Science and Technology, Riyadh, 12371, Saudi Arabia.
Ahmed Y
AY
Alyamani
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Dan
D
Credgington
Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
Kevin P
KP
Musselman
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.
Judith L
JL
MacManus-Driscoll
Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
Richard H
RH
Friend
molecularly doped polymer OLEDs; singlet exciton fission; solid-state TTA upconversion; solution-processing; triplet exciton fusion