Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes

Dawei Di; Le Yang; Johannes M Richter; Lorenzo Meraldi; Rashid M Altamimi; Ahmed Y Alyamani; Dan Credgington; Kevin P Musselman; Judith L MacManus-Driscoll; Richard H Friend

doi:10.1002/adma.201605987

Efficient Triplet Exciton Fusion in Molecularly Doped Polymer Light-Emitting Diodes

Adv Mater. 2017 Apr;29(13). doi: 10.1002/adma.201605987. Epub 2017 Feb 1.

Affiliations

¹ Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK.
² King Abudulaziz City for Science and Technology, Riyadh, 12371, Saudi Arabia.
³ Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
⁴ Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK.

PMID: 28145598
DOI: 10.1002/adma.201605987

Abstract

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.

Keywords: molecularly doped polymer OLEDs; singlet exciton fission; solid-state TTA upconversion; solution-processing; triplet exciton fusion.