Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes

Jaesang Lee, Changyeong Jeong, Thilini Batagoda, Caleb Coburn, Mark E. Thompson and Stephen R. Forrest ()
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Jaesang Lee: University of Michigan
Changyeong Jeong: University of Michigan
Thilini Batagoda: University of Southern California
Caleb Coburn: University of Michigan
Mark E. Thompson: University of Southern California
Stephen R. Forrest: University of Michigan

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Since their introduction over 15 years ago, the operational lifetime of blue phosphorescent organic light-emitting diodes (PHOLEDs) has remained insufficient for their practical use in displays and lighting. Their short lifetime results from annihilation between high-energy excited states, producing energetically hot states (>6.0 eV) that lead to molecular dissociation. Here we introduce a strategy to avoid dissociative reactions by including a molecular hot excited state manager within the device emission layer. Hot excited states transfer to the manager and rapidly thermalize before damage is induced on the dopant or host. As a consequence, the managed blue PHOLED attains T80=334±5 h (time to 80% of the 1,000 cd m−2 initial luminance) with a chromaticity coordinate of (0.16, 0.31), corresponding to 3.6±0.1 times improvement in a lifetime compared to conventional, unmanaged devices. To our knowledge, this significant improvement results in the longest lifetime for such a blue PHOLED.

Date: 2017
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DOI: 10.1038/ncomms15566

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