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

Lee, Jaesang; Jeong, Changyeong; Batagoda, Thilini; Coburn, Caleb; Thompson, Mark E.; Forrest, Stephen R.

doi:10.1038/ncomms15566

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

Journal Article · Wed May 31 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms15566· OSTI ID:1389266

Lee, Jaesang ^[1]; Jeong, Changyeong ^[1]; Batagoda, Thilini ^[2]; Coburn, Caleb ^[3]; Thompson, Mark E. ^[2]; Forrest, Stephen R. ^[4]

Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Electrical and Computer Engineering
Univ. of Southern California, Los Angeles, CA (United States). Dept. of Chemistry
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Electrical and Computer Engineering, Dept. of Physics, Dept. of Materials Science and Engineering

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 (46.0 eV) that lead to molecular dissociation. 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. We believe that, this significant improvement results in the longest lifetime for such a blue PHOLED.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0007077

OSTI ID:: 1389266

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 155 works

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