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

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

SUBMITTER: Lee J 

PROVIDER: S-EPMC5460033 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature