Temporal stability of blue phosphorescent organic light-emitting diodes affected by thermal annealing of emitting layers

Lee, Thomas Y.-H.; Wang, Qiang; Wallace, Jason U.; Chen, Shaw H.

doi:10.1039/c2jm35050e

Temporal stability of blue phosphorescent organic light-emitting diodes affected by thermal annealing of emitting layers

Journal Article · Thu Sep 19 04:00:00 EDT 2019 · Journal of Materials Chemistry

DOI:https://doi.org/10.1039/c2jm35050e· OSTI ID:1095089

Lee, Thomas Y.-H. ^[1]; Wang, Qiang; Wallace, Jason U.; Chen, Shaw H.

Laboratory for Laser Energetics, University of Rochester, Rochester, NY

Emitting layers were thermally annealed at 20 to 100 °C for varying durations without causing phase transformation in the rest of the PhOLEDs. Heating EMLs above their T_gs with a free surface created pinholes filled by the underlying TAPC melt with concurrent interlayer mixing to emit satellite peaks accompanying FIrpic's phosphorescence. With a robust glassy TmPyPB layer on top of the EML, pinholes and fortuitous fluorescence could be prevented. Annealing of mCP:SiPh4:FIrpic induced crystallization in 1 h, while mCP-$$\mathscr{L}$$-PhSiPh3:FIrpic consistently resisted crystallization under all conditions. Crystallization or pinhole formation diminished EQE and driving voltage at the same time. Without incurring pinhole formation in the absence of a free surface presented by the EML, annealing of mCP:SiPh4:FIrpic at 60 °C for 1 h led to about 50% loss in EQE. In contrast, the pristine device's EQE persisted with mCP-$$\mathscr{L}$$-PhSiPh3:FIrpic annealed at 60 °C for up to 24 h, beyond which other sources of device failure took over. The concept of bipolar hybrids holds promise for mitigating morphological instability as part of the challenge to the PhOLED device lifetime.

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE

DOE Contract Number:: FC52-08NA28302

OSTI ID:: 1095089

Report Number(s):: DOE/NA/28302-1088; 2012-166; 2064

Journal Information:: Journal of Materials Chemistry, Journal Name: Journal of Materials Chemistry Journal Issue: 43 Vol. 22; ISSN 0959-9428

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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