Molecular Interdiffusion between Stacked Layers by Solution and Thermal Annealing Processes in Organic Light Emitting Devices

ACS Applied Materials & Interfaces
Satoru OhisaJunji Kido

Abstract

In organic light emitting devices (OLEDs), interfacial structures between multilayers have large impacts on the characteristics of OLEDs. Herein, we succeeded in revealing the interdiffusion in solution processed and thermal annealed OLEDs by neutron reflectometry. We investigated interfaces between a polymer under layer and small molecules upper layer. The small molecules diffused into the swollen polymer layer during the interfacial formation by the solution process, but the polymer did not diffuse into the small molecules layer. At temperatures close to the glass transition temperatures of the materials, asymmetric molecular diffusion was observed. We elucidated the effects of the interdiffusion on the characteristics of OLEDs. Partially mixing the interface improved the current efficiencies due to suppressed triplet-polaron quenching at the interface. Controlling and understanding the interfacial structures of the miultilayers will be more important to improve the OLED characteristics.

References

Mar 17, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Rintaro InoueMasahiro Hino
Apr 12, 2011·Nano Letters·Dian ChenThomas P Russell
Jan 4, 2012·Advanced Materials·Arthur R G SmithIan R Gentle
Oct 24, 2012·ACS Applied Materials & Interfaces·Takayuki ChibaJunji Kido
Sep 16, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew J ClulowPaul Meredith
Dec 9, 2014·Physical Chemistry Chemical Physics : PCCP·Dyfrig MônJonathan Rawle

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Citations

Dec 23, 2015·ACS Applied Materials & Interfaces·Samik JhulkiJarugu Narasimha Moorthy
Apr 14, 2017·ACS Applied Materials & Interfaces·Jake A McEwanIan R Gentle
Jan 5, 2019·Physical Chemistry Chemical Physics : PCCP·Dongsun YooSeungwu Han
Jun 26, 2021·ACS Applied Materials & Interfaces·Jake A McEwanIan R Gentle
Apr 28, 2020·ACS Applied Materials & Interfaces·Ja Yeon LeeMin Chul Suh
Jan 23, 2018·ACS Applied Materials & Interfaces·Jake A McEwanIan R Gentle

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