Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 14, Pages 11794-11800Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00137
Keywords
push-coating; PLED; F8BT; MEH-PPV; nanofabrication; self-assembly
Funding
- University of Electro-Communications Financial Support for Researcher Exchange
- CNR
- RAS
- Grants-in-Aid for Scientific Research [17K14549] Funding Source: KAKEN
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Push-coating is a green and extremely low-cost process in which only few microliters of conjugated polymer solutions are used to produce thin films using capillary forces. Here, we adapt this fabrication technique to replicate self assembled nanoporous structures on green and red light emitting conjugated polymer thin films. These films display ring-like photoluminescence and are successfully integrated into polymer light-emitting devices as emitting layers. At low applied voltages, the green-emitting devices exhibit electroluminescence (EL) from hexagonally arranged nanopixel arrays resulting from a stronger electric field in the thinner areas inside the pores. By gradually increasing the voltage up to 10 V, the emission extends to the areas around the pores. At voltages higher than 10 V, a nonreversible nanopixel to nanoringlike switching of the EL can be observed. After filling the pores with a second blue-emitting conjugated polymer, voltage dependent reversible color tuning of the EL is achieved in the nanostructured light-emitting bilayers.
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