Thank you Justin for further clarification. We do have some work in progress on ETL with grapheme; but the key point is being able to manipulate the work function. In the case of rGO and GO this is possible by controlling the reduction process. See how this is exemplified in the opto-electronic properties represented by the PL here: ( https://www.researchgate.net/publication/284194878_The_Band_Structure_of_Graphene_Oxide_Examined_Using_Photoluminescence_Spectroscopy)
Similar 'controlled changes in the work function can be achieved with functionalised CNT (https://www.researchgate.net/publication/235912888_High_luminance_organic_light-emitting_diodes_with_efficient_multi-walled_carbon_nanotube_hole_injectors ) or with dipole layers (https://www.researchgate.net/publication/254199895_Superficial_fluoropolymer_layers_for_efficient_light-emitting_diodes ) in the case of OLEDs.
The reason for Go/rGO is the solubalised nature of it makes it easy to apply and produce as functional inks.
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Hi, band gap in pure graphene is zero, so the fluorescence properties in pure graphene seem been unlikely, but graphene quantum dots have very good fluorescence properties, that can be used in OLED.
sir u misunderstood the sentence i asked about hole injection layer /electron transport layer..........
I think that reduced graphene layer with enough conductivity can be used. In last years several papers have been published, where graphene is used as conductor in organic electronic devices.
Graphene and its derivatives such as GO can be used for both ETL and HTLs in OLED as well as OPV. It all depends on being able to match the energy levels to the devices being proposed, as well as getting mixtures of solutions that are compatible with each other (layers). As an example please look at the following paper with its energy band diagrams for use of GO in OPV: https://www.researchgate.net/publication/259559308_Hybrid_Graphene-Metal_Oxide_Solution_Processed_Electron_Transport_Layers_for_Large_Area_High-Performance_Organic_Photovoltaics
https://www.researchgate.net/publication/264694567_Graphene_oxide_hole_transport_layers_for_large_area_high_efficiency_organic_solar_cells
Also, look at the following for use of GO in OLEDs: https://www.researchgate.net/publication/235419297_Solution-Processable_Graphene_Oxide_as_an_Efficient_Hole_Injection_Layer_For_High_Luminance_Organic_Light-Emitting_Diodes
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Thanks prof.
Very much correct what Prof. SRP silva said. Graphene has low work function in compare to GO and has very high conductivity, hence people prefer it for electrode ( DOI: 10.1038/ncomms3294) rather than HIL or HTL or ETL. however, you may find rGO as ETL/EIL in the above papers he mentioned, being an ETL/EIL it should have the low WF and somewhat high conductivity. Above papers are really useful, in the context for OLED you should find the concentration which maintain charge balance in your architecture. Last paper (S. Shi et al.) could be a better answer for you.
In general, low WF (4.7 eV) fruitful for HIL/HTL. In addition, if it is a bulk system like organic semiconductors (as HIL or EIL) we need to consider superior mobility it offered for carriers (whether for electron/hole).
Thank you Justin for further clarification. We do have some work in progress on ETL with grapheme; but the key point is being able to manipulate the work function. In the case of rGO and GO this is possible by controlling the reduction process. See how this is exemplified in the opto-electronic properties represented by the PL here: ( https://www.researchgate.net/publication/284194878_The_Band_Structure_of_Graphene_Oxide_Examined_Using_Photoluminescence_Spectroscopy)
Similar 'controlled changes in the work function can be achieved with functionalised CNT (https://www.researchgate.net/publication/235912888_High_luminance_organic_light-emitting_diodes_with_efficient_multi-walled_carbon_nanotube_hole_injectors ) or with dipole layers (https://www.researchgate.net/publication/254199895_Superficial_fluoropolymer_layers_for_efficient_light-emitting_diodes ) in the case of OLEDs.
The reason for Go/rGO is the solubalised nature of it makes it easy to apply and produce as functional inks.
Article The Band Structure of Graphene Oxide Examined Using Photolum...
Article High luminance organic light-emitting diodes with efficient ...
Article Superficial fluoropolymer layers for efficient light-emitting diodes
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