Professor Yury Gogotsi AM: Efficient MXene-based organic light-emitting diode

Although the transparent conductive material of carbon nanotubes, graphene, conductive polymer, etc. In optoelectronic devices of the flexible electrodes have to extensive research, but low electrical conductivity, poor performance, the electrode manufacturing process complicated problems limit its practical application.

Achievements

Recently, Drexel University ‘s Yury Gogotsi professor and Seoul National University of Tae-Woo Lee Professor in the top international journal Advanced Materials published entitled " A 2D Titanium Carbide MXene Flexible Electrode for High-Efficiency Light-Emitting Diodes Incorporated " paper . A two-dimensional titanium carbide (Ti 3 C 2 ) MXene film with the characteristics of a transparent conductive electrode (TCE) is reported . Its high electrical conductivity (≈11670 S cm ⁻¹ ) and high work function (≈5.1 eV) make it simple It is prepared by combining the solution treatment and surface composition adjustment. The chemical neutralization strategy is adopted to prevent the harmful surface oxidation and the degradation of the electrode film by the conductive polymer hole injection layer. The current efficiency of the organic light-emitting diode made by the MXene electrode reaches 102.0 cd A ⁻¹ and the external quantum efficiency is 28.5% ph / el, which is in good agreement with the theoretical maximum value of optical simulation. The results show that MXene has great potential for use in solution processable electrodes in photovoltaic devices, providing guidance for the application of MXenes as TCEs in low-cost flexible photovoltaic devices.

Figure  1 Schematic diagram of the MXene film prepared by the rotation method .

Figure  2  Contact potential difference between ITO and Ti 3 C 2  MXene electrodes.

Figure  3  Chemical composition of n-GraHIL .

Figure  4  Electrical properties of organic LEDs .

in conclusion

In short, the feasibility of a single layer of Ti 3 C 2  MXene for flexible TCE for solution processing was proved, and for the first time, high-efficiency MXene -based organic light-emitting diodes were produced using precise surface and interface engineering . The current efficiency of the organic light-emitting diode is about 102.0 cd A ⁻¹ and the external quantum efficiency is 28.5% ph / el , which is in good agreement with the theoretical maximum value of optical simulation. This work has great guiding significance for low-cost solution processing technology for next-generation optoelectronic products.

Original link:

https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202000919

Source: MXene Academic