English

Molecular orientation is key: a new perspective on revealing electronic behavior using two-photon emission spectroscopy

893
2024-03-19 16:20:43
See translation

Organic electronics has aroused great interest in academia and industry due to its potential applications in OLEDs and organic solar cells, with advantages such as lightweight design, flexibility, and cost-effectiveness. These devices are made by depositing organic molecular thin films onto a substrate that serves as electrodes and exerting their effects by controlling electron transfer between the film and substrate. Therefore, understanding the electronic behavior at the interface between the substrate and the thin film, as well as the electronic properties of organic thin films, is crucial for the further development of organic electronics. In addition, simultaneous observation of photocarrier electrons and intramolecular photoexcitation will provide more insights into organic molecular thin films.

Although a technique called photoelectron spectroscopy has been used to study the static electronic states of organic molecule films in detail, accurately detecting the dynamic behavior of electrons attempting to express their functions in devices has always been challenging and hindering progress.

The research team led by Associate Professor Masahiro Shibuta from the Graduate School of Engineering at Osaka City University used two-photon emission spectroscopy, scanning tunneling microscopy, and low-energy electron diffraction to observe the electronic behavior and surface structure of triphenyl molecular thin films deposited on graphite substrates. The results indicate that TP molecules exhibit a special structure, which adsorbs on the substrate in a standing structure. Under light irradiation, two electrons are injected into TP molecules from the substrate, and photoexcited electrons in the molecular thin film are successfully observed simultaneously in a single sample. In addition, strong photoluminescence was also observed on thin films with a special structure consisting of only one layer of molecules, where the molecules were diagonally adsorbed onto the substrate, similar to the case of TP molecules. It is expected that these results will contribute to the development of new luminescent materials and the further development of functional organic electronic devices.

"2PPE spectroscopy is still a new method for evaluating electronic states, but its drawback is that although well optimized measurements are time-consuming, electronic states are sometimes well observed and sometimes not," said Professor Shibuta. Our research findings emphasize that the visibility of electronic states is closely related to the adsorption mode and electronic properties of molecules on the substrate. In other words, not only the type of molecules, but also their arrangement must be appropriately controlled to create a device that can fully demonstrate their functions. I am pleased that our research provides insights for the development of functional materials for practical applications.

Source: Laser Net

Related Recommendations
  • Assisting Gas Mixing to Promote the Development of Fiber Laser Technology

    Just ten years ago, fiber laser cutting machines were considered experts in thin plates. The stores quickly realized that they had to invest in them to compete, at least by reducing their instrument materials. For high-quality sheet metal cutting, CO2 laser is still the way to go. Of course, fiber lasers can cut thicker blanks, but the quality is not very good, and their speed advantage almost dis...

    2024-01-11
    See translation
  • PsiQuantum completes $1 billion equity financing

    PsiQuantum, the Palo Alto startup at the forefront of photonics-based quantum computer development, says it will break ground on two manufacturing sites after closing a series E venture round that raised $1 billion.The new funding, led by private equity giant Blackrock and featuring several others including Nvidia’s venture capital wing, will enable the firm to build quantum computing sites in Bri...

    09-16
    See translation
  • AMC Theatres launches advanced laser projection technology upgrades

    AMC Cinema has long been known as the largest cinema operator in the United States and the world, and has completed upgrades to almost all its venues in the broader Chicago area, including advanced laser projection technology.The technological reform of this chain of stores has made Chicago one of the first areas in AMC's footprint to benefit from CinIonic's cutting-edge projection technology.In e...

    2023-12-23
    See translation
  • GeoCue introduces three new TrueView 3D imaging systems

    Earlier this month, GeoCue, a liDAR mapping hardware and software provider, announced the launch of three new products for its TrueView 3D imaging system. These new systems combine laser scanning and high-resolution imaging, including the TV625, TV680 and TV680LR. All three systems are NDAA-compliant.All three systems are designed to be used in conjunction with drones, and the company note...

    2023-08-04
    See translation
  • Novanta launches multi axis laser scanning head for microprocessing applications

    Novanta Corporation ("Novanta") announced the launch of the new generation of multi axis scanning head, the Precession Elephant III.This next-generation multi axis scanning head for microfabrication provides a simple upgrade path for existing and new customers to meet the growing market demand with faster and more accurate performance.The Precision Elephant III (PE III) utilizes proprietary optica...

    2024-07-18
    See translation