English

A research team from the University of Chicago in the United States has demonstrated a new method for obtaining mid infrared emission using colloidal quantum dots (QDs)

1174
2023-09-21 15:52:59
See translation

According to reports, a research team at the University of Chicago in the United States recently demonstrated a new method for obtaining mid infrared emission using colloidal quantum dots (QDs), which may open up new applications for mid infrared light sources.

Colloidal quantum dots are a type of semiconductor nanocrystal material that provides a promising approach for the synthesis of light sources in large quantities through wet chemical solution processing technology.

The electroluminescence of colloidal quantum dots in the visible light range has been highly efficient and cost-effective, but other wavelengths have been proven to be more challenging so far, especially in the mid infrared region.


The Philippe Guyot SiOnnest Laboratory (PGS Laboratory) at the University of Chicago specializes in the study of nanocrystalline quantum dots generated by colloidal synthesis chemistry. A colloidal quantum dot with significantly improved emission characteristics in the mid infrared band has been developed and its research results have been published in the journal Nature Photonics.

Mid infrared light source
Xingyu Shen from PGS Laboratory commented, "This cost-effective and easy-to-use method of manufacturing infrared light sources using quantum dots may be very useful. This discovery may ultimately lead to significantly cheaper mid infrared LEDs and lasers, or new technological applications.

The above work is based on the previous research on the manufacturing and performance of quantum dot devices in PGS laboratory, including efforts to improve the size distribution of nanoparticles and the development of nanocrystalline quantum dot infrared detectors, which may be comparable to commercial devices at extremely low costs.

In 2022, the research team demonstrated the first mid infrared colloidal quantum dot LED based on mercury telluride (HgTe), which has semiconductor properties and stability, facilitating infrared emission. The team pointed out at the time that this quantum dot "has the potential to break the extremely high 'cost/gram' of infrared imaging through exciting new manufacturing processes.

In the new project, the team further studied the manufacturing technology and luminescence methods of colloidal quantum dots, inspired by the established laser emission cascade method, where electrons pass through a series of different energy levels and emit a portion of energy in the form of light at each level.

According to the PGS laboratory, so far this cascade technology has never been achieved using colloidal quantum dots. The laboratory has created a black "ink" of HgTe nanocrystals, which are "coated" on a substrate and illuminated by an electric current.

According to a paper published by the team in the journal Nature Photonics, the colloidal quantum dot emits a quantum efficiency of 4.5% μ The mid infrared light of m is close to commercial epitaxial cascaded quantum well light-emitting diodes. Through further optimization, this cascading method may surpass existing methods.

We are very excited about this possibility, "Guyot SiOnnest said." This is one of the best examples of potential applications of colloidal quantum dots. More applications can be achieved through other materials, but this system architecture really works because of quantum mechanics. I think it is driving the field forward in a very interesting way.

Source: Sohu

Related Recommendations
  • Low noise! Switzerland develops a new type of laser

    According to foreign media reports, scientists from the Physics Research Institute and the Institute of Physics and the Center for Quantum Science and Engineering at the Swiss Federal Institute of Technology Lausanne (EPFL) in Lausanne, Switzerland have made a new progress in the field of excitation science, developing a smaller and quieter laser system than previous products.Small laser system (I...

    2024-07-03
    See translation
  • Shanghai Institute of Optics and Fine Mechanics has made progress in composite material based picosecond mirrors

    Recently, the High Power Laser Element Technology and Engineering Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made progress in the research of composite based picosecond mirrors. The related research results were published in Optics and Laser Technology under the title of "Hybrid Material Based Mirror Coatings for Picosed Laser Applications"....

    2024-07-12
    See translation
  • Laser gyroscopes measure small changes in daytime length on Earth

    Recently, scientists used laser gyroscopes to measure that the change in Earth's rotational speed is less than one millionth. This technology can help scientists understand the complex flow of water and air, which can cause the smallest adjustments to the Earth's rotation.The Earth's rotation is not completely stable. Planets accelerate or slow down as they rotate, slightly shortening or prolongin...

    2023-09-19
    See translation
  • Teledyne Technologies acquires a portion of its optoelectronic business

    Recently, Teledyne Technologies announced that it has reached an agreement to acquire a portion of Excelitas Technologies' aerospace and defense electronics business for $710 million in cash.This acquisition includes the optical systems business under the Qioptiq brand headquartered in North Wales, UK, as well as the Advanced Electronic Systems (AES) business headquartered in the United States.It ...

    2024-11-12
    See translation
  • Progress in Research on Intervalley Scattering and Rabi Oscillation Driven by Coherent Phonons

    Two dimensional transition metal chalcogenides have multi valley structures in their energy bands, giving them electron valley degrees of freedom, making them an ideal platform for studying multi body interactions. As the main mechanism of valley depolarization, the valley scattering process of free electrons or bound excitons is crucial for exploring excited state electron phonon interactions and...

    2023-10-10
    See translation