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)

1169
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
  • Shanghai Optics and Machinery Institute has made progress in near-field state analysis of high-power laser devices based on convolutional neural networks

    Recently, the research team of the High Power Laser Physics Joint Laboratory of the Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics identified and analyzed the abnormal near-field output of the SG - Ⅱ upgrade device by using the spatial domain computing method and the deep learning model with attention mechanism in response to the requirements of real-time and effective...

    2024-04-25
    See translation
  • STREAMLIGHT Upgrade TLR RM Light with Red or Green Laser

    Streamlight, a leading supplier of high-performance lighting and weapon lights/laser aiming equipment, has launched upgraded models of its TLR RM 1 and TLR RM 2 series of lights, each now equipped with an HPL face cap, providing ultra bright beams of up to 1000 lumens and an extended range of up to 22000 candela.The popular TLR RM 1 and TLR RM 2 models are equipped with red or green lasers, both o...

    2024-02-23
    See translation
  • TroGroup announces acquisition of Luxinar Ltd.

    Recently, TroGroup, a family owned laser giant operating globally in Austria, announced a major strategic move - the successful acquisition of Luxinar Ltd., a leading laser source manufacturer based in Hull, UK. This move marks a new level of TroGroup's technological leadership in the field of laser sources.Through this acquisition, Luxinar, with its approximately 200 elite team and over 25 years ...

    2024-08-03
    See translation
  • Q.ANT Secures $18 Million in Refinancing for Photonic AI

    Q.ANT, a developer of artificial intelligence and high-performance computing (HPC) photonic processing systems, announced the completion of the second round of its Series A financing, reportedly valued at $18 million. The investment was led by Duquesne Family Office LLC, the investment firm of Stanley F. Druckenmiller. The increase brings Q.ANT’s total funding to US$80 M – claimed to be the larges...

    10-31
    See translation
  • LASER World of PHOTONICS CHINA- 20th Anniversary Celebration Coming Soon!

    The Annual Grand Event for the Laser, Optics, and Optoelectronics Industry in AsiaLASER World of PHOTONICS CHINA20th Anniversary Celebration Coming Soon!? March 11-13? Shanghai New International Expo Centre (SNIEC), Entrance Hall 3? Halls: N1-N5, E7-E4? 1,400+ exhibitors across over 100,000 square meters Visitor Opening HoursDay 1: March 11 (Tuesday) 9:00 - 17:00Day 2: March 12 (Wednesday)...

    03-10
    See translation