Jump to content
  • Sign Up
  • Create New...

Highly efficient and stable near-infrared phosphor for night vision and bio-imaging

Pelican Press

Recommended Posts

Highly efficient and stable near-infrared phosphor for night vision and bio-imaging

by KeAi Communications Co.

Broadband near-infrared luminescence theory and application. Credit: Gui-Hua Li, et al

Near-infrared (NIR) light source, characterized by non-destructive and rapid detection, has a wide range of applications in diverse fields including food testing, safety, sensing, agricultural production and biomedicine. The availability of a compact, highly efficient and low-cost NIR phosphor is a key factor in achieving its wide application.

NIR pc-LED, boasting qualities such as lower cost and adjustable emission wavelength, has received widespread attention. The key ***** in the development of NIR luminescent materials with broadband emission, high luminous efficiency and thermal stability. The tunable luminescent properties of Cr3+ have attracted the attention of researchers.

Nevertheless, the diversity in Cr3+ luminescence centers across various hosts poses a challenge. In previous studies, there are different views on whether the near-infrared luminescence of Cr3+ comes from 4-ligand or 6-ligand or 8-ligand. Systematic and in-depth research is essential to elucidate the relationship between Cr3+‘s occupancy habit and responding photoluminescence properties.

To that end, a team of researchers led by Gemei Cai at the Central South University in China, examined the luminescent properties and crystal field environment of Cr3+ in special matrix Y2Mg2Al2Si2O12 with multiple cationic sites. The NIR pc-LEDs were made from the developed NIR-emitting phosphors, and the potential applications of these NIR light sources in night vision, bio-imaging, and non-intrusive detection were demonstrated.

“With the help of crystallographic investigation, spectroscopy characterization, and crystal-field-strength analyses, Cr1, Cr2, and Cr3 are verified to be originated from Cr3+ in Al/SiO4 tetrahedral, Mg/AlO6 octahedral, and Y/MgO8 dodecahedral sites, respectively,” says Cai.

“Potential applications for this assembled miniaturized NIR pc-LED include night visualization, bio-imaging, and non-intrusive detection, as demonstrated by the clear visualization of blood vessels in a hand as well as chip and circuit layout on a magnetic card under NIR illumination.”

The findings,

This is the hidden content, please
in the journal Advanced Powder Materials, present Cr3+-activated NIR phosphors with features of outstanding luminescence for multi-functional applications. The study also demonstrates the feasibility of the strategy via designing the multi-luminescent centers with intermediate-weak crystal field environment for Cr3+ to achieve broadband emission.

More information:
Gui-Hua Li et al, Achieving broadband near-infrared luminescence in Cr3+-Activated Y2Mg2Al2Si2O12 phosphors via multi-site occupancy, Advanced Powder Materials (2024).

This is the hidden content, please

Provided by
KeAi Communications Co.

Highly efficient and stable near-infrared phosphor for night vision and bio-imaging (2024, April 17)
retrieved 17 April 2024

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

This is the hidden content, please

Science, Physics News, Science news, Technology News, Physics, Materials, Nanotech, Technology, Science
#Highly #efficient #stable #nearinfrared #phosphor #night #vision #bioimaging

This is the hidden content, please

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    • No registered users viewing this page.

Important Information

Privacy Notice: We utilize cookies to optimize your browsing experience and analyze website traffic. By consenting, you acknowledge and agree to our Cookie Policy, ensuring your privacy preferences are respected.