Work

MgAl 2 O 4 :Cr 3+ translucent ceramics with tunable broadband near‐infrared luminescence for laser‐driven light source detection

Year: 2025

Type: article

Abstract: High‐power broadband near‐infrared (NIR) light sources have attracted extensive interest toward emerging non‐invasive imaging and detection applications. However, exploring highly stable luminescent materials with targeted broadband NIR emission remains a great challenge. Here, MgAl 2 O 4 :Cr 3+ translucent ceramics have been designed and fabricated by a spark plasma sintering method, and a giant redshift of the emission band occurs from 686 to 928 nm due to the decreasing local structural symmetry around the isolated Cr 3+ ions induced by the abundant cation vacancies. As Cr 3+ content increases, MgAl 2 O 4 :6%Cr 3+ ceramic realizes the optimized external quantum efficiency of 73% with broadband NIR emission centered at 890 nm and a full‐width at half‐maximum of 315 nm under 450 nm excitation. The next‐generation laser‐driven light source containing NIR ceramic provides an output power exceeding 2 W and a light conversion efficiency of 22% when pumped with a blue laser of 10 W·mm −2 . The proof‐of‐concept demonstrations in imaging and detection reveal the advantages of high‐power and high‐efficiency laser‐driven broadband NIR light sources and promote future development in the chemical design of NIR emitters. image

Source: InfoMat

DOI: 10.1002/inf2.70020

Authors: Gaochao Liu, Zhan Xiong, Weibin Chen, Shuai Zhang, Yuzhen Wang, Zhiguo Xia

Institutions: State Key Laboratory of Luminescent Materials and Devices, South China University of Technology

Language: English

Topic: Luminescence Properties of Advanced Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,000

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China