Stable and Highly Efficient Near‐Infrared Emission Achieved in Spinel Blocks
Abstract
AbstractDeveloping efficient and stable near‐infrared emitters related to Cr3+‐pairs for advanced optoelectronic devices remains a challenge due to concentration quenching effects and unclear luminescence mechanisms. In this study, Cr3+ ions are incorporated into a matrix structure consisting of ZnAl₂O₄ spinel units separated by 11.312 Å, effectively restricting energy transfer between luminescent centers and alleviating quenching effects. Computational analysis identifies the lattice positions of isolated Cr3+ ions and Cr3+‐pairs at different doping levels, providing insights into their spatial distribution and local structural environments. Photoluminescence measurements reveals a Cr3+‐concentration‐dependent emission broadening, with a Cr3+‐pair emission band peak at 750 nm, while detailed spectral analysis further clarified the energy level structure of Cr3+‐pairs for the first time. Enhanced material performance is achieved through flux‐assisted synthesis, reaching a high external quantum efficiency of 58.3%. Consequently, the assembled pc‐LEDs exhibit minimal efficiency roll‐off and achieve a high output of 183 mW at 650 mA, demonstrating their potential in near‐infrared light sources and night vision technology application.
Article Details
Authors (3)
Xibao Zhang
Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
Liang Zhou
Hongpeng You
State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China