Expanding near-infrared emission bandwidth in K2NaCrF6:Fe3+ phosphors through dipole-dipole energy transfer
Source abstract
Abstract
Currently, the application potential of Cr 3+ doped near-infrared (NIR) fluoride phosphors excited by blue light is promising. However, the development of near-infrared fluoride phosphors with wider emission bandwidth remains a challenge. Herein, we employed the hydrothermal method to prepare K 2NaCrF 6:Fe 3+ phosphors. Upon excitation at 432 nm, the K 2NaCrF 6:xFe 3+ phosphors exhibited broad near-infrared emission, with the main peak ranging from 752 nm to 780 nm. As the Fe 3+ concentration increased, the luminescence intensity of the K 2NaCrF 6:xFe 3+ phosphor decreased, accompanied by a redshift in the emission band and an increase in the full width of the emission spectrum half-peak. These changes can be attributed to the dipole-dipole interaction, specifically the energy transfer between Fe 3+ and Cr 3+, leading to the 4T 2( 4F) → 4A 2(Cr 3+) and 4T 1( 4G) → 6A 1( 6S) (Fe 3+) transitions.
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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Inorganic Fluorides and Related Compounds · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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