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Chromium ion pair luminescence: A strategy in broadband near-infrared light-emitting diode design

Journal Article


Abstract


  • Portable near-infrared (NIR) light sources are in high demand for applications in spectroscopy, night vision, bioimaging, and many others. Typical phosphor designs feature isolated Cr3+ ion centers, and it is challenging to design broadband NIR phosphors based on Cr3+-Cr3+ pairs. Here, we explore the solid-solution series SrAl11.88-xGaxO19:0.12Cr3+ (x = 0, 2, 4, 6, 8, 10, and 12) as phosphors featuring Cr3+-Cr3+ pairs and evaluate structure-property relations within the series. We establish the incorporation of Ga within the magentoplumbite-type structure at five distinct crystallographic sites and evaluate the effect of this incorporation on the Cr3+-Cr3+ ion pair proximity. Electron paramagnetic measurements reveal the presence of both isolated Cr3+ and Cr3+-Cr3+ pairs, resulting in NIR luminescence at approximately 650-1050 nm. Unexpectedly, the origin of broadband NIR luminescence with a peak within the range 740-820 nm is related to the Cr3+-Cr3+ ion pair. We demonstrate the application of the SrAl5.88Ga6O19:0.12Cr3+ phosphor, which possesses an internal quantum efficiency of ���85%, a radiant flux of ���95 mW, and zero thermal quenching up to 500 K. This work provides a further understanding of spectral shifts in phosphor solid solutions and in particular the application of the magentoplumbites as promising next-generation NIR phosphor host systems.

Publication Date


  • 2021

Citation


  • Rajendran, V., Fang, M. H., Huang, W. T., Majewska, N., Lesniewski, T., Mahlik, S., . . . Liu, R. S. (2021). Chromium ion pair luminescence: A strategy in broadband near-infrared light-emitting diode design. Journal of the American Chemical Society, 143(45), 19058-19066. doi:10.1021/jacs.1c08334

Scopus Eid


  • 2-s2.0-85119261181

Start Page


  • 19058

End Page


  • 19066

Volume


  • 143

Issue


  • 45

Place Of Publication


Abstract


  • Portable near-infrared (NIR) light sources are in high demand for applications in spectroscopy, night vision, bioimaging, and many others. Typical phosphor designs feature isolated Cr3+ ion centers, and it is challenging to design broadband NIR phosphors based on Cr3+-Cr3+ pairs. Here, we explore the solid-solution series SrAl11.88-xGaxO19:0.12Cr3+ (x = 0, 2, 4, 6, 8, 10, and 12) as phosphors featuring Cr3+-Cr3+ pairs and evaluate structure-property relations within the series. We establish the incorporation of Ga within the magentoplumbite-type structure at five distinct crystallographic sites and evaluate the effect of this incorporation on the Cr3+-Cr3+ ion pair proximity. Electron paramagnetic measurements reveal the presence of both isolated Cr3+ and Cr3+-Cr3+ pairs, resulting in NIR luminescence at approximately 650-1050 nm. Unexpectedly, the origin of broadband NIR luminescence with a peak within the range 740-820 nm is related to the Cr3+-Cr3+ ion pair. We demonstrate the application of the SrAl5.88Ga6O19:0.12Cr3+ phosphor, which possesses an internal quantum efficiency of ���85%, a radiant flux of ���95 mW, and zero thermal quenching up to 500 K. This work provides a further understanding of spectral shifts in phosphor solid solutions and in particular the application of the magentoplumbites as promising next-generation NIR phosphor host systems.

Publication Date


  • 2021

Citation


  • Rajendran, V., Fang, M. H., Huang, W. T., Majewska, N., Lesniewski, T., Mahlik, S., . . . Liu, R. S. (2021). Chromium ion pair luminescence: A strategy in broadband near-infrared light-emitting diode design. Journal of the American Chemical Society, 143(45), 19058-19066. doi:10.1021/jacs.1c08334

Scopus Eid


  • 2-s2.0-85119261181

Start Page


  • 19058

End Page


  • 19066

Volume


  • 143

Issue


  • 45

Place Of Publication