Chromium Ion Pair Luminescence: A Strategy in Broadband Near-Infrared Light-Emitting Diode Design
| العنوان: | Chromium Ion Pair Luminescence: A Strategy in Broadband Near-Infrared Light-Emitting Diode Design |
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| المؤلفون: | Mu-Huai Fang, Ru-Shi Liu, Veeramani Rajendran, Sebastian Mahlik, Vanessa K. Peterson, Kuang-Mao Lu, Wen-Tse Huang, Natalia Majewska, Grzegorz Leniec, Ho Chang, Tadeusz Lesniewski, Slawomir Maksymilian Kaczmarek, Wei Kong Pang |
| المصدر: | Journal of the American Chemical Society. 143:19058-19066 |
| بيانات النشر: | American Chemical Society (ACS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Chemistry, Analytical chemistry, Phosphor, General Chemistry, Biochemistry, Catalysis, Ion, Paramagnetism, Colloid and Surface Chemistry, Radiant flux, Night vision, Quantum efficiency, Luminescence, Spectroscopy |
| الوصف: | 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. |
| تدمد: | 1520-5126 0002-7863 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a1c68e6ce9387bc28829d9dfb3df1c3Test https://doi.org/10.1021/jacs.1c08334Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....4a1c68e6ce9387bc28829d9dfb3df1c3 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15205126 00027863 |
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