Journal
INORGANIC CHEMISTRY
Volume 61, Issue 5, Pages 2530-2537Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c03377
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Funding
- Ministry of Science and Technology of Taiwan [MOST 109-2113-M027-004, MOST 109-2622-M-027-001-CC2, MOST 1102113-M-027-012, MOST 110-2622-M-027-001]
- Council of Agriculture, Executive Yuan [110AS17.1.2-ST-a5]
- University System of Taipei [USTP-NTUTTMU-109-02, USTP-NTUT-TMU-110-02]
- Lextar Electronics Corporation
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In this study, a white phosphor-based near-infrared (NIR) lighting material with high internal quantum efficiency and wide spectral range was developed. By designing a NIR ceramic device, dental problems such as caries and tooth calcification can be effectively detected.
The analysis of human body composition and food composition requires high-efficiency broadband near-infrared (NIR) lighting sources to achieve a portable, appropriately sized equipment. Herein, we develop a whitlockite-type NIR phosphor Sr9Sc(PO4)(7):Cr3+ with an emission centered at 860 nm and full width at half-maximum of 147 nm. Due to the structural characteristics of the matrix, the 60 mol % Cr3+ substitution at the Sc3+ sites gives an internal quantum efficiency up to 56.5%. By replacing Sr with Ba and Ca, we observe a nontypical spectral shift phenomenon and discuss the influence of the second-sphere effect on octahedral Cr3+ ions. To evaluate the diagnostic application, we design a NIR ceramic device with a high optical power of 27.38 mW and high heat dissipation, which can decrease surface working temperature by nearly 50 degrees C for digital intraoral application. This study provides the research of the second-sphere coordination effect for selective octahedral sites such as Ca, Sr, and Ba coordinated by O atoms on a whitlockite-type crystal. Furthermore, the device promotes a nonionizing solution for detecting dental caries, tooth calcification, and diagnostic application.
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