A series of BaLi 2 Al 2 Si 2 N 6 (BLASN): xEu 2+ phosphors are successfully synthesized and their crystal structure and luminescence properties under varying hydrostatic pressures are reported herein. Structure variation is analyzed using in situ high-pressure X-ray diffraction and Rietveld refinements. Based on decay curves and Gaussian fitting of emission spectra, the presence of two photoluminescence centers is demonstrated. BaLi 2 Al 2 Si 2 N 6 : 0.01Eu 2+ exhibits an evident peak position shift from 532 to 567 nm with an increase in pressure to ≈20 GPa. The possible factors and mechanisms for the variations are studied in detail. At a pressure of 16 GPa, BLASN: Eu 2+ realizes a narrow yellow emission with a full width at half maximum of ≈70 nm. The addition of BLASN: Eu 2+ (16 GPa) to the commercial white light-emitting diodes combination consisting of an InGaN chip, β-SiAlON: Eu 2+ , and red K 2 SiF 6 :Mn 4+ , can increase the color gamut by ≈15%, demonstrating the promising potential of pressure-driven BLASN: Eu 2+ for wide-color gamut spectroscopy applications. Moreover, the emission shifts arising from pressure variation and the distinct color changes enable its potential utility as an optical pressure sensor; the material exhibits high pressure sensitivity (dλ/dP ≈ 1.58 nm GPa −1 ) with the advantage of visualization.
solitude and the first time to help patients are becoming increasingly important and exigent. Fortunately, the development of science and technology has made this urgent demand no longer out of reach. [5] Over the past few decades, three mainstream fall monitoring methods have been developed, including vision-based, [6,7] ambient-based technologies, [8,9] and wearable-based, [10][11][12] according to the type and position of sensors that are installed in the systems. However, in the course of use, these methods
The optoelectronic sensor OPT101 have merits in advanced optoelectronic response characteristics at wavelength range for medical near-infrared spectroscopy and small-size chip design with build-in trans-impedance amplifier. Our lab is devoted to developing a series of portable near-infrared spectroscopy (NIRS) devices embedded with OPT101 for applications in intensive care unit clinics, based on NIRS principle. Here we review the characteristics and advantages of OPT101 relative to clinical NIRS instrumentation, and the most recent achievements, including early-diagnosis and therapeutic effect evaluation of thrombus, noninvasive monitoring of patients' shock severity, and fatigue evaluation. The future prospect on OPT101 improvements in noninvasive clinical applications is also discussed.
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