Investigation of the Cr:LiSrAlF<sub>6</sub>crystal by high-temperature Raman spectroscopy

Wang, Di; Wan, Songming; Zhang, Qingli; Sun, Dunlu; Gu, Guixin; Yin, Shi; Zhang, Guochun; You, Jinglin; Wang, Yuanyuan

doi:10.1088/1674-1056/20/10/108101

Chinese Phys. B

2011

DOI: 10.1088/1674-1056/20/10/108101

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Investigation of the Cr:LiSrAlF₆crystal by high-temperature Raman spectroscopy

Di Wang¹,

Songming Wan²,

Qingli Zhang³

et al.

Abstract: Wang Di( ) a) , Wan Song-Ming( ) a) , Zhang Qing-Li( ) a) , Sun Dun-Lu( ) a) , Gu Gui-Xin( ) a) , Yin Shao-Tang( ) a) † Zhang Guo-Chun( ) b) , You Jing-Lin( ) c) , and Wang Yuan-Yuan( ) c) a)

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Cited by 5 publications

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“…It can be anticipated that the replaced cations could form sublattices that distinguish the vibrational frequencies of the host lattice, leading to the splitting of the Raman peak. Although the XRD measurements show no change in the overall lattice symmetry, the appearance of peak splitting for doped samples indicates local changes in site symmetry. − Furthermore, the surface atom bonding and electronic structure of Cs 2 KIn 0.8 Al 0.1 F 6 :0.1Cr 3+ is studied using X-ray photoelectron spectroscopy (XPS) characterization. Figure d shows the XPS spectrum, where the inset shows the high-resolution Al 2p spectrum.…”

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confidence: 99%

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Wang

Han

Zhou

et al. 2023

J. Phys. Chem. Lett.

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The rising demand for portable near-infrared (NIR) light sources has accelerated the exploration of NIR luminescent materials with high efficiency and excellent thermal stability. Inspired by the structural-modulated ion substitution strategy, herein, a high-performance Cs2KIn0.8Al0.1F6:0.1Cr3+ phosphor with a peak at 794 nm and full width at half-maximum (fwhm) of 117 nm was successfully synthesized by introducing Al3+ ions. The high performance is reflected in its high internal quantum efficiency (IQE) of 88.06% and good thermal quenching resistance (I 423K = 71.64%). Compared with the initial Cs2KInF6:0.1Cr3+, the IQE and thermal stability are improved by 16.67% and 72.54%, which stem from the enhanced crystallinity and the strengthened structural rigidity. Finally, a phosphor-converted light-emitting diode (pc-LED) with a superior NIR photoelectric efficiency (21.04%@320 mA) was fabricated. Meanwhile, the pupil tracking, anticounterfeiting, intelligent identification, and bioimaging were successfully demonstrated. This work provides new perspectives for synthesizing efficient NIR fluoride phosphors and designing diverse applications.

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mentioning

confidence: 99%

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Wang

Han

Zhou

et al. 2023

J. Phys. Chem. Lett.

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Minimizing Bond Angle Distortion to Improve Thermal Stability of Cr³⁺ Doped Near‐Infrared Phosphor

Zhang

Wang

Liu

et al. 2023

Laser & Photonics Reviews

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Broadband near‐infrared (NIR) phosphor‐converted light‐emitting diodes are next‐generation smart NIR light sources. However, the NIR phosphor suffers from serious thermal quenching (TQ), resulting in efficiency reduction and spectral shift. Here, a novel strategy is realized to suppress TQ by minimizing bond angle distortion, completely different from the conventional TQ suppression approach through bond length variation. Li(Sr1−xCax)AlF6:Cr3+ NIR phosphor is taken as an example in which rotation between the two parallel fluorine planes perpendicular to the C3 axis in the [AlF6] octahedron is found to dominate TQ. Increasing x from 0 to 1 reduces the amplitude of the rotation from 16.17° to 5.06°, weakening the electron–phonon coupling and, consequently, raising the TQ temperature significantly from 320 to 570 K. This mechanism is elucidated from both theoretical calculations and spectroscopic studies. The findings open a new horizon for the exploration of thermally stable NIR phosphors.

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Transient simulation of cavitation evolution process in a diesel engine injector

Qiu

et al. 2022

International Journal of Engine Research

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In this study, a method for simulating the whole transient process of the cavitation evolution in a diesel injector was proposed. Diesel is taken as the fuel. The basic characteristics of partial, local, and super cavitation phenomena inside the injector were reproduced and discussed at different time steps. On the basis of movement features of the injector needle, Firstly, the moving process of the diesel injection such as the upward, suspension, and downward movements were simulated under different injector geometric parameters. The time-dependent movement process of the injector needle were controlled by a user-defined program developed by ourselves. Thereafter, a dynamic grid system and a two-phase flow cavitation numerical model were constructed and adopted to numerically reproduce the two-phase flow and the cavitation inside the injector. It was found that the volume fraction of the gas diesel during the partial cavitation is greater than that during the super-cavitation. The faster the needle valve opens, the earlier super-cavitation forms, but the gas volume fraction of diesel decreases faster in the injection orifice. Increasing the drain orifice diameter is helpful for earlier formation of the super-cavitation.

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Investigation of the Cr:LiSrAlF₆crystal by high-temperature Raman spectroscopy

Abstract: Wang Di( ) a) , Wan Song-Ming( ) a) , Zhang Qing-Li( ) a) , Sun Dun-Lu( ) a) , Gu Gui-Xin( ) a) , Yin Shao-Tang( ) a) † Zhang Guo-Chun( ) b) , You Jing-Lin( ) c) , and Wang Yuan-Yuan( ) c) a)

Cited by 5 publications

References 24 publications

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Minimizing Bond Angle Distortion to Improve Thermal Stability of Cr³⁺ Doped Near‐Infrared Phosphor

Transient simulation of cavitation evolution process in a diesel engine injector

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Investigation of the Cr:LiSrAlF6crystal by high-temperature Raman spectroscopy

Abstract: Wang Di( ) a) , Wan Song-Ming( ) a) , Zhang Qing-Li( ) a) , Sun Dun-Lu( ) a) , Gu Gui-Xin( ) a) , Yin Shao-Tang( ) a) † Zhang Guo-Chun( ) b) , You Jing-Lin( ) c) , and Wang Yuan-Yuan( ) c) a)

Cited by 5 publications

References 24 publications

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs2KIn1–yAlyF6:Cr3+ Solid Solutions

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs2KIn1–yAlyF6:Cr3+ Solid Solutions

Minimizing Bond Angle Distortion to Improve Thermal Stability of Cr3+ Doped Near‐Infrared Phosphor

Transient simulation of cavitation evolution process in a diesel engine injector

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Product

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Investigation of the Cr:LiSrAlF₆crystal by high-temperature Raman spectroscopy

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Ion Substitution Strategy toward High-Efficiency Near-Infrared Photoluminescence of Cs₂KIn_1–yAl_yF₆:Cr³⁺ Solid Solutions

Minimizing Bond Angle Distortion to Improve Thermal Stability of Cr³⁺ Doped Near‐Infrared Phosphor