Laser & Optoelectronics Progress, Volume. 58, Issue 15, 1516009(2021)
Preparation and Luminescent Properties Research of Broadband Near-Infrared Fluoride Phosphor Cs2NaAlF6∶Cr3+
Fig. 1. Phase and structue characterization of Cs2NaAlF6∶Cr3+. (a) XRD patterns of Cs2NaAlF6∶xCr3+ phosphors with various Cr3+ doping concentrations; (b) enlarged image of XRD patterns in 26°‒28°; (c) refinement XRD pattern of Cs2NaAlF6∶0.30Cr3+; (d) structure of Cs2NaAlF6 crystal and two coordination environments of [AlF6]Ⅰ and [AlF6]Ⅱ based on refinement result
Fig. 2. SEM images of Cs2NaAlF6∶0.30Cr3+
Fig. 3. Luminescence characterization of Cs2NaAlF6∶Cr3+. (a) Excitation spectrum and emission spectrum of Cs2NaAlF6∶0.30Cr3+phosphor; (b) Tanabe-Sugano energy level diagrams of Cr3+in octahedral crystal field; (c) emission spectra of Cs2NaAlF6∶xCr3+(x=0.01‒0.40) phosphors; (d) Gaussian peak splitting fitting of emission spectra of Cs2NaAlF6∶0.30Cr3+phosphor
Fig. 4. Characterization of luminescent thermal stability of Cs2NaAlF6∶Cr3+ and fitted results. (a) Temperature-dependent emission spectra and (b) integrated emission intensity of Cs2NaAlF6∶0.30Cr3+ phosphor; (c) FWHM variation of emission band in Cs2NaAlF6∶0.30Cr3+ with temperature; (d) correlation between ln[(I0/IT)-1] and 1/kT for Cs2NaAlF6:0.30Cr3+ phosphor; (e) configuration coordinate diagram of Cr3+
Fig. 5. Emission spectra of pc-LED device and vein imaging application. (a) Emission spectra of pc-LED under various driving currents, insets are near-infrared pc-LED device photograph and luminous photograph; (b) output power and energy conversion efficiency of near-infrared light under different driven currents; (c) schematic diagram and (d) actual photograph of vein imaging of palm using near-infrared pc-LED device
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Fanquan He, Jiachang Wu, Peishan Shao, Enhai Song. Preparation and Luminescent Properties Research of Broadband Near-Infrared Fluoride Phosphor Cs2NaAlF6∶Cr3+[J]. Laser & Optoelectronics Progress, 2021, 58(15): 1516009
Category: Materials
Received: Mar. 24, 2021
Accepted: May. 19, 2021
Published Online: Jul. 28, 2021
The Author Email: Song Enhai (msehsong@scut.edu.cn)