Ultra-broad Near-Infrared Emitting Phosphor LiInF4: Cr3+ with Extremely Weak Crystal Field.

Recent decades have witnessed a major development in broadband near-infrared (NIR)-emitting phosphors because of their potential applications in real-time nondestructive examination. These applications require the emission spectra of phosphors to be as broad as possible for efficient performance. Therefore, a blue-light excited LiInF4: Cr3+ phosphor with a NIR emission covering 700-1400 nm is successfully synthesized. Under 470 nm excitation, it shows broadband emission peaked at 980 nm with the full-width at half maximum of 210 nm. The structure and crystal field environment are investigated in detail, and the LiInF4: Cr3+ possesses a weak crystal field strength and strong electron-phonon coupling. An efficient NIR phosphor-converted light-emitting diode (pc-LED) is fabricated by the prepared LiInF4: Cr3+ phosphor and commercial blue diode chip, generating a NIR radiant flux of 5.54 mW at 150 mA drive current. Finally, the NIR pc-LED is successfully applied to identify the blood vessel distribution of the hand. This work suggests the potential of LiInF4: Cr3+ phosphor in applications.

[1]  Hongzhou Lian,et al.  LaMgGa11O19:Cr3+,Ni2+ as Blue‐Light Excitable Near‐Infrared Luminescent Materials with Ultra‐Wide Emission and High External Quantum Efficiency , 2023, Advanced Optical Materials.

[2]  Jun Lin,et al.  Recent Advances in Chromium‐Doped Near‐Infrared Luminescent Materials: Fundamentals, Optimization Strategies, and Applications , 2022, Advanced Optical Materials.

[3]  J. Zuo,et al.  Ultra-broad NIR emission from two-site Cr3+ occupation in fluoride phosphor via composition-driven structural transformation , 2022, Materials Today Chemistry.

[4]  Hongbin Liang,et al.  Shining Transparent Displays with Stable Narrow‐Band Blue‐Emitting Phosphor in Layered Film , 2022, Advanced materials.

[5]  Z. Song,et al.  Advances in Chromium‐Activated Phosphors for Near‐Infrared Light Sources , 2022, Laser & Photonics Reviews.

[6]  Z. Song,et al.  Energy Level Diagram of 3d2 Configuration in Tetrahedral Crystal Field and Its Applications to Cr4 + /Mn5 + ‐Doped Luminescent Materials , 2022, Advanced Theory and Simulations.

[7]  Jing Wang.  Environmentally friendly Fe3+-activated near-infrared-emitting phosphors for spectroscopic analysis , 2022, Light: Science & Applications.

[8]  Haojun Yu,et al.  Green HF-Free Synthetic Route to the High-Efficiency K2NaGaF6:Cr3+ Phosphor and Its NIR-LED Application toward Veins Imaging , 2022, ACS Sustainable Chemistry & Engineering.

[9]  S. Adachi.  Full understanding of K3GaF6:Cr3+ properties under hydrostatic pressure based on the Tanabe−Sugano energy-level diagram , 2022, Journal of Luminescence.

[10]  Jun Lin,et al.  Highly efficient Fe3+-doped A2BB′O6 (A = Sr2+, Ca2+; B, B′ = In3+, Sb5+, Sn4+) broadband near-infrared-emitting phosphors for spectroscopic analysis , 2022, Light, science & applications.

[11]  S. Tsuchikawa,et al.  Application of near-infrared spectroscopy to agriculture and forestry , 2022, Analytical Sciences.

[12]  Haomiao Zhu,et al.  An efficient garnet-structured Na3Al2Li3F12:Cr3+ phosphor with excellent photoluminescence thermal stability for near-infrared LEDs , 2021 .

[13]  M. Khoshayand,et al.  Multivariate analysis of food fraud: A review of NIR based instruments in tandem with chemometrics , 2021, Journal of Food Composition and Analysis.

[14]  Xinyu Ye,et al.  Cr3+-activated Na3X2Li3F12 (X=Al, Ga, In) garnet phosphors with broadband NIR emission and high luminescence efficiency for potential biomedical application , 2021, Journal of Materials Chemistry C.

[15]  Xiao-jun Wang,et al.  Broadband Short-Wave Infrared Light-Emitting Diodes Based on Cr3+-Doped LiScGeO4 Phosphor. , 2021, ACS applied materials & interfaces.

[16]  Xianfeng Yang,et al.  A General Ammonium Salt Assisted Synthesis Strategy for Cr3+‐Doped Hexafluorides with Highly Efficient Near Infrared Emissions , 2021, Advanced Functional Materials.

[17]  Jun Jiang,et al.  The hydrothermally synthesis of K 3 AlF 6 :Cr 3+ NIR phosphor and its performance optimization based on phase control , 2021 .

[18]  Fugen Wu,et al.  Trivalent Chromium Ions Doped Fluorides with Both Broad Emission Bandwidth and Excellent Luminescence Thermal Stability. , 2021, ACS applied materials & interfaces.

[19]  Yan’gai Liu,et al.  Broadband near-infrared emission of K3ScF6:Cr3+ phosphors for night vision imaging system sources , 2021 .

[20]  Z. Xia,et al.  Li/Na substitution and Yb3+ co-doping enabling tunable near-infrared emission in LiIn2SbO6:Cr3+ phosphors for light-emitting diodes , 2021, iScience.

[21]  S. Adachi.  Review—Photoluminescence Properties of Cr3+-Activated Fluoride Phosphors , 2021 .

[22]  Z. Xia,et al.  Cr3+‐Doped Sc‐Based Fluoride Enabling Highly Efficient Near Infrared Luminescence: A Case Study of K2NaScF6:Cr3+ , 2020, Laser & Photonics Reviews.

[23]  Fan Zhang,et al.  Recent progress in NIR-II emitting lanthanide-based nanoparticles and their biological applications , 2020 .

[24]  Jianqing Jiang,et al.  Enhancing Near-Infrared Photoluminescence Intensity and Spectral Properties in Yb3+ Codoped LiScP2O7:Cr3+ , 2020 .

[25]  Z. Song,et al.  Double perovskite Cs2AgInCl6:Cr3+: broadband and near-infrared luminescent materials , 2019, Inorganic Chemistry Frontiers.

[26]  Gerhard Abstreiter,et al.  GaAs–AlGaAs core–shell nanowire lasers on silicon: invited review , 2017 .

[27]  Hongjie Dai,et al.  Near-infrared fluorophores for biomedical imaging , 2017, Nature Biomedical Engineering.

[28]  Wolfgang Schnick,et al.  A revolution in lighting. , 2015, Nature materials.

[29]  V. Atuchin,et al.  Photoluminescence Tuning via Cation Substitution in Oxonitridosilicate Phosphors: DFT Calculations, Different Site Occupations, and Luminescence Mechanisms , 2014 .

[30]  Dolores Pérez-Marín,et al.  Non-destructive characterization and quality control of intact strawberries based on NIR spectral data , 2012 .

[31]  E. Schubert,et al.  Analytic model for the efficiency droop in semiconductors with asymmetric carrier-transport properties based on drift-induced reduction of injection efficiency , 2012 .

[32]  J. Bünzli,et al.  Lanthanide NIR luminescence for telecommunications, bioanalyses and solar energy conversion , 2010 .

[33]  Celine Valeria Liew,et al.  In-line quantification of micronized drug and excipients in tablets by near infrared (NIR) spectroscopy: Real time monitoring of tabletting process. , 2010, International journal of pharmaceutics.

[34]  G. Kresse,et al.  From ultrasoft pseudopotentials to the projector augmented-wave method , 1999 .

[35]  G. Kresse,et al.  Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set , 1996 .

[36]  L. K. Smith,et al.  Laser performance of LiSrAlF6:Cr3+ , 1989 .

[37]  S. Bhushan,et al.  Temperature dependent studies of cathodoluminescence of green band of ZnO crystals , 1988 .

[38]  Jialong Zhao,et al.  Efficient broadband near-infrared luminescence of Cr3+ doped fluoride K2NaInF6 and its NIR-LED application toward veins imaging , 2022 .

[39]  Z. Song,et al.  Tuning luminescence from NIR-I to NIR-II in Cr3+-doped olivine phosphors for nondestructive analysis , 2021 .

[40]  S. Adachi.  Review—Mn4+-Activated Red and Deep Red-Emitting Phosphors , 2019, ECS Journal of Solid State Science and Technology.