A High-efficiency blue-LED-excitable NIR-II-emitting MgO:Cr3+,Ni2+ phosphor for future broadband light source toward multifunctional NIR spectroscopy applications

Unraveling Luminescent Energy Transfer Pathways: Futuristic Approach of Miniature Shortwave Infrared Light-Emitting Diode Design

“…A shortwave infrared light (SWIR, 900–1700 nm) source in a compact size and operable with battery power is a critical need for delivering exciting answers to a wide range of spectroscopy, night surveillance, anticounterfeiting, solar cells, and bioimaging applications. − The phosphor-converted light-emitting diode (pc-LED) based on energy downshifting converter technology has been pursued as a promising energy device for infrared light and also an alternative to the well-known conventional SWIR light devices. , For example, pc-white LEDs have already revolutionized lighting and backlighting technologies by saving energy and trimming the device size, , and pc-LED devices based on Cr 3+ - and Eu 2+ -activated inorganic phosphors can emit near-infrared light around 600–1100 nm. − Obtaining emissions beyond 1100 nm using Cr 3+ , Bi 3+ , or Eu 2+ is difficult, while La 3 Ga 5 GeO 14 :Cr 3+ is the only reported super broadband (650–1200 nm) near-infrared phosphor, and its practical applications are limited. ,,, Thus, the development of SWIR-emitting luminous inorganic phosphors is a vital and urgent task.…”

Designing and controlling the Ni2+-activated (Zn, Mg)Al2O4 spinel solid-solution for phosphor-converted broadband near-infrared illumination

“…When we plotted the crystal field strength of the position occupied by the Ni 2+ ion in the coordination environment in the Tanabe-Sugano energy configuration, the resulting corresponding electron transition position of each energy level was obtained. 46,47 As the x-value increases, the crystal field splitting energy and crystal field strength gradually increase, the energy level spacing decreases and the Stokes displacement becomes larger for the 6-coordination Ni 2+ ions in the continuous solid melt phosphor. Fig.…”

Shortwave Infrared Luminescence of Tetravalent Chromium and Divalent Nickel: Phosphor Design Principles and Applications

“…λ exc = excitation wavelength. (b) Reprinted with permission from ref . Copyright 2023 Elsevier B.V.…”

“…The pc-LED light device with SWIR emissions is more useful for studying the vibration and overtone combinations of the basic bonds (O–H, C–H, and N–H) in the organic components. Liu et al demonstrated the usefulness of SWIR emissions from the MgO:Cr 3+ ,Ni 2+ phosphor under 455 nm xenon lamp excitation by measuring the absorption spectra of organic components such as H 2 O, CH 3 OH, C 2 H 5 OH, C 7 H 8 , and C 6 H 12 . Even chemometric analysis and differentiation of two different organic solutions are possible by constructing a proper regression model (Figure a,b).…”