Efficient and ultra-broadband Cr³⁺/Ni²⁺ co-doped phosphors for light-emitting diodes with spectral output over NIR-I and NIR-II regions

Abstract

Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) technology has attracted intense attention to build next-generation broadband NIR light sources. Simultaneous achievements of ultra-broadband emission and high luminescent efficiency remain a great...

Plastic Identification by Using Energy Transfer Enhanced Broadband Short-Wave Infrared Phosphor Mg3Ga2GeO8:Cr3+, Ni2+

“…Several distinct absorption bands can be observed at the SWIR range 1,100–1,700 nm, owing to the carbon–hydrogen (C–H) and oxygen–hydrogen (O–H) vibration overtones. This result is also consistent with the results of the related previous studies. − The detailed information about the absorption bands is presented in Table S2. Due to the difference in these absorption bands, we can identify types of plastic easily.…”

Highly efficient and thermostable far-red phosphor for promoting root growth in plants

“…3b and c also shows that varying the concentration ratio of Sm 3+ and Cr 3+ can tune the spectra from orange-red to far-red, this expands the application scope in the field of plant lighting. Regulation luminescence via the introduction of other activator ions has also been reported in other systems, such as Gd 2 MgTiO 6 :Bi 3+ , Cr 3+ ; 46 Gd 3 Mg 0.5 Al 1.5 Ga 2.5 Ge 0.5 O 12 :Cr 3+ , Yb 3+ , Ni 2+ ; 47 Ca 14 Al 10 Zn 6 O 35 :Ti 4+ , Mn 4+ 48 and MgGa 2 (O, F) 4 :Cr 3+ , Ni 2+ . 49…”

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

“…Under 390 nm light excitation, the emission spectrum of Ni 2+ -doped MgAl 2 O 4 phosphors covers 900−1600 nm, the half-peak width is 251 nm, and the peak position is located at 1230 nm, which is derived from the 3 T 2 (F) → 3 A 2 (F) electronic transition of Ni 2+ ions, as shown in Figure 4d. 50 According to the previous study, the optimal doping content of Ni 2+ in the Ni 2+ -doped MgAl 2 O 4 spinel phosphor prepared by the sol−gel sintering method is 1.5 mol %, so this Ni 2+ doping content was adopted. Here, we studied the effect of the amount of the charge compensator Zr 4+ on the luminescence performance of NIR phosphors.…”

“…As shown in Figure c, when monitoring at 1230 nm, the observed excitation spectra of MAO-2.0Zr at 390 and 610 nm belong to the spin-allowed electronic transitions of 3 A 2 (F) → 3 T 1 (P) and 3 A 2 (F) → 3 T 1 (F), while the weaker excitation bands observed at 470 nm belong to the spin prohibitive transitions of 3 A 2 (F) → 1 T 2 (D), indicating that Ni 2+ -doped MgAl 2 O 4 phosphors can be excited by lights with a broad wavelength range from ultraviolet to red light. Under 390 nm light excitation, the emission spectrum of Ni 2+ -doped MgAl 2 O 4 phosphors covers 900–1600 nm, the half-peak width is 251 nm, and the peak position is located at 1230 nm, which is derived from the 3 T 2 (F) → 3 A 2 (F) electronic transition of Ni 2+ ions, as shown in Figure d . According to the previous study, the optimal doping content of Ni 2+ in the Ni 2+ -doped MgAl 2 O 4 spinel phosphor prepared by the sol–gel sintering method is 1.5 mol %, so this Ni 2+ doping content was adopted.…”