Highly efficient and thermally stable broadband near-infrared emitting garnet Ca₃Sc₂Ge₃O₁₂:Cr³⁺,Ce³⁺ phosphors for multiple pc-LED applications

Abstract

With the increasing application demand of near-infrared (NIR) spectroscopy in security, agriculture, medical and other fields, people have been pursuing efficient and intelligent NIR light sources. Herein, Cr3+ doped Ca3Sc2Ge3O12...

Two-Site Occupation for Constructing Double Perovskite BaLaMgNbO6:Cr3+ Ultrabroadband NIR Phosphors

“…Simultaneously, as the concentration of Cr 3+ increases, a pronounced red shift in emission is observed (Figure d,e), attributed to reabsorption resulting from the spectral overlap between excitation and emission spectra (Figure b). It is worth noting that a large number of previously reported emission wavelengths of Cr 3+ -activated NIR phosphors are below 800 nm and the coverage range is only 650–1100 nm, such as Ca 3 Sc 2 Ge 3 O 12 :Cr 3+ (λ max = 785 nm) and MgGa 2 O 4 :Cr 3+ (λ max = 709 nm), so the luminescence mechanism of BLMN:Cr 3+ phosphors with long wavelength emission needs to be further explored.…”

“…As shown in Figure a, due to the cross between 4 T 2 and 4 A 2 energy levels, the higher the temperature, the more favorable it is for the excited electrons to cross the barrier (Δ E ) and return to the ground state in the form of nonradiative transition. The activation energy (Δ E ) serves as a crucial parameter for assessing the thermal quenching resistance of fluorescent materials, and it can be determined using the subsequent formula: I t = I 0 1 + A e false( − Δ E / k T false) …”

Composition–structure–luminescence and enhancement of Cr3+ activated broadband near infrared phosphors for night vision, bio-imaging, and noninvasive detection

“…5c), which is relatively lower than other reported Cr 3+ -activated phosphors. 64–68 The low value of S refers to a weak electron–phonon coupling and small lattice relaxation. 68 Besides, the Yb 3+ co-doping also brings about higher luminescence thermal stability.…”

Efficient and stable near-infrared Y2Mg2Al2Si2O12:Cr3+ phosphor: analysis of the luminescence source by a site elimination strategy

“…[1][2][3][4][5][6] In particular, NIR light in the 700-1100 nm region is known as the first biological window, which can be used in bio-imaging and non-destructive testing due to its considerable penetration depth in biological tissues besides plant growth and night vision application. [7][8][9] Traditional NIR light sources such as incandescent lamps and halogen lamps have a series of problems like large size, low output, and high energy consumption, which hinder the further development of portable and integrated NIR technology. And the GaAs(Al/In)-based NIR LEDs are more competitive with the advantages of high efficiency and long lifetime.…”