An efficient garnet-structured Na3Al2Li3F12:Cr3+ phosphor with excellent photoluminescence thermal stability for near-infrared LEDs

Efficient and thermally stable broadband near-infrared emission from near zero thermal expansion AlP3O9:Cr3+phosphors

“…[10][11][12] Moreover, the excitation bands of Cr 3+ ions are usually located at the blue and red spectral regions, and match well with the emissions of low-cost commercial diode chips. Hence, numerous studies on Cr 3+ -activated phosphors have been reported for NIR pc-LED applications, such as Cr 3+ -doped garnets (X 3 M 2 A 3 O 12 , X = La, Lu, Y, Gd; M = Zr, Hf, Ga; A = Al, Si, Ge), [13][14][15] gallogermanates (La 3 Ga 5 GeO 14 , LaMgGa 11 O 19 ), 16,17 borates [ScBO 3 , GdAl 3 (BO 3 ) 4 ], 18,19 fluorides (Na 3 ScF 6 , Na 3 Al 2 Li 3 F 12 ), [20][21][22] etc. However, NIR phosphors that fulfil all commercial standards, including strong absorption of excitation light, high emission efficiency, and excellent chemical and PL thermal stability, are still very limited.…”

Highly efficient and thermally stable broadband near-infrared emitting fluoride Cs2KGaF6:Cr3+ for multiple LED applications

“…To date, a few Cr 3+ doped fluorides have been reported, such as Na 3 ScF 6 :Cr 3+ , K 2 NaScF 6 :Cr 3+ , Na 3 Al 2 Li 3 F 12 :Cr 3+ , etc. 28–30 Among them, K 2 NaScF 6 :Cr 3+ generates broadband NIR emission within 600–1000 nm and exhibits excellent thermal stability with a high I 150 °C value of 89.6%. Meanwhile, it also shows a considerable IQE of 74%.…”

Cr3+-Doped double perovskite antimonates: efficient and tunable phosphors from NIR-I to NIR-II

“…1 summarizes the available data on internal/external quantum efficiency and luminescence thermal stability of reported Cr 3+ -doped NIR luminescent materials. 9–31 It can be seen that there exists a trade-off between the long emission wavelength and the luminescence thermal stability. So, it is quite challenging to find new broadband NIR phosphors with a long emission wavelength, high luminescence efficiency and excellent luminescence thermal stability.…”