A new approach for measurement of Cr4+ concentration in Cr4+:YAG transparent materials: Some conceptual difficulties and possible solutions

Crystal-Field Strength Variations and Energy Transfer in Cr3+-Doped GGG Transparent Nanoceramics

“…A detailed description of the function and methodology can be found in our earlier paper. 10 The mismatch between the fitted and experimental curves is clearly visible, indicating the presence of more than two excitation bands. The possible explanation of this effect is the presence of weak 4…”

“…The peak parameters are shown in Figure S3 and Table S2. It should be noted that excitation and emission bands were fitted by the log-normal function, 10 which can be described by eq 1…”

Broadband NIR luminescence of Cr3+-doped Mg4Nb2O9 phosphors toward LED light source applications for NIR spectrometry

“…The absorption bands of Cr 4+ in octahedral sites are located at 482, 406, and 361 nm. 38) For several oxide materials, including Cr 6+ , the absorption bands due to a charge transfer phenomenon between Cr 6+ and O 2− appear in 300-400 nm. 39) In Fig.…”

Synthesis and luminescence properties of Cr2O3-CaO-GeO2 glass and glass ceramics for broadband NIR-LEDs

“…25,26) The P4 band appears at 2.40 eV, corresponding to the 3 T 1 → 3 T 2 transition of Cr 4+ in the octahedral coordination sites. 36,37) With the increase of the annealing temperature from 775 °C to 800 °C, the value of F(R ∞ ) of the P4 band compared to the P3 and P5 bands relatively increased. This result suggests that some Cr 3+ is oxidized to Cr 4+ as the Ca 2 Ge 7 O 16 crystal grows.…”