Broadband near-infrared (NIR) emission realized by the crystal-field engineering of Y_3−xCa_xAl_5−xSi_xO₁₂:Cr³⁺(x= 0–2.0) garnet phosphors

Abstract

Broadband NIR emission with high IQE was realized by crystal-field engineering of Y2CaAl4SiO12:Cr.

Efficient near‐infrared pyroxene phosphor LiInGe2O6:Cr3+for NIR spectroscopy application

“…It is well known that Cr 3+ ion is an ideal activator to achieve broad‐band NIR emission. When Cr 3+ ions take over octahedral sites, its emission can be largely tuned by the surrounding coordination environments 15,16 . Especially in the weak octahedral crystal field, a broadband luminescence originating from the spin‐allowed 4 T 2 ( 4 F) → 4 A 2 transition could be obtained.…”

The hydrothermally synthesis of K3AlF6:Cr3+ NIR phosphor and its performance optimization based on phase control

“…[15][16][17][18] One strategy is to employ transition-mental ions, Cr 3+ for instance. [19][20][21] The main hosts for Cr 3+ -doped NIR phosphor are germanate, [22][23][24][25][26][27] silicate, [28][29][30][31][32] phosphate, [33][34][35] and borate. [36][37][38][39] The synthesis of these phosphors requires calcination at a temperature of 800-1600°C, which results in high production costs.…”

Simultaneous Broadening and Enhancement of Cr3+Photoluminescence in LiIn2SbO6by Chemical Unit Cosubstitution: Night‐Vision and Near‐Infrared Spectroscopy Detection Applications

“…However, their emission bands are not sufficiently broad. Although garnet has a flexible crystal structure that allows structural adjustment, it is difficult to tune the emission wavelength of Cr 3+ [7d] . Therefore, new hosts are desirable for Cr 3+ doping and NIR‐emission tuning.…”