Synthesis and luminescence of novel near‐infrared emitting BaZrSi₃O₉:Cr³⁺ phosphors

Abstract

The BaZrSi O :Cr phosphors were prepared by a high temperature solid state method. Their structures were confirmed with XRD and their luminescence properties were investigated. Under excitation at 455 nm, BaZrSi O :Cr phosphors exhibited a broad near infrared emission band peaked at 800 nm, which was assigned to the T → A transition of Cr . The near infrared emission intensity reached a maximum at Cr concentration of 0.7%. There was a concentration quenching phenomenon of Cr in BaZrSi O matrix and the corresponding concentration quenching mechanism was investigated. With efficient near infrared emission in the range of 700-1000 nm, BaZrSi O :Cr phosphors may find applications in solar energy conversion.

Improving and broadening luminescence in Gd2−xAlxGaSbO7:Cr3+ phosphors for NIR LED applications

“…6 Moreover, Cr 3+ provides strong blue absorption, [16][17][18] which can be effectively stimulated by commercial blue chips. Consequently, extensive efforts have been devoted to exploring Cr 3+ -doped NIR phosphors, such as, Y 3 Al 5−x Ga x O 12 :Cr 3+ , 20 ZnGa 2 O 4 :Cr 3+ , 21 BaZrSi 3 O 9 :Cr 3+ , 22 ScBO 3 :Cr 3+ , 23 La 2 MgZrO 6 : Cr 3+ , 24 Gd 3 Sc 2 Ga 3 O 12 :Cr 3+ , 25 Na 3 Al 2 Li 3 F 12 :Cr 3+26 and Gd 3 Zn x Ga 5−2x Ge x O 12 :Cr 3+ . 27 However, developing high-performing Cr 3+ -incorporated materials with highly efficient broadband NIR luminescence and superior thermal stability that meet the requirements of commercial applications is still an immense challenge.…”

A new broadband near-infrared emitting Mg2Al4Si5O18:Cr3+ phosphor for night-vision imaging

“…In view of this, silicatebased phosphors have garnered considerable interest due to their cost-effectiveness, high physical and chemical stability, good heat resistance and so on. [22][23][24][25] Polycrystalline Mg 2 Al 4 Si 5 O 18 , as a silicate compound, is a low-symmetry orthorhombic phase with a hexagonal structure of multiple hexagonal rings. 26 Its loose structure enables Mg 2+ , Al 3+ , and Si 4+ to be easily replaced by other ions of comparable size.…”

Design of a Broadband NIR Phosphor for Security-Monitoring LEDs: Tunable Photoluminescence Properties and Enhanced Thermal Stability

“…Broadband near-infrared (NIR) light sources are receiving increasing interest to meet the requirements of active infrared security-monitoring applications like night-vision technology. − When NIR radiation passes through objects, the light may be reflected or absorbed by different kinds of objects . The reflected NIR light can be received by infrared night-vision cameras; consequently, this will provide dedicated surveillance and security systems all day and all night.…”

“…So far, Cr 3+ -doped NIR phosphors mainly include aluminate, , gallogermanate, , silicate, and stannate . Aside from that, the borate phosphor, with high chemical stability, low synthesis temperature, abundant raw material, nontoxicity, and low cost, has been explored as another promising candidate host to achieve interesting luminescence properties after Cr 3+ incorporation.…”