Design, luminescence properties and applications of Cr³⁺-doped ScTaO₄: a broadband near-infrared phosphor

Abstract

Near infrared (NIR) emitting LED devices have broad applications. Using visible light LED chip to excite Cr3+ activated phosphor to obtain NIR light has attracted extensive attention. In this paper,...

Broadband short-wave infrared Mg4Nb2O9:Cr3+,Li+ phosphor for nondestructive safety detection and biomedical imaging

“…Note that the thermal stability of the Mg 4 Nb 2 O 9 :3%Cr 3+ ,Li + sample is inferior to that of the Mg 4 Ta 2 O 9 :3%Cr 3+ ,Li + starlet, as reported by Tang et al (58.4%@373 K) and Wang et al (55%@373 K), 36,37 but comparable to many previously claimed results of tantalate, [48][49][50] niobate, 51 as well as systems with PL peak more than 850 nm, [52][53][54][55] such as ZnTa 2 O 6 :4%Cr 3+ (peak B935 nm, about 49%@373 K), ScTaO 4 :Cr 3+ (peak B940 nm, about 16%@373 K), InTaO 4 :4%Cr 3+ (peak B880 nm, about 23%@360 K), GaTa 0.5 Nb 0.5 O 4 :2.5%Cr 3+ (peak B865 nm, 55.2%@ 450 K), LiScP 2 O 7 :Cr 3+ (peak B880 nm, 41% at 373 K), Li 3 Sc 2 -(PO 4 ) 3 :Cr 3+ (peak B978 nm, 37%@373 K), LiIn 2 SbO 6 :Cr 3+ (peak B970 nm, 10%@368 K), and Cs 2 AgInCl 6 :Cr 3+ (peak B1010 nm, o 10%@373 K). All comparable parameters and results are summarized in Table S5 (ESI †).…”

A novel Mn2+ doped ScTaO4 dual-emitting phosphor for high temperature optical thermometry

“…Phase purity and crystal structure STO has been extensively reported to belong to a monoclinic system with two phases: for the low temperature M 0 phase, space group P2/ c, and for the high temperature phase M, space group I2/a. 32,33 As can be seen from the XRD results of STO:xMn 2+ (x = 0-0.009) phosphors in Fig. 1a, the Bragg reflection of all samples is well indexed to the standard powder diffraction file (PDF#24-1017), confirming that the synthesized STO belongs to the M 0 phase.…”

“…It can be inferred that the absorption bands shorter than 250 nm belong to intrinsic absorption of the host, while that at 250-400 nm is attributed to the Ta 5+ -O 2À charge transfer of [TaO 6 ] groups in the host. 32 When Mn 2+ ions are introduced in the host, an additional absorption band located at 350-550 nm was observed. It can be inferred that the additional absorption band is assigned to the intra-3d shell absorption transition of Mn 2+ .…”

Broadband short-wave near-infrared-emitting phosphor MgNb2O6:Cr3+ for pc-LED applications

“…good thermal stability of the MgNb 2 O 6 :Cr 3+ phosphor samples (see comparisons in Table 1). 32,42,47,48,50 The simplified configurational coordinate diagram (Fig. S7 †) illustrates the thermal quenching behavior of the MgNb 2 O 6 :1%Cr 3+ sample.…”