A highly efficient and suitable spectral profile Cr3+-doped garnet near-infrared emitting phosphor for regulating photomorphogenesis of plants

Efficient broadband near-infrared emission induced by Nb5+ substitution for Ta5+ in GaTa1−yNbyO4:Cr3+ phosphor

“…Near-infrared (NIR) light sources are widely used in the fields of food testing, biological tissue analysis, medical care, night vision and agriculture. [1][2][3][4][5] Due to their small size, broad emission, long life and low cost, NIR phosphor-converted LEDs ( pc-LEDs) are the most promising next-generation smart NIR light source. In order to develop an efficient broadband NIR phosphor for pc-LEDs, it is particularly important to select a suitable activator ion.…”

A broadband near‐infrared Sc1−x(PO3)3:XCr3+ phosphor with enhanced thermal stability and quantum yield by Yb3+ codoping

“…[5][6][7] To solve the inherent problems of current NIR light sources, a possible solution has been proposed via designing the broadband NIR phosphors converted LEDs (pc-LEDs), which is the combination of well-established blue-emitting chips and broadband NIR phosphors. 8,9 Similar to the white pc-LEDs, the broadband NIR phosphors are the vital component of NIR pc-LED devices, and even determine the device performance. 10,11 Compared to the lanthanide ions (Nd 3+ , Yb 3+ , Er 3+ , Tm 3+ ), Cr 3+ ion can be served as a preferable NIR emitter, because it has a broadband absorption in the visible region (well matched with the blue-emitting chips), and an intense sharp-line emission (typically located around 690 nm) from the 2 E→ 4 A 2 transition in a strong crystal field, or a broadband emission from the 4 T 2g (4 F)→ 4 A 2 transition in a weak crystal field.…”

“…This is a non‐invasive and real‐time monitoring tool in food analysis and medical diagnostics, which demands for a broad bandwidth besides the above advantages 5–7 . To solve the inherent problems of current NIR light sources, a possible solution has been proposed via designing the broadband NIR phosphors converted LEDs (pc‐LEDs), which is the combination of well‐established blue‐emitting chips and broadband NIR phosphors 8,9 . Similar to the white pc‐LEDs, the broadband NIR phosphors are the vital component of NIR pc‐LED devices, and even determine the device performance 10,11 …”

“…For the Sc(PO 3 ) 3 host the average bond lengths of Sc-O are 2.104(7), 2.105(1), and 2.106(7) Å for Sc(1)O 6 , Sc(2)O 6 , and Sc(3)O 6 octahedra, respectively (see Figure1B). Upon doping with Cr 3+ , the calculated average bond lengths of Sc-O for Sc 0.90 (PO 3 ) 3 :0.10Cr 3+ are 2.076(6), 2.163(5), and 2.111(8) for Sc(1)O 6 , Sc(2)O 6 , and Sc(3)O 6 Å octahedra, respectively. Some replacement of Sc 3+ ions (𝑟 𝑆𝑐 3+ = 0.745 Å, CN = 6) by smaller Cr 3+F I G U R E 1 (A) Crystal structure of Sc(PO 3 ) 3 on the ac plane with ScO 6 octahedra and PO 4 tetrahedra; (B) three distinct ScO 6 octahedra along the b-axis; (C) XRD patterns of Sc 1−x (PO 3 ) 3 : xCr 3+ (x = 0, 0.005, 0.01, 0.05, 0.10) phosphors and PDF card of Sc(PO 3 ) 3 (72-2160) as the standard reference; (D) experimental (solid dot), calculated (red solid line), Bragg positions (blue short line), and differences (black solid line) results of Rietveld refinement of Sc 0.90 (PO 3 ) 3 : 0.10Cr 3+ at room temperature ions (𝑟 𝐶𝑟 3+ = 0.615 Å, CN = 6) may be responsible for the decreased average bond lengths of Sc(1)O 6 octahedron.…”

Novel deep‐red‐emitting double‐perovskite type Ca2ScNbO6:Mn4+ phosphor: Structure, spectral study, and improvement by NaF flux

“…2,3 Compared with conventional high-pressure sodium (HPS) lamps, phosphor-convert light-emitting diodes (pc-LEDs) offer multiple advantages for the application in plant growth lighting such as energy saving, longevity, non-toxic, resistance to humidity, and tunable wavelength, which was enabled from the multiplicity of phosphors. [4][5][6][7] Numerous efforts have been devoted to develop new phosphors for the pursuit of optimal light recipes for plant growth. As is known, the role of light in plant growth varies with wavelength.…”