Optical spectroscopy of the Sr₄Al₁₄O₂₅:Mn⁴⁺,Cr³⁺ phosphor: pressure and temperature dependences

Abstract

We present a spectroscopic study of the doubly Mn4+ and Cr3+-doped Sr4Al14O25, synthesised via solid state reaction, as a function of pressure and temperature to check its potential as a...

An Al3+-incorporated Ca2LuNbO6:Mn4+ oxide phosphor with dramatic deep-red and far-red emission bands

“…The spectral features of Mn 4+ ions are a result of their unique 3d 3 electronic structure, which exhibits a wide excitation band ranging from 200 to 600 nm and an emission band ranging from 620 to 720 nm. 9–11 In recent years, a variety of Mn 4+ -activated oxide and fluoride phosphors have been reported, including (Rb, K) 2 Ge 4 O 9 :Mn 4+ (660 nm), 12 Mg 2 TiO 4 :Mn 4+ (660 nm), 13 (Zn x Mg 1− x ) 2 TiO 4 :Mn 4+ (674 nm), 14 Mg 2 Ti 1− x Mn x O 4 (680 nm), 15 NaLiTi 3 O 7 :Mn 4+ (681 nm), 16 Li 3 RbGe 8 O 18 :Mn 4+ (667 nm), 17 Sr 3 Al 10 SiO 20 :Mn 4+ (662 nm), 18 Sr 4 Al 14 O 25 :Mn 4+ (652 nm), 19 Lu 3 Al 5 O 12 :Mn 4+ (668 nm), 20 K 2 TiF 6 :Mn 4+ (630 nm), 21 K 2 LiInF 6 :Mn 4+ (630 nm), 22 and BaSi 1− x Ge x F 6 :Mn 4+ (630 nm). 23 The emission peaks of Mn 4+ in fluorides are mainly located below 650 nm, whereas the emission peaks of Mn 4+ in oxides typically range from 650 to 700 nm.…”

Evaluation of Li2SnO3:Cr3+, Mn4+ as a dual-emitter luminescence sensor for cryogenic temperatures

“…To date only characteristic sharp emission peaks due to spin-forbidden transitions 2 E -4 A 2 of Cr 3+ and Mn 4+ have been reported in several hosts, indicating that both ions are experiencing a strong crystal field effect. [9][10][11][12][13] It should be noted that such materials with two types of emission centers are particularly interesting for application as multimodal luminescence sensors of temperature. 14 The dualemitter sensor allows to extend the temperature range of operation and improves the reliability of the technique.…”