Optical spectroscopy of La3Ga5SiO14 disordered crystals doped with Fe3+ ions

Tetracoordinate Fe3+ Activated Li2ZnAO4 (A = Si, Ge) Near-Infrared Luminescent Phosphors

“…To better understand the optical properties of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ phosphor, the Tanabe–Sugano diagram of Fe 3+ in a tetrahedral environment is used, as shown in Figure f . The crystal field strength of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ can be calculated using the formulas –: E ( A 1 6 → E 4 false( normalD 0.25em 4 false) ) B = 5 C B + 17 E ( A 1 6 → T 2 4 false( normalD 0.25em 4 false) ) B ≈ 5 C B + 13 + ε E ( A 1 6 → E , A 1 4…”

“…To better understand the optical properties of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ phosphor, the Tanabe–Sugano diagram of Fe 3+ in a tetrahedral environment is used, as shown in Figure f . The crystal field strength of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ can be calculated using the formulas –: where D q is the intensity coefficient of the crystal field; E ( 6 A 1 → 4 E­( 4 D)), E ( 6 A 1 → 4 T 2 ( 4 D)), E ( 6 A 1 → 4 E, 4 A 1 ( 4 G)), and E ( 6 A 1 → 4 T 2 ( 4 G)) are the corresponding 6 A 1 → 4 E­( 4 D), 6 A 1 → 4 E, 4 A 1 ( 4 G), and 6 A 1 → 4 T 2 ( 4 G) transition energies of the Fe 3+ ion in the excitation spectrum, respectively, and the unit is the wavenumber (cm –1 ); and B is the Racah parameter.…”

“…To better understand the optical properties of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ phosphor, the Tanabe−Sugano diagram of Fe 3+ in a tetrahedral environment is used, as shown in Figure 3f. 27 The crystal field strength of Li 2 ZnAO 4 (A = Si, Ge): Fe 3+ can be calculated using the formulas 6−9: 28 where D q is the intensity coefficient of the crystal field;…”

A low-temperature self-flux route to prepare hexagonal rare earth fluorides and manipulation of upconversion luminescence in rodlike NaYbF4:Tm3+/Fe3+ crystals

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Recently, Fe 3+ doping has attracted increasing interest based on the following aspects. [14][15][16][17][18][19][20][21][22] First and foremost, Fe 3+ is a low-cost, nontoxic and harmless trivalent non-rare-earth metal ion, which gives it considerable appeal in a great number of areas including energy storage, quantum information processing, classic data storage, magnetic resonance imaging and spin-controlled reactions. There is one more point, and most importantly, the substitution of Fe 3+ for Yb 3+ can induce a change in the local crystal lattice field around rare earth ions stemming from the difference in the ionic radii of Fe 3+ and Yb 3+ , as expected, enhancing the f-f radiative transition rates and their UC emissions.…”