Sol–gel preparation of a new compound with Ca3Ga2Ge4O14 structure: La3Al5.5Ta0.5O14

Ultra-broadband near-infrared luminescence of ordered–disordered multi-sited Cr3+ in La3Ga5.5Nb0.5O14:Cr3+

“…The Ca-gallogermanate family (space group P321) features the layered crystal structure and various disordered sites. [10][11][12][13][14][15][16][17] Previous reports of Cr 3+ -doped materials with analogous Cagallogermanate structure (Ca 3 Ga 2 Ge 4 O 14 , Sr 3 Ca 2 Ge 4 O 14 , La 3 Ga 5 GeO 14 , La 3 Ga 5 SiO 14 ) showed that Cr 3+ ions would experience disorder-induced distributions of strong and weak crystal eld strengths, resulting in two types of luminescence being observed: sharp R-line (600-700 nm) and broad NIR (900-1300 nm) emissions. 10,18,19 Therefore, controlling the order-disorder structure is the key to tune and achieve the broadband NIR emission.…”

Luminescence of Eu-doped langanite nanopowders synthesized by a citrate sol–gel method

“…Such a method, involving lower temperature synthesis, is the sol-gel approach. There are only few papers regarding the sol-gel synthesis of LGX compounds [8][9][10][11][12] and only one (in our best knowledge) concerning Eu-doped nanopowder (Eu-doped LGN) [9]. In Ref.…”