Broadband orange phosphor by energy transfer between Ce3+ and Mn2+ in Ca3Al2Ge3O12 garnet host

Site Occupation and Luminescence of Novel Orange-Red Ca3M2Ge3O12:Mn2+,Mn4+ (M = Al, Ga) Phosphors

“…In CMGO (M = Al, Ga) matrix, Ca 2+ coordinates with 8 O 2– to form a dodecahedron, Al 3+ /Ga 3+ coordinates with 6 O 2– to form an AlO 6 /GaO 6 octahedral, and Ge 4+ coordinates with 4 O 2– to form a tetrahedral. Considering ionic size and valence (Table S1), the doped manganese ions may occupy Ca 2+ and Al 3+ /Ga 3+ sites to form Mn 2+ color center or occupy Al 3+ /Ga 3+ sites to form Mn 4+ color center …”

“…Considering ionic size and valence (Table S1), the doped manganese ions may occupy Ca 2+ and Al 3+ /Ga 3+ sites to form Mn 2+ color center or occupy Al 3+ /Ga 3+ sites to form Mn 4+ color center. 32 Moreover, the SEM micrographs of CAGO host, MnCO 3related CAGO:Mn, MnO 2 -related CAGO:Mn, and CGGO:Mn samples are checked and are displayed in Figure S1. The samples crystallize well with slight agglomeration.…”

“…Compared with Eu 3+ -doped and nitride-based red phosphors, manganese-doped red phosphors have a series of advantages, such as great spectral characteristics, easy availability of starting materials with low price, and mild synthesis conditions. Manganese dopants are used as luminescent ions in many inorganic luminescent materials. − It is well-known that Mn 2+ dopants present broadband emission band, and its luminescent color depends on the matrix. − Generally, according to the dominant color of Mn 2+ emission, Mn 2+ -doped phosphors can be divided into two types. One is red or orange phosphors with large crystal field strength, and the other is green phosphors with smaller crystal field.…”

“…Furthermore, manganese-doped phosphors with excellent spectral properties avoid the high cost of rare earth. In view of these incomparable advantages, the researchers focused on investigating manganese-doped red-emitting phosphors, such as Y 3 Al 5 O 12 :Mn 2+ , Ca 3 Al 2 Ge 3 O 12 :Mn 2+ , K 2 TiF 6 :Mn 4+ , CaMg 2 Al 16 O 27 :Mn 4+ , and BaSiF 6 :Mn 4+ . However, the coexistence of Mn 2+ with orange light emission and Mn 4+ emitting red light phosphors has rarely been reported.…”

Study on Design, Synthesis and Controlled Color Emission of (Gd,Y)AG: Ce3+ Based Phosphors Through Replacing Al3+ Partly

“…5b shows the PL spectra of the (Gd,Y)3(Al1-2yMgySiy)5O12:Ce 3+ 0.01 (y = 0-0.4) phosphors under the optimal excitation wavelength. [33][34][35] Under the optimal excitation wavelength at 469 nm, the optimal emission wavelength of the (Gd,Y)AG:Ce 3+ 0.01 phosphor displays a broadband emission at ~575 nm, which originates from the 5d-4f transition of Ce 3+ . Similarly, monitoring at the optimal excitation wavelengths of these phosphors, the emission intensities of the (Gd,Y)3(Al1-2yMgySiy)5O12:Ce 3+ 0.01 (y = 0-0.4) phosphors decrease as the concentration of Mg 2+ /Si 4+ increasing.…”