Luminescence properties of the pink emitting persistent phosphor Pr³⁺-doped La₃GaGe₅O₁₆

Abstract

The pink persistent phosphor La3GaGe5O16:Pr3+ was prepared successfully via a traditional solid state reaction method.

Ultra-Broadband Phosphors Converted Near-Infrared Light Emitting Diode with Efficient Radiant Power for Spectroscopy Applications

“…In order to enhance the radiant power of the prototype pc-NIR LED, the crystallographic sites of La 3+ and Ge 4+ in La 3 GaGe 5 O 16 are chemically substituted with the similar valence and bigger ionic size atoms of Gd 3+ and Sn 4+ , respectively, for inducing a much weaker crystal field environment to Cr 3+ , which in turn can enhance the radiant power and broadband luminescence efficiently. Initially, La 3 GaGe 5 O 16 is initially studied for solar cells, persistent luminescence, and warm white LED applications by employing a low sensitivity photodetector (250–900 nm), and the crystal structure is also not characterized in any of the previous studies. − As per previous reports and standard crystallographic databases (ICSD 50521), the crystal structure of La 3 GaGe 5 O 16 has a tetrahedrally coordinated Ga site for the luminescence of Cr 3+ ion, which is a very unusual luminescence observation and also not discussed in any of the reports. Inspired by this atypical Cr 3+ luminescence and lack of reports for broadband pc-NIR LED application, we decided to investigate the crystal structure of La 3 GaGe 5 O 16 for the actual luminescence mechanism of Cr 3+ in detail.…”

The World Needs New Colors: Cutting Edge Mobility Focusing on Long Persistent Luminescence Materials

“…These are sold under the name LumiNova®: for example, SrAl 2 O 4 :Eu 2+ ,Dy 3+ =green . Currently, many other examples of green and blue emitting Eu 2+ (green/blue), Tb 3+ , Ce 3+ (blue), Mn 2+ or Tm 3+ doped and long persistent luminophores with crystal defects (blue) are reported. In Figure are several probes of green, blue and bluish white long persistent luminescence emitters shown.…”

Development of deep red–emitting CaBiVO5:Pr3+ phosphor for multifunctional optoelectronic applications

“…The emission spectra reveals various sharp bands located at 533, 547, 583, 608, 620, 656, 680, and 693 nm attributed to 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 , 3 P 1 → 3 H 6 , 1 D 2 → 3 H 4 , 3 P 0 → 3 H 6 , 3 P 0 → 3 F 2 , 3 P 0 → 3 F 3 , and 1 D 2 → 3 H 5 transitions of Pr 3+ ions, respectively. [37][38][39][40][41][42][43] The emission peak located at 608 nm ( 1 D 2 → 3 H 4 ) dominates among all the peaks present in the emission spectra. In the present case, there is a possibility of inhomogeneous crystal field and low symmetry around Pr 3+ ions, which may be ascribed to minute Ca/Bi disordered ratio in the CBV lattice structure.…”

“…The evaluated value of R c is far greater than 5 Å (required for exchange interaction to Subsequently, energy transfer can only be considered via multipolar interaction. The mentioned interaction between activators ions can possibly be of electric dipolar-dipolar (dd), dipolar-quadrupolar (d-q), and quadrupolar-quadrupolar (q-q) type, and determined by the below stated equation 41 :…”